./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/rew.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/rew.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a4dbd52ad78119a422ea606f98f820bbe5495fb5a7cf8886c665da2d1f9b569e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:32:56,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:32:56,943 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:32:56,975 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:32:56,975 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:32:56,977 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:32:56,980 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:32:56,982 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:32:56,985 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:32:56,986 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:32:56,987 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:32:56,989 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:32:56,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:32:57,001 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:32:57,003 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:32:57,005 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:32:57,006 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:32:57,007 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:32:57,014 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:32:57,025 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:32:57,028 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:32:57,033 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:32:57,034 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:32:57,035 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:32:57,046 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:32:57,046 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:32:57,047 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:32:57,049 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:32:57,049 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:32:57,054 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:32:57,055 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:32:57,056 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:32:57,058 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:32:57,059 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:32:57,061 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:32:57,061 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:32:57,062 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:32:57,062 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:32:57,062 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:32:57,063 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:32:57,064 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:32:57,065 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:32:57,112 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:32:57,113 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:32:57,113 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:32:57,113 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:32:57,115 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:32:57,115 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:32:57,115 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:32:57,115 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:32:57,116 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:32:57,116 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:32:57,117 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:32:57,117 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:32:57,117 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:32:57,117 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:32:57,118 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:32:57,118 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:32:57,118 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:32:57,118 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:32:57,120 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:32:57,120 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:32:57,120 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:32:57,120 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:32:57,120 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:32:57,121 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:32:57,121 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:32:57,121 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:32:57,122 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:32:57,123 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:32:57,123 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:32:57,123 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:32:57,123 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:32:57,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:32:57,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:57,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:32:57,124 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:32:57,125 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:32:57,125 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:32:57,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:32:57,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:32:57,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:32:57,126 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:32:57,126 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_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a4dbd52ad78119a422ea606f98f820bbe5495fb5a7cf8886c665da2d1f9b569e [2021-11-20 23:32:57,421 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:32:57,447 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:32:57,449 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:32:57,450 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:32:57,451 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:32:57,452 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-tiling/rew.c [2021-11-20 23:32:57,524 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/data/af1bf8920/6ad916d077074daca8ec11b99343c549/FLAGbef795e7e [2021-11-20 23:32:58,057 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:32:58,059 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/sv-benchmarks/c/array-tiling/rew.c [2021-11-20 23:32:58,071 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/data/af1bf8920/6ad916d077074daca8ec11b99343c549/FLAGbef795e7e [2021-11-20 23:32:58,442 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/data/af1bf8920/6ad916d077074daca8ec11b99343c549 [2021-11-20 23:32:58,445 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:32:58,448 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:32:58,451 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:58,451 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:32:58,454 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:32:58,455 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,456 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71bbd4fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58, skipping insertion in model container [2021-11-20 23:32:58,457 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,464 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:32:58,481 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:32:58,653 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_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/sv-benchmarks/c/array-tiling/rew.c[394,407] [2021-11-20 23:32:58,675 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:58,681 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:32:58,692 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_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/sv-benchmarks/c/array-tiling/rew.c[394,407] [2021-11-20 23:32:58,697 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:58,710 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:32:58,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58 WrapperNode [2021-11-20 23:32:58,710 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:58,711 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:58,711 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:32:58,711 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:32:58,718 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,742 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 58 [2021-11-20 23:32:58,742 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:58,743 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:32:58,743 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:32:58,743 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:32:58,751 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,752 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,753 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,758 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,761 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:32:58,765 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:32:58,765 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:32:58,765 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:32:58,766 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (1/1) ... [2021-11-20 23:32:58,781 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:58,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:58,799 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:32:58,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:32:58,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:32:58,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:32:58,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:32:58,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-20 23:32:58,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:32:58,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:32:58,836 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:32:58,897 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:32:58,899 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:32:59,084 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:32:59,110 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:32:59,111 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:32:59,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:59 BoogieIcfgContainer [2021-11-20 23:32:59,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:32:59,115 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:32:59,115 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:32:59,118 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:32:59,118 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:32:58" (1/3) ... [2021-11-20 23:32:59,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31bf2fbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:59, skipping insertion in model container [2021-11-20 23:32:59,119 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:58" (2/3) ... [2021-11-20 23:32:59,119 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31bf2fbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:59, skipping insertion in model container [2021-11-20 23:32:59,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:59" (3/3) ... [2021-11-20 23:32:59,121 INFO L111 eAbstractionObserver]: Analyzing ICFG rew.c [2021-11-20 23:32:59,126 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:32:59,126 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:32:59,171 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:32:59,178 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 [2021-11-20 23:32:59,179 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:32:59,192 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:32:59,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:32:59,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:59,197 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:32:59,198 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:59,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:59,203 INFO L85 PathProgramCache]: Analyzing trace with hash -1740444559, now seen corresponding path program 1 times [2021-11-20 23:32:59,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:59,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011098020] [2021-11-20 23:32:59,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:59,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:59,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:59,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:59,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:59,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011098020] [2021-11-20 23:32:59,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011098020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:32:59,379 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:32:59,379 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:32:59,381 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012052801] [2021-11-20 23:32:59,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:32:59,385 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:32:59,386 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:32:59,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:32:59,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:32:59,413 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 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 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:32:59,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:32:59,448 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-20 23:32:59,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:32:59,451 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 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 6 [2021-11-20 23:32:59,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:32:59,458 INFO L225 Difference]: With dead ends: 18 [2021-11-20 23:32:59,458 INFO L226 Difference]: Without dead ends: 9 [2021-11-20 23:32:59,461 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 [2021-11-20 23:32:59,482 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:32:59,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:32:59,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-20 23:32:59,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-20 23:32:59,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:32:59,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-20 23:32:59,533 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-20 23:32:59,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:32:59,533 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-20 23:32:59,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:32:59,534 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-20 23:32:59,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-20 23:32:59,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:59,535 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:32:59,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:32:59,535 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:59,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:59,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1884425115, now seen corresponding path program 1 times [2021-11-20 23:32:59,537 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:59,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654102497] [2021-11-20 23:32:59,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:59,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:32:59,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:59,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:59,606 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:32:59,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654102497] [2021-11-20 23:32:59,606 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654102497] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:32:59,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464919070] [2021-11-20 23:32:59,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:59,607 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:32:59,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:59,610 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:32:59,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:32:59,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:32:59,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:32:59,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:32:59,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:59,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:32:59,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:32:59,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464919070] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:32:59,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [413105480] [2021-11-20 23:32:59,877 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:32:59,877 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:32:59,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:32:59,886 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:32:59,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:00,096 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:00,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:00,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:00,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:33:00,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:00,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,015 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:33:01,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:33:01,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 84 [2021-11-20 23:33:01,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:01,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 84 [2021-11-20 23:33:02,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:02,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:02,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:02,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:02,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:02,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 90 [2021-11-20 23:33:03,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:03,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:03,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:33:03,718 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:03,970 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:03,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:03,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-20 23:33:03,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758911956] [2021-11-20 23:33:03,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:03,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:33:03,972 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:03,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:33:03,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:33:03,974 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:04,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:04,010 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-11-20 23:33:04,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:04,011 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 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 7 [2021-11-20 23:33:04,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:04,012 INFO L225 Difference]: With dead ends: 15 [2021-11-20 23:33:04,012 INFO L226 Difference]: Without dead ends: 10 [2021-11-20 23:33:04,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:33:04,022 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:04,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 14 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:33:04,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-20 23:33:04,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-20 23:33:04,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:04,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-20 23:33:04,030 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-20 23:33:04,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:04,030 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-20 23:33:04,031 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 7 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:04,031 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-20 23:33:04,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:33:04,032 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:04,032 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:33:04,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:04,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-20 23:33:04,249 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:04,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:04,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1708731983, now seen corresponding path program 2 times [2021-11-20 23:33:04,250 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:04,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112020689] [2021-11-20 23:33:04,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:04,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:04,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:04,459 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:04,460 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:04,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112020689] [2021-11-20 23:33:04,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112020689] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:04,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334926355] [2021-11-20 23:33:04,461 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:33:04,461 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:04,461 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:04,462 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:04,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:33:04,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:33:04,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:04,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:33:04,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:04,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-20 23:33:04,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:04,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:04,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:04,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 71 [2021-11-20 23:33:04,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:04,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-20 23:33:04,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:04,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 25 [2021-11-20 23:33:04,971 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 23:33:04,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 34 [2021-11-20 23:33:05,012 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:05,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:05,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-20 23:33:05,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 71 [2021-11-20 23:33:05,191 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:05,194 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334926355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:05,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1074457632] [2021-11-20 23:33:05,202 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:33:05,202 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:05,203 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:05,204 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:05,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:05,346 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:05,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:05,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:05,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:05,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:05,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:05,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:05,938 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:05,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:33:06,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:06,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:06,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 78 [2021-11-20 23:33:07,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 81 [2021-11-20 23:33:07,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:07,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 72 [2021-11-20 23:33:08,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:08,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:08,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:08,797 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:09,109 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:09,109 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:09,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2021-11-20 23:33:09,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096702353] [2021-11-20 23:33:09,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:09,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:33:09,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:09,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:33:09,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:33:09,111 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:09,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:09,322 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-11-20 23:33:09,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:33:09,322 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 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 8 [2021-11-20 23:33:09,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:09,323 INFO L225 Difference]: With dead ends: 16 [2021-11-20 23:33:09,323 INFO L226 Difference]: Without dead ends: 14 [2021-11-20 23:33:09,324 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:33:09,325 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 5 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:09,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 28 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 51 Invalid, 0 Unknown, 15 Unchecked, 0.0s Time] [2021-11-20 23:33:09,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-20 23:33:09,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 12. [2021-11-20 23:33:09,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:09,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-20 23:33:09,329 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-11-20 23:33:09,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:09,329 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-20 23:33:09,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:09,330 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-20 23:33:09,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:33:09,330 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:09,330 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:33:09,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:09,541 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:09,542 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:09,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:09,542 INFO L85 PathProgramCache]: Analyzing trace with hash -876836285, now seen corresponding path program 1 times [2021-11-20 23:33:09,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:09,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127170857] [2021-11-20 23:33:09,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:09,542 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:09,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:09,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:09,823 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:09,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127170857] [2021-11-20 23:33:09,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127170857] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:09,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [125253730] [2021-11-20 23:33:09,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:09,823 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:09,823 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:09,824 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:09,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:33:09,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:09,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:33:09,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:09,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:33:10,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2021-11-20 23:33:10,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:10,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:10,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:33:10,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:33:10,216 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:10,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [125253730] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:10,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1119547125] [2021-11-20 23:33:10,219 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:10,219 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:10,219 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:10,219 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:10,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:10,330 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:33:10,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:33:10,400 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:10,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:10,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:10,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:10,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:10,826 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:10,922 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:10,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:33:11,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:11,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:11,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-20 23:33:11,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:11,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:11,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:11,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-20 23:33:12,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:12,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:33:13,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:13,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:13,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:33:14,233 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:14,702 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:14,703 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:14,703 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-20 23:33:14,703 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135737966] [2021-11-20 23:33:14,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:14,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:33:14,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:14,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:33:14,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:33:14,704 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:14,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:14,885 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-20 23:33:14,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:33:14,886 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 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 11 [2021-11-20 23:33:14,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:14,886 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:33:14,886 INFO L226 Difference]: Without dead ends: 25 [2021-11-20 23:33:14,887 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:33:14,888 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:14,888 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 48 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:14,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-20 23:33:14,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2021-11-20 23:33:14,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:14,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-20 23:33:14,894 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-11-20 23:33:14,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:14,894 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-20 23:33:14,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:14,894 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-20 23:33:14,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:33:14,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:14,895 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:33:14,922 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:15,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:15,105 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:15,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:15,106 INFO L85 PathProgramCache]: Analyzing trace with hash -755739303, now seen corresponding path program 2 times [2021-11-20 23:33:15,106 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:15,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432415093] [2021-11-20 23:33:15,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:15,106 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:15,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:15,353 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:15,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:15,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432415093] [2021-11-20 23:33:15,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432415093] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:15,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678773111] [2021-11-20 23:33:15,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:33:15,354 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:15,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:15,360 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:15,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:33:15,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:33:15,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:15,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:33:15,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:15,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:33:15,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:15,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:15,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:15,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:33:15,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:15,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2021-11-20 23:33:15,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:15,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 27 [2021-11-20 23:33:15,879 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-20 23:33:15,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 52 treesize of output 34 [2021-11-20 23:33:15,923 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:15,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:16,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:33:16,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:33:16,151 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:16,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678773111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:16,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [214894266] [2021-11-20 23:33:16,153 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:16,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:16,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:16,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:16,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:16,288 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:16,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:16,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:16,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:16,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,694 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:16,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:16,699 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:16,798 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:16,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:33:17,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:17,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:17,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:17,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-20 23:33:17,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:17,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:17,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 122 treesize of output 69 [2021-11-20 23:33:18,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:18,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:18,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:18,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:18,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:18,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 81 [2021-11-20 23:33:19,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:19,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:19,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:20,102 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:20,583 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:20,583 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:20,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2021-11-20 23:33:20,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345039732] [2021-11-20 23:33:20,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:20,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:33:20,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:20,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:33:20,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=669, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:33:20,585 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:21,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:21,189 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-20 23:33:21,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:33:21,189 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 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 12 [2021-11-20 23:33:21,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:21,190 INFO L225 Difference]: With dead ends: 25 [2021-11-20 23:33:21,190 INFO L226 Difference]: Without dead ends: 23 [2021-11-20 23:33:21,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=227, Invalid=1333, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:33:21,192 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 19 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:21,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 46 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 118 Invalid, 0 Unknown, 41 Unchecked, 0.1s Time] [2021-11-20 23:33:21,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-20 23:33:21,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2021-11-20 23:33:21,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:21,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-20 23:33:21,197 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-11-20 23:33:21,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:21,197 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-20 23:33:21,197 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:21,198 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-20 23:33:21,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:33:21,198 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:21,198 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:33:21,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:21,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:21,415 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:21,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:21,416 INFO L85 PathProgramCache]: Analyzing trace with hash 166604913, now seen corresponding path program 3 times [2021-11-20 23:33:21,416 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:21,416 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998096104] [2021-11-20 23:33:21,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:21,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:21,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:21,493 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:21,493 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:21,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998096104] [2021-11-20 23:33:21,493 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998096104] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:21,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656608920] [2021-11-20 23:33:21,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:33:21,494 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:21,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:21,494 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:21,495 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:33:21,522 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:33:21,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:21,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:33:21,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:21,614 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:21,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:21,652 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:21,652 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656608920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:21,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581178453] [2021-11-20 23:33:21,654 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:21,654 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:21,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:21,655 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:21,655 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:21,764 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:33:21,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:33:21,840 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:21,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:21,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:21,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:21,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:21,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:22,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:22,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,193 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:22,314 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:22,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:33:22,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:22,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-20 23:33:23,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 85 [2021-11-20 23:33:23,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:23,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 79 [2021-11-20 23:33:24,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:24,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:24,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:25,609 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:26,043 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:26,043 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:26,043 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-20 23:33:26,043 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507212213] [2021-11-20 23:33:26,044 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:26,044 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:33:26,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:26,044 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:33:26,044 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:33:26,045 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:26,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:26,116 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-20 23:33:26,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:33:26,116 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 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 14 [2021-11-20 23:33:26,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:26,117 INFO L225 Difference]: With dead ends: 34 [2021-11-20 23:33:26,117 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 23:33:26,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:33:26,119 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:26,119 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 25 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:33:26,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 23:33:26,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2021-11-20 23:33:26,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:26,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-20 23:33:26,124 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-11-20 23:33:26,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:26,125 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-20 23:33:26,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:26,125 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-20 23:33:26,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:33:26,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:26,126 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:33:26,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:26,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:33:26,334 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:26,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:26,335 INFO L85 PathProgramCache]: Analyzing trace with hash -5732965, now seen corresponding path program 4 times [2021-11-20 23:33:26,335 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:26,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [749232873] [2021-11-20 23:33:26,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:26,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:26,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:26,464 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:26,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:26,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [749232873] [2021-11-20 23:33:26,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [749232873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:26,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970719719] [2021-11-20 23:33:26,465 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:33:26,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:26,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:26,471 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:26,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:33:26,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:26,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:33:26,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:26,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:33:26,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:33:26,768 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:26,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:26,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:33:26,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:33:26,945 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:26,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970719719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:26,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [203698815] [2021-11-20 23:33:26,948 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:26,948 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:26,948 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:26,948 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:26,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:27,059 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:27,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:27,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:27,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:33:27,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,529 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,621 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:33:27,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:33:27,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:27,960 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:33:27,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 312 [2021-11-20 23:33:28,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:28,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:28,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:28,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:28,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:28,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 187 treesize of output 96 [2021-11-20 23:33:29,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:29,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:29,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:30,340 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:30,868 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:30,868 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:30,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2021-11-20 23:33:30,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932556483] [2021-11-20 23:33:30,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:30,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:33:30,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:30,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:33:30,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=838, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:33:30,871 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:31,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:31,220 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-20 23:33:31,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:33:31,220 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:33:31,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:31,221 INFO L225 Difference]: With dead ends: 34 [2021-11-20 23:33:31,221 INFO L226 Difference]: Without dead ends: 32 [2021-11-20 23:33:31,222 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=158, Invalid=1248, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:33:31,223 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 13 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:31,223 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 98 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:31,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-20 23:33:31,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2021-11-20 23:33:31,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:31,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-20 23:33:31,229 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-11-20 23:33:31,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:31,229 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-20 23:33:31,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:31,230 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-20 23:33:31,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:33:31,230 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:31,231 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:33:31,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:31,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:33:31,449 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:31,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:31,450 INFO L85 PathProgramCache]: Analyzing trace with hash -1053239887, now seen corresponding path program 5 times [2021-11-20 23:33:31,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:31,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456463001] [2021-11-20 23:33:31,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:31,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:31,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:31,655 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:31,655 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:31,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456463001] [2021-11-20 23:33:31,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456463001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:31,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140620647] [2021-11-20 23:33:31,656 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:33:31,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:31,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:31,657 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:31,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:33:31,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:33:31,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:31,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:33:31,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:31,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:33:31,900 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:33:31,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:33:31,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:31,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:33:31,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:31,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:33:32,256 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:33:32,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 34 [2021-11-20 23:33:32,301 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:32,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:32,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:33:32,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:33:32,592 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:32,593 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140620647] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:32,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403687715] [2021-11-20 23:33:32,594 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:32,594 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:32,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:32,595 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:32,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:32,709 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:32,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:32,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:32,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:32,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:33,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:33,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,063 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:33,165 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:33,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:33:33,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:33,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:33,774 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:33:33,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 301 [2021-11-20 23:33:34,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:34,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:34,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:34,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:34,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:34,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 84 [2021-11-20 23:33:35,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:35,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:35,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:35,993 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:36,526 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:36,526 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:36,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 28 [2021-11-20 23:33:36,526 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447164508] [2021-11-20 23:33:36,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:36,526 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:33:36,527 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:36,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:33:36,527 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1015, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:33:36,527 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:38,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:38,532 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-11-20 23:33:38,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-20 23:33:38,532 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:33:38,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:38,533 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:33:38,533 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:33:38,534 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=302, Invalid=2148, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:33:38,535 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 25 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:38,535 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 96 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 163 Invalid, 0 Unknown, 60 Unchecked, 0.1s Time] [2021-11-20 23:33:38,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:33:38,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 19. [2021-11-20 23:33:38,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:38,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-20 23:33:38,540 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2021-11-20 23:33:38,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:38,541 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-20 23:33:38,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:38,541 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-20 23:33:38,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:33:38,542 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:38,542 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:33:38,567 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:38,749 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:38,750 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:38,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:38,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1013208601, now seen corresponding path program 6 times [2021-11-20 23:33:38,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:38,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904340892] [2021-11-20 23:33:38,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:38,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:38,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:38,821 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:38,821 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:38,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904340892] [2021-11-20 23:33:38,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904340892] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:38,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943275360] [2021-11-20 23:33:38,822 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:33:38,822 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:38,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:38,823 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:38,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:33:38,858 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:33:38,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:38,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:33:38,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:38,974 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:38,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:39,032 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:39,032 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [943275360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:39,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [959187605] [2021-11-20 23:33:39,034 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:39,034 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:39,034 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:39,035 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:39,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:39,160 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:33:39,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:33:39,217 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:39,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:39,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:33:39,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:39,731 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:33:39,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:33:40,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,346 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:33:40,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 280 [2021-11-20 23:33:40,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:40,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 159 treesize of output 84 [2021-11-20 23:33:41,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:41,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:41,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:33:42,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:43,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:43,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:43,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-20 23:33:43,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584804054] [2021-11-20 23:33:43,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:43,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:33:43,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:43,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:33:43,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:33:43,078 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:43,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:43,162 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-20 23:33:43,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:33:43,163 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 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 18 [2021-11-20 23:33:43,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:43,163 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:33:43,163 INFO L226 Difference]: Without dead ends: 26 [2021-11-20 23:33:43,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:33:43,164 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:43,165 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 34 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:33:43,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-20 23:33:43,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2021-11-20 23:33:43,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:43,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-20 23:33:43,171 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-11-20 23:33:43,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:43,171 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-20 23:33:43,171 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:43,171 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-20 23:33:43,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:33:43,172 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:43,172 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:33:43,195 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:43,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:43,381 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:43,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:43,382 INFO L85 PathProgramCache]: Analyzing trace with hash 1966868035, now seen corresponding path program 7 times [2021-11-20 23:33:43,382 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:43,382 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610367869] [2021-11-20 23:33:43,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:43,382 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:43,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:43,689 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:43,689 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:43,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610367869] [2021-11-20 23:33:43,689 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [610367869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:43,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948302947] [2021-11-20 23:33:43,689 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:33:43,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:43,690 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:43,694 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:43,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:33:43,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:43,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-20 23:33:43,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:43,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:33:44,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:33:44,056 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:44,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:44,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:33:44,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:33:44,267 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:44,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948302947] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:44,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [998015543] [2021-11-20 23:33:44,269 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:44,269 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:44,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:44,270 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:44,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:44,381 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:44,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:44,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:44,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:33:44,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:44,824 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:33:44,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:33:45,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-20 23:33:45,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:45,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 169 treesize of output 90 [2021-11-20 23:33:46,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 84 [2021-11-20 23:33:46,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:46,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:46,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:33:47,578 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:48,081 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:48,081 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:48,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2021-11-20 23:33:48,081 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688938402] [2021-11-20 23:33:48,081 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:48,082 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-20 23:33:48,082 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:48,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-20 23:33:48,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1209, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:33:48,083 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:48,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:48,419 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-20 23:33:48,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:33:48,419 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-20 23:33:48,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:48,420 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:33:48,420 INFO L226 Difference]: Without dead ends: 39 [2021-11-20 23:33:48,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=190, Invalid=1702, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:33:48,422 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 25 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:48,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 111 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:48,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-20 23:33:48,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 24. [2021-11-20 23:33:48,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:48,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-11-20 23:33:48,429 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2021-11-20 23:33:48,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:48,429 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-11-20 23:33:48,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:48,430 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-11-20 23:33:48,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:33:48,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:48,431 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:33:48,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:48,645 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:33:48,645 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:48,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:48,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1465539417, now seen corresponding path program 8 times [2021-11-20 23:33:48,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:48,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853916534] [2021-11-20 23:33:48,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:48,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:48,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:48,919 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:48,919 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:48,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853916534] [2021-11-20 23:33:48,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853916534] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:48,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804624527] [2021-11-20 23:33:48,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:33:48,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:48,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:48,920 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:48,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:33:48,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:33:48,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:48,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:33:48,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:49,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:33:49,156 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:33:49,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:33:49,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:49,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:33:49,190 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:33:49,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:33:49,502 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:33:49,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 34 [2021-11-20 23:33:49,532 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:49,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:49,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:33:49,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:33:49,850 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:49,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804624527] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:49,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [289323152] [2021-11-20 23:33:49,851 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:49,851 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:49,852 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:49,852 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:49,852 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:49,943 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:49,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:49,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:50,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:50,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,277 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:50,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:50,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:50,385 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:50,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:33:51,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,091 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:51,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 18 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-20 23:33:51,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-20 23:33:51,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:51,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 85 [2021-11-20 23:33:52,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:52,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:52,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:33:53,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:53,796 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:53,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:53,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 34 [2021-11-20 23:33:53,797 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742660604] [2021-11-20 23:33:53,797 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:53,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:33:53,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:53,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:33:53,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1425, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:33:53,799 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:54,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:54,716 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2021-11-20 23:33:54,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:33:54,717 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 23:33:54,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:54,718 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:33:54,718 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:33:54,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=385, Invalid=3155, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:33:54,720 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 46 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:54,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 140 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 245 Invalid, 0 Unknown, 43 Unchecked, 0.2s Time] [2021-11-20 23:33:54,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:33:54,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 23. [2021-11-20 23:33:54,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:54,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-20 23:33:54,732 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-11-20 23:33:54,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:54,734 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-20 23:33:54,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:54,734 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-20 23:33:54,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-20 23:33:54,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:54,735 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:33:54,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:54,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:33:54,949 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:54,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:54,950 INFO L85 PathProgramCache]: Analyzing trace with hash -1267911567, now seen corresponding path program 9 times [2021-11-20 23:33:54,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:54,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315892786] [2021-11-20 23:33:54,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:54,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:54,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:55,050 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:55,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:55,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315892786] [2021-11-20 23:33:55,050 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315892786] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:55,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114052406] [2021-11-20 23:33:55,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:33:55,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:55,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:55,053 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:55,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:33:55,101 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:33:55,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:33:55,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:33:55,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:55,251 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:55,251 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:33:55,311 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:55,312 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114052406] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:33:55,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [729485653] [2021-11-20 23:33:55,314 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:33:55,314 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:33:55,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:33:55,314 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:33:55,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:33:55,460 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:33:55,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:33:55,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:33:55,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:33:55,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:55,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:55,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:55,868 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:33:55,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:33:56,547 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:33:56,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:56,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:56,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:56,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:56,588 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:33:56,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 285 [2021-11-20 23:33:57,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:33:57,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:33:57,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:33:57,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:33:58,627 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:33:59,064 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:33:59,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:33:59,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-20 23:33:59,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205377251] [2021-11-20 23:33:59,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:33:59,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:33:59,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:59,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:33:59,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:33:59,066 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:59,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:59,176 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-20 23:33:59,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:33:59,176 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-20 23:33:59,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:59,177 INFO L225 Difference]: With dead ends: 48 [2021-11-20 23:33:59,177 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:33:59,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=153, Invalid=659, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:59,178 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 44 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:59,178 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 39 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:59,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:33:59,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-20 23:33:59,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:59,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-20 23:33:59,195 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-11-20 23:33:59,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:59,196 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-20 23:33:59,196 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:33:59,196 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-20 23:33:59,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:33:59,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:59,198 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:33:59,221 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:59,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:33:59,409 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:59,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:59,410 INFO L85 PathProgramCache]: Analyzing trace with hash 1547485083, now seen corresponding path program 10 times [2021-11-20 23:33:59,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:59,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009814774] [2021-11-20 23:33:59,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:59,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:59,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:33:59,642 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:59,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009814774] [2021-11-20 23:33:59,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009814774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:59,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1040708291] [2021-11-20 23:33:59,643 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:33:59,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:59,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:59,643 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:59,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:33:59,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:59,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-20 23:33:59,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:59,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:34:00,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:34:00,070 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:00,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:00,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:34:00,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:34:00,385 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:00,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1040708291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:00,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [599439215] [2021-11-20 23:34:00,387 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:00,387 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:00,387 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:00,388 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:00,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:00,482 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:34:00,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:34:00,552 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:00,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:00,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:34:00,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:00,926 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:34:00,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:34:01,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-20 23:34:01,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 157 treesize of output 87 [2021-11-20 23:34:01,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:01,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 166 treesize of output 87 [2021-11-20 23:34:02,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:02,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:02,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:34:03,225 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:03,782 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:03,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:03,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 37 [2021-11-20 23:34:03,783 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896471054] [2021-11-20 23:34:03,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:03,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:34:03,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:03,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:34:03,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1676, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:34:03,785 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:04,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:04,446 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-20 23:34:04,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:34:04,447 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-20 23:34:04,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:04,447 INFO L225 Difference]: With dead ends: 48 [2021-11-20 23:34:04,448 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 23:34:04,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=234, Invalid=2628, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:34:04,449 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 26 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:04,449 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 176 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:34:04,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 23:34:04,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 28. [2021-11-20 23:34:04,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:04,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-20 23:34:04,458 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-11-20 23:34:04,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:04,458 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-20 23:34:04,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 37 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:04,459 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-20 23:34:04,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:34:04,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:04,459 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:34:04,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:04,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:34:04,660 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:04,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:04,661 INFO L85 PathProgramCache]: Analyzing trace with hash -1369531983, now seen corresponding path program 11 times [2021-11-20 23:34:04,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:04,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023785053] [2021-11-20 23:34:04,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:04,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:04,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:04,922 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:04,923 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:04,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023785053] [2021-11-20 23:34:04,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023785053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:04,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332497676] [2021-11-20 23:34:04,923 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:34:04,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:04,923 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:04,924 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:04,926 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:34:05,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:34:05,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:34:05,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-20 23:34:05,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:05,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:34:05,230 INFO L354 Elim1Store]: treesize reduction 133, result has 21.8 percent of original size [2021-11-20 23:34:05,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 81 [2021-11-20 23:34:05,252 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:05,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:34:05,303 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:05,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 18 [2021-11-20 23:34:05,313 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:05,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:34:05,877 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:05,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 31 [2021-11-20 23:34:05,908 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:05,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:12,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-11-20 23:34:12,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 78 [2021-11-20 23:34:12,176 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:12,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332497676] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:12,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1371825076] [2021-11-20 23:34:12,178 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:12,178 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:12,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:12,179 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:12,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:12,278 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:12,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:12,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:34:12,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:34:12,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:12,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:12,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:12,693 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:34:12,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:34:13,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:13,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:13,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:13,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-20 23:34:13,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:13,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:13,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-20 23:34:14,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:34:14,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:14,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:14,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:34:15,506 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:16,075 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:16,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:16,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 40 [2021-11-20 23:34:16,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537339253] [2021-11-20 23:34:16,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:16,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:34:16,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:16,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:34:16,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1917, Unknown=12, NotChecked=0, Total=2070 [2021-11-20 23:34:16,078 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:18,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:18,061 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-11-20 23:34:18,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:34:18,062 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-20 23:34:18,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:18,062 INFO L225 Difference]: With dead ends: 65 [2021-11-20 23:34:18,063 INFO L226 Difference]: Without dead ends: 63 [2021-11-20 23:34:18,064 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=480, Invalid=4477, Unknown=13, NotChecked=0, Total=4970 [2021-11-20 23:34:18,065 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 61 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:18,065 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 151 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 363 Invalid, 0 Unknown, 59 Unchecked, 0.2s Time] [2021-11-20 23:34:18,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-20 23:34:18,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 29. [2021-11-20 23:34:18,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:18,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-11-20 23:34:18,077 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 24 [2021-11-20 23:34:18,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:18,077 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-11-20 23:34:18,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 40 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:18,078 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-11-20 23:34:18,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:34:18,079 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:18,079 INFO L514 BasicCegarLoop]: trace histogram [7, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:34:18,099 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:18,281 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:34:18,281 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:18,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:18,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1602747813, now seen corresponding path program 12 times [2021-11-20 23:34:18,282 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:18,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741051060] [2021-11-20 23:34:18,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:18,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:18,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:18,591 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:18,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:18,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741051060] [2021-11-20 23:34:18,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741051060] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:18,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172118768] [2021-11-20 23:34:18,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:34:18,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:18,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:18,593 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:18,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:34:18,646 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:34:18,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:34:18,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:34:18,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:18,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:34:18,898 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:34:18,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 75 [2021-11-20 23:34:18,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:18,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-11-20 23:34:18,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:18,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:18,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:18,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 10 [2021-11-20 23:34:19,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:19,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 51 [2021-11-20 23:34:19,217 INFO L354 Elim1Store]: treesize reduction 230, result has 19.3 percent of original size [2021-11-20 23:34:19,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 88 treesize of output 92 [2021-11-20 23:34:20,375 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:34:20,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 42 [2021-11-20 23:34:20,417 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 1 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:20,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:21,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 47 [2021-11-20 23:34:21,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 802 treesize of output 794 [2021-11-20 23:34:22,424 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:22,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172118768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:22,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [722651144] [2021-11-20 23:34:22,425 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:22,426 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:22,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:22,426 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:22,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:22,533 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:34:22,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:34:22,607 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:22,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:22,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:34:22,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:22,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,012 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:34:23,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:34:23,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:23,316 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:34:23,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 271 [2021-11-20 23:34:24,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 81 [2021-11-20 23:34:24,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:24,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:24,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:34:25,784 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:26,500 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:26,500 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:26,500 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 43 [2021-11-20 23:34:26,500 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530946424] [2021-11-20 23:34:26,501 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:26,501 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:34:26,501 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:26,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:34:26,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2189, Unknown=2, NotChecked=0, Total=2352 [2021-11-20 23:34:26,502 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:28,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:28,403 INFO L93 Difference]: Finished difference Result 51 states and 54 transitions. [2021-11-20 23:34:28,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:34:28,403 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-20 23:34:28,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:28,404 INFO L225 Difference]: With dead ends: 51 [2021-11-20 23:34:28,404 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:34:28,406 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 996 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=543, Invalid=5155, Unknown=2, NotChecked=0, Total=5700 [2021-11-20 23:34:28,407 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 523 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 139 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:28,407 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 243 Invalid, 523 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 349 Invalid, 0 Unknown, 139 Unchecked, 0.2s Time] [2021-11-20 23:34:28,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:34:28,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 27. [2021-11-20 23:34:28,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:28,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-20 23:34:28,416 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 25 [2021-11-20 23:34:28,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:28,417 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-20 23:34:28,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.627906976744186) internal successors, (70), 43 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:28,417 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-20 23:34:28,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 23:34:28,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:28,418 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1] [2021-11-20 23:34:28,452 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:28,631 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:28,631 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:28,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:28,631 INFO L85 PathProgramCache]: Analyzing trace with hash -1045570535, now seen corresponding path program 13 times [2021-11-20 23:34:28,631 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:28,632 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19243890] [2021-11-20 23:34:28,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:28,632 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:28,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:28,757 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:28,757 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:28,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19243890] [2021-11-20 23:34:28,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19243890] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:28,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242041854] [2021-11-20 23:34:28,758 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:34:28,758 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:28,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:28,759 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:28,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:34:28,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:28,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:34:28,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:28,970 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:28,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:29,034 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:29,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242041854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:29,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [16465910] [2021-11-20 23:34:29,036 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:29,036 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:29,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:29,037 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:29,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:29,129 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:29,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:29,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:34:29,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:34:29,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,483 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:29,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:29,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:29,611 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:34:29,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:34:30,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:30,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:30,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-20 23:34:30,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:30,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:30,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:30,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-20 23:34:31,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:34:31,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:31,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:31,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:34:32,360 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:32,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:32,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:32,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-20 23:34:32,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028510988] [2021-11-20 23:34:32,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:32,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:34:32,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:32,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:34:32,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:34:32,797 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:32,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:32,908 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-20 23:34:32,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:34:32,909 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-20 23:34:32,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:32,909 INFO L225 Difference]: With dead ends: 55 [2021-11-20 23:34:32,909 INFO L226 Difference]: Without dead ends: 34 [2021-11-20 23:34:32,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=201, Invalid=855, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:34:32,911 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 44 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:32,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 35 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:34:32,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-20 23:34:32,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2021-11-20 23:34:32,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:32,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-11-20 23:34:32,919 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2021-11-20 23:34:32,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:32,919 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-11-20 23:34:32,919 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 22 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:32,919 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-11-20 23:34:32,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:34:32,920 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:32,920 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-20 23:34:32,939 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:33,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:34:33,120 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:33,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:33,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1827683773, now seen corresponding path program 14 times [2021-11-20 23:34:33,121 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:33,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836001616] [2021-11-20 23:34:33,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:33,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:33,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:33,373 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:33,373 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:33,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836001616] [2021-11-20 23:34:33,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836001616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:33,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248149904] [2021-11-20 23:34:33,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:34:33,374 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:33,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:33,375 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:33,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:34:33,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:34:33,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:34:33,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:34:33,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:33,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-20 23:34:34,158 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-20 23:34:34,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 42 [2021-11-20 23:34:34,195 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 35 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:34,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:34,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-20 23:34:34,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2021-11-20 23:34:34,999 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:34,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248149904] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:34,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353661591] [2021-11-20 23:34:35,001 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:35,001 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:35,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:35,002 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:35,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:35,114 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:35,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:35,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:34:35,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:34:35,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:35,640 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:34:35,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:34:36,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,099 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:34:36,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 312 [2021-11-20 23:34:36,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:36,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 187 treesize of output 96 [2021-11-20 23:34:37,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:37,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:37,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:34:38,285 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:38,881 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:38,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:38,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 43 [2021-11-20 23:34:38,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268309263] [2021-11-20 23:34:38,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:38,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:34:38,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:38,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:34:38,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=2085, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:34:38,885 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 43 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:39,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:39,590 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-11-20 23:34:39,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:34:39,597 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 43 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-20 23:34:39,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:39,598 INFO L225 Difference]: With dead ends: 50 [2021-11-20 23:34:39,598 INFO L226 Difference]: Without dead ends: 29 [2021-11-20 23:34:39,600 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 846 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=476, Invalid=3946, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:34:39,601 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 8 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 37 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:39,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 72 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 37 Unchecked, 0.0s Time] [2021-11-20 23:34:39,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-20 23:34:39,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-20 23:34:39,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:39,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-11-20 23:34:39,615 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 27 [2021-11-20 23:34:39,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:39,616 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-11-20 23:34:39,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.7674418604651163) internal successors, (76), 43 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:39,616 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-11-20 23:34:39,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:34:39,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:39,617 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-20 23:34:39,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:39,833 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:34:39,833 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:39,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:39,834 INFO L85 PathProgramCache]: Analyzing trace with hash -303390375, now seen corresponding path program 15 times [2021-11-20 23:34:39,834 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:39,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327563530] [2021-11-20 23:34:39,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:39,834 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:39,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:40,159 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:40,159 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:40,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327563530] [2021-11-20 23:34:40,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327563530] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:40,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446418549] [2021-11-20 23:34:40,160 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:34:40,160 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:40,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:40,165 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:40,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:34:40,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:34:40,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:34:40,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-20 23:34:40,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:40,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:34:40,506 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:34:40,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:34:40,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:40,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:34:40,545 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:40,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:34:41,712 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:41,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 34 [2021-11-20 23:34:41,746 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:41,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:42,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:34:42,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:34:42,284 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:42,284 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446418549] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:42,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1721579490] [2021-11-20 23:34:42,285 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:42,286 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:42,286 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:42,286 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:42,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:42,415 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:34:42,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:34:42,491 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:42,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:42,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:34:42,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,780 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:42,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:42,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:42,916 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:34:42,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:34:43,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:43,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:43,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:43,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 82 [2021-11-20 23:34:43,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:43,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:43,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 129 treesize of output 72 [2021-11-20 23:34:44,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 151 treesize of output 82 [2021-11-20 23:34:44,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:44,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:44,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:34:45,895 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:46,532 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:46,532 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:46,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 46 [2021-11-20 23:34:46,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745226191] [2021-11-20 23:34:46,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:46,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:34:46,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:46,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:34:46,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=2485, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:34:46,534 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:48,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:48,511 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2021-11-20 23:34:48,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:34:48,512 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:34:48,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:48,512 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:34:48,512 INFO L226 Difference]: Without dead ends: 39 [2021-11-20 23:34:48,513 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 49 SyntacticMatches, 5 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 719 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=248, Invalid=3412, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:34:48,514 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 36 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 29 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:48,514 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 177 Invalid, 316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 278 Invalid, 0 Unknown, 29 Unchecked, 0.2s Time] [2021-11-20 23:34:48,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-20 23:34:48,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2021-11-20 23:34:48,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:48,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-20 23:34:48,525 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 28 [2021-11-20 23:34:48,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:48,526 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-20 23:34:48,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7173913043478262) internal successors, (79), 46 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:48,526 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-20 23:34:48,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 23:34:48,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:48,527 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-20 23:34:48,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:48,745 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:34:48,745 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:48,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:48,746 INFO L85 PathProgramCache]: Analyzing trace with hash -1686193765, now seen corresponding path program 16 times [2021-11-20 23:34:48,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:48,746 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98473391] [2021-11-20 23:34:48,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:48,746 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:48,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:49,069 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:49,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:49,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98473391] [2021-11-20 23:34:49,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98473391] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:49,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582832200] [2021-11-20 23:34:49,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:34:49,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:49,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:49,071 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:49,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:34:49,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:49,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 23:34:49,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:49,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:34:49,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:34:49,702 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:49,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:49,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:34:49,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:34:50,199 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:50,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582832200] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:34:50,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515946777] [2021-11-20 23:34:50,200 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:34:50,200 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:34:50,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:34:50,201 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:34:50,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:34:50,300 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:34:50,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:34:50,359 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:34:50,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:34:50,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:34:50,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,640 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:50,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:50,645 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:50,745 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:34:50,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:34:51,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:51,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:34:51,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:51,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 18 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-20 23:34:51,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:51,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:51,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:51,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 82 [2021-11-20 23:34:52,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 151 treesize of output 82 [2021-11-20 23:34:52,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:34:52,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:34:52,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:34:53,541 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:34:54,169 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:34:54,169 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:34:54,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 49 [2021-11-20 23:34:54,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781729428] [2021-11-20 23:34:54,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:34:54,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:34:54,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:34:54,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:34:54,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=2802, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:34:54,171 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 49 states, 49 states have (on average 1.7959183673469388) internal successors, (88), 49 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:55,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:34:55,137 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-20 23:34:55,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:34:55,137 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.7959183673469388) internal successors, (88), 49 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-20 23:34:55,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:34:55,138 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:34:55,138 INFO L226 Difference]: Without dead ends: 60 [2021-11-20 23:34:55,139 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 842 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=310, Invalid=4520, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:34:55,140 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 824 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 824 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:34:55,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 300 Invalid, 860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 824 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:34:55,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-11-20 23:34:55,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 36. [2021-11-20 23:34:55,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:55,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-20 23:34:55,151 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2021-11-20 23:34:55,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:34:55,151 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-20 23:34:55,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.7959183673469388) internal successors, (88), 49 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:34:55,152 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-20 23:34:55,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:34:55,152 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:34:55,152 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-20 23:34:55,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:34:55,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:55,357 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:34:55,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:34:55,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1091050929, now seen corresponding path program 17 times [2021-11-20 23:34:55,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:34:55,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763195268] [2021-11-20 23:34:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:34:55,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:34:55,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:34:55,736 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:34:55,736 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:34:55,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763195268] [2021-11-20 23:34:55,736 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763195268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:34:55,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618055044] [2021-11-20 23:34:55,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:34:55,737 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:34:55,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:34:55,741 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:34:55,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:34:56,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:34:56,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:34:56,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 23:34:56,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:34:56,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:34:56,444 INFO L354 Elim1Store]: treesize reduction 133, result has 21.8 percent of original size [2021-11-20 23:34:56,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 81 [2021-11-20 23:34:56,467 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:56,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 25 [2021-11-20 23:34:56,490 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:34:56,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 33 [2021-11-20 23:35:01,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:35:02,001 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:02,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:13,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-11-20 23:35:13,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 78 [2021-11-20 23:35:13,602 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:13,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618055044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:13,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149405656] [2021-11-20 23:35:13,603 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:13,603 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:13,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:13,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:13,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:13,691 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:35:13,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:35:13,762 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:35:13,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:35:13,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:13,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:35:14,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,166 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:35:14,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:35:14,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 155 treesize of output 84 [2021-11-20 23:35:14,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:14,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 81 [2021-11-20 23:35:15,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 168 treesize of output 90 [2021-11-20 23:35:15,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:35:15,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:15,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:35:16,550 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:17,237 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:17,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:17,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 52 [2021-11-20 23:35:17,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004610059] [2021-11-20 23:35:17,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:17,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:35:17,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:17,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:35:17,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=3104, Unknown=30, NotChecked=0, Total=3306 [2021-11-20 23:35:17,239 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 52 states, 52 states have (on average 1.75) internal successors, (91), 52 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) [2021-11-20 23:35:54,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:54,950 INFO L93 Difference]: Finished difference Result 103 states and 106 transitions. [2021-11-20 23:35:54,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:35:54,950 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.75) internal successors, (91), 52 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 32 [2021-11-20 23:35:54,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:54,951 INFO L225 Difference]: With dead ends: 103 [2021-11-20 23:35:54,951 INFO L226 Difference]: Without dead ends: 101 [2021-11-20 23:35:54,952 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1515 ImplicationChecksByTransitivity, 55.1s TimeCoverageRelationStatistics Valid=746, Invalid=8876, Unknown=80, NotChecked=0, Total=9702 [2021-11-20 23:35:54,952 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 97 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 739 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 941 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 91 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:54,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 292 Invalid, 941 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 739 Invalid, 0 Unknown, 91 Unchecked, 0.4s Time] [2021-11-20 23:35:54,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-20 23:35:54,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 37. [2021-11-20 23:35:54,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.1111111111111112) internal successors, (40), 36 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:54,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2021-11-20 23:35:54,965 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 32 [2021-11-20 23:35:54,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:54,965 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2021-11-20 23:35:54,966 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.75) internal successors, (91), 52 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) [2021-11-20 23:35:54,966 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2021-11-20 23:35:54,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:35:54,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:54,966 INFO L514 BasicCegarLoop]: trace histogram [9, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-20 23:35:54,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:55,167 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,167 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:55,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:55,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1286290523, now seen corresponding path program 18 times [2021-11-20 23:35:55,167 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:55,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442957332] [2021-11-20 23:35:55,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:55,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,591 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,591 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442957332] [2021-11-20 23:35:55,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442957332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:55,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [936575671] [2021-11-20 23:35:55,591 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:35:55,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:55,594 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:55,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:35:55,649 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:35:55,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:55,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:35:55,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:55,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:35:55,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-20 23:35:55,950 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 23:35:55,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 50 [2021-11-20 23:35:56,225 INFO L354 Elim1Store]: treesize reduction 415, result has 18.9 percent of original size [2021-11-20 23:35:56,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 122 treesize of output 147 [2021-11-20 23:35:56,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,255 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:35:56,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 116 treesize of output 84 [2021-11-20 23:35:56,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:56,372 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:35:56,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 132 treesize of output 80 [2021-11-20 23:35:58,243 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:35:58,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 42 [2021-11-20 23:35:58,288 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 1 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:58,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:00,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 47 [2021-11-20 23:36:00,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 396 treesize of output 392 [2021-11-20 23:36:00,584 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:00,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [936575671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:00,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835783916] [2021-11-20 23:36:00,585 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:00,585 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:00,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:00,586 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:00,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:00,707 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:36:00,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:36:00,779 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:00,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:00,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:36:01,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,159 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:36:01,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:36:01,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 171 treesize of output 93 [2021-11-20 23:36:01,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 171 treesize of output 93 [2021-11-20 23:36:02,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:02,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:02,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:02,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:02,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:02,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 152 treesize of output 81 [2021-11-20 23:36:02,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:03,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:03,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:36:03,830 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:04,586 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:04,586 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:04,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 55 [2021-11-20 23:36:04,586 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155782077] [2021-11-20 23:36:04,586 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:04,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:36:04,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:04,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:36:04,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=3461, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:36:04,587 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 55 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) [2021-11-20 23:36:07,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:07,772 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2021-11-20 23:36:07,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:36:07,773 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 55 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 33 [2021-11-20 23:36:07,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:07,773 INFO L225 Difference]: With dead ends: 61 [2021-11-20 23:36:07,773 INFO L226 Difference]: Without dead ends: 59 [2021-11-20 23:36:07,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 57 SyntacticMatches, 11 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1530 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=645, Invalid=8097, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:36:07,775 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 49 mSDsluCounter, 473 mSDsCounter, 0 mSdLazyCounter, 752 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 487 SdHoareTripleChecker+Invalid, 1264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 752 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 443 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:07,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 487 Invalid, 1264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 752 Invalid, 0 Unknown, 443 Unchecked, 0.4s Time] [2021-11-20 23:36:07,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-20 23:36:07,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2021-11-20 23:36:07,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:07,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-20 23:36:07,786 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 33 [2021-11-20 23:36:07,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:07,786 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-20 23:36:07,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.709090909090909) internal successors, (94), 55 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) [2021-11-20 23:36:07,787 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-20 23:36:07,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:36:07,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:07,787 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1] [2021-11-20 23:36:07,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:07,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-20 23:36:07,989 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:07,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:07,989 INFO L85 PathProgramCache]: Analyzing trace with hash 544317977, now seen corresponding path program 19 times [2021-11-20 23:36:07,989 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:07,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601425332] [2021-11-20 23:36:07,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:07,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:08,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:08,130 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:08,130 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:08,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601425332] [2021-11-20 23:36:08,130 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601425332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:08,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857860861] [2021-11-20 23:36:08,130 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:36:08,130 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:08,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:08,132 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:08,132 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:36:08,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:08,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:36:08,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:08,399 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:08,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:08,476 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:08,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857860861] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:08,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [777644219] [2021-11-20 23:36:08,477 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:08,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:08,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:08,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:08,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:08,603 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:08,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:08,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:36:08,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:36:08,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,873 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:08,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:08,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:08,975 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:36:08,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:36:09,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:09,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:09,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 78 [2021-11-20 23:36:09,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:09,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:09,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:09,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 85 [2021-11-20 23:36:10,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 144 treesize of output 79 [2021-11-20 23:36:11,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:11,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:11,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:36:12,094 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:12,569 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:12,569 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:12,569 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-20 23:36:12,570 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571277874] [2021-11-20 23:36:12,570 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:12,570 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:36:12,570 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:12,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:36:12,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=916, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:36:12,571 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:12,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:12,760 INFO L93 Difference]: Finished difference Result 69 states and 71 transitions. [2021-11-20 23:36:12,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:36:12,762 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-20 23:36:12,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:12,763 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:36:12,763 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:36:12,763 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=318, Invalid=1322, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:36:12,764 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 76 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:12,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 75 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:12,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:36:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 36. [2021-11-20 23:36:12,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:12,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-11-20 23:36:12,777 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 34 [2021-11-20 23:36:12,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:12,778 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-11-20 23:36:12,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.25) internal successors, (63), 28 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:12,778 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-11-20 23:36:12,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:36:12,779 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:12,779 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1] [2021-11-20 23:36:12,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:12,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-20 23:36:12,989 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:12,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:12,990 INFO L85 PathProgramCache]: Analyzing trace with hash -808993213, now seen corresponding path program 20 times [2021-11-20 23:36:12,990 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:12,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818779735] [2021-11-20 23:36:12,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:12,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:13,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:13,377 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:13,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:13,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818779735] [2021-11-20 23:36:13,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818779735] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:13,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133414242] [2021-11-20 23:36:13,378 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:13,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:13,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:13,383 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:13,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:36:13,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:36:13,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:13,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:36:13,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:13,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-20 23:36:14,991 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-20 23:36:14,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 42 [2021-11-20 23:36:15,036 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 70 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:15,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:15,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-20 23:36:15,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2021-11-20 23:36:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 63 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:16,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133414242] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:16,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521565940] [2021-11-20 23:36:16,087 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:16,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:16,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:16,088 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:16,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:16,188 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:36:16,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:36:16,262 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:16,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:16,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:36:16,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:16,662 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:36:16,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:36:17,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,163 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:36:17,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 279 [2021-11-20 23:36:17,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 84 [2021-11-20 23:36:18,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:18,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:18,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:36:19,240 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:19,907 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:19,907 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:19,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 55 [2021-11-20 23:36:19,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258700790] [2021-11-20 23:36:19,907 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:19,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:36:19,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:19,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:36:19,908 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=3250, Unknown=1, NotChecked=0, Total=3660 [2021-11-20 23:36:19,908 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 55 states, 55 states have (on average 1.8181818181818181) internal successors, (100), 55 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:20,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:20,926 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2021-11-20 23:36:20,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:36:20,926 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.8181818181818181) internal successors, (100), 55 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:36:20,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:20,926 INFO L225 Difference]: With dead ends: 64 [2021-11-20 23:36:20,926 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:36:20,927 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1369 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=736, Invalid=6403, Unknown=1, NotChecked=0, Total=7140 [2021-11-20 23:36:20,928 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 8 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:20,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 189 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 75 Invalid, 0 Unknown, 100 Unchecked, 0.0s Time] [2021-11-20 23:36:20,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:36:20,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 23:36:20,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0555555555555556) internal successors, (38), 36 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:20,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2021-11-20 23:36:20,941 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 35 [2021-11-20 23:36:20,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:20,941 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2021-11-20 23:36:20,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.8181818181818181) internal successors, (100), 55 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:20,941 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2021-11-20 23:36:20,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:36:20,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:20,942 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 7, 7, 1, 1, 1, 1, 1] [2021-11-20 23:36:20,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:21,142 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-20 23:36:21,142 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:21,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:21,143 INFO L85 PathProgramCache]: Analyzing trace with hash 188032857, now seen corresponding path program 21 times [2021-11-20 23:36:21,143 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:21,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823508298] [2021-11-20 23:36:21,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:21,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:21,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:21,524 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:21,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823508298] [2021-11-20 23:36:21,525 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823508298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:21,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717613116] [2021-11-20 23:36:21,525 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:36:21,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:21,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:21,532 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:21,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:36:21,578 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:36:21,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:21,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:36:21,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:21,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:36:21,900 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:36:21,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:36:21,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:21,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2021-11-20 23:36:21,935 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:36:21,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 27 [2021-11-20 23:36:30,607 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:36:30,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 34 [2021-11-20 23:36:30,647 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:30,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:31,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:36:31,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:36:31,441 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:31,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717613116] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:31,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1988653134] [2021-11-20 23:36:31,443 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:31,443 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:31,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:31,444 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:31,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:31,535 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:36:31,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:36:31,619 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:31,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:31,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:36:31,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:31,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:32,014 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:36:32,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:36:32,865 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:32,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:32,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:32,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:32,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:32,885 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:36:32,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 365 treesize of output 307 [2021-11-20 23:36:33,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:33,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:33,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:33,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:33,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:33,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 172 treesize of output 91 [2021-11-20 23:36:34,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:34,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:34,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:36:35,157 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:35,891 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:35,891 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:35,891 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 58 [2021-11-20 23:36:35,891 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639734788] [2021-11-20 23:36:35,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:35,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-20 23:36:35,892 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:35,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-20 23:36:35,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=3823, Unknown=2, NotChecked=0, Total=4032 [2021-11-20 23:36:35,892 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 58 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 58 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:39,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:39,936 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-11-20 23:36:39,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:36:39,937 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 58 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-20 23:36:39,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:39,937 INFO L225 Difference]: With dead ends: 44 [2021-11-20 23:36:39,937 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:36:39,938 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 65 SyntacticMatches, 7 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1070 ImplicationChecksByTransitivity, 13.9s TimeCoverageRelationStatistics Valid=308, Invalid=5238, Unknown=4, NotChecked=0, Total=5550 [2021-11-20 23:36:39,939 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 72 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:39,939 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 294 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 437 Invalid, 0 Unknown, 72 Unchecked, 0.3s Time] [2021-11-20 23:36:39,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:36:39,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-11-20 23:36:39,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:39,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-20 23:36:39,956 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 36 [2021-11-20 23:36:39,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:39,956 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-20 23:36:39,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.7758620689655173) internal successors, (103), 58 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:39,957 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-20 23:36:39,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:36:39,957 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:39,958 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1] [2021-11-20 23:36:39,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:40,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 23:36:40,161 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:40,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:40,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1054765979, now seen corresponding path program 22 times [2021-11-20 23:36:40,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:40,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915379422] [2021-11-20 23:36:40,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:40,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:40,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:40,627 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:40,628 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:40,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915379422] [2021-11-20 23:36:40,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [915379422] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:40,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862980474] [2021-11-20 23:36:40,628 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:36:40,628 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:40,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:40,629 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:40,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:36:40,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:40,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 43 conjunts are in the unsatisfiable core [2021-11-20 23:36:40,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:40,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:36:41,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:36:41,493 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:41,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:41,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:36:41,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:36:42,277 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:42,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862980474] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:42,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995163187] [2021-11-20 23:36:42,278 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:42,278 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:42,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:42,279 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:42,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:42,363 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:36:42,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:36:42,434 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:42,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:42,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:36:42,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,700 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:42,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:42,808 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:36:42,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:36:43,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:43,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:43,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:43,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:43,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:43,495 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:36:43,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 277 [2021-11-20 23:36:44,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 75 [2021-11-20 23:36:44,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:44,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:44,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:36:45,580 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:46,319 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:46,319 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:46,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 61 [2021-11-20 23:36:46,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480879966] [2021-11-20 23:36:46,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:46,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:36:46,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:46,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:36:46,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=4216, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:36:46,321 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 61 states, 61 states have (on average 1.8360655737704918) internal successors, (112), 61 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) [2021-11-20 23:36:47,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:47,652 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-11-20 23:36:47,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 23:36:47,652 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.8360655737704918) internal successors, (112), 61 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 39 [2021-11-20 23:36:47,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:47,653 INFO L225 Difference]: With dead ends: 76 [2021-11-20 23:36:47,653 INFO L226 Difference]: Without dead ends: 74 [2021-11-20 23:36:47,654 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1243 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=386, Invalid=6924, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:36:47,654 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 35 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 1073 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 1118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1073 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:47,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 379 Invalid, 1118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1073 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:36:47,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-11-20 23:36:47,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 44. [2021-11-20 23:36:47,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:47,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-11-20 23:36:47,671 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2021-11-20 23:36:47,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:47,671 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-11-20 23:36:47,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.8360655737704918) internal successors, (112), 61 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) [2021-11-20 23:36:47,672 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-11-20 23:36:47,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:36:47,672 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:47,672 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 8, 8, 1, 1, 1, 1, 1] [2021-11-20 23:36:47,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:47,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-20 23:36:47,873 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:47,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:47,873 INFO L85 PathProgramCache]: Analyzing trace with hash -995794511, now seen corresponding path program 23 times [2021-11-20 23:36:47,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:47,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165934944] [2021-11-20 23:36:47,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:47,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:47,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:48,337 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:48,337 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:48,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165934944] [2021-11-20 23:36:48,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165934944] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:48,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708294341] [2021-11-20 23:36:48,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:48,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:48,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:48,338 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:48,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:36:48,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:36:48,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:48,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 23:36:48,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:49,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:36:49,171 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:36:49,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:36:49,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:49,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2021-11-20 23:36:49,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:49,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 27 [2021-11-20 23:36:52,922 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:36:52,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 34 [2021-11-20 23:36:52,968 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:52,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:53,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:36:53,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:36:53,947 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:53,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708294341] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:53,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564528132] [2021-11-20 23:36:53,948 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:53,949 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:53,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:53,949 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:53,949 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:54,050 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:36:54,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:36:54,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:36:54,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:36:54,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,433 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:36:54,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:36:54,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:54,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 162 treesize of output 87 [2021-11-20 23:36:55,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 84 [2021-11-20 23:36:55,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 87 [2021-11-20 23:36:56,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:36:56,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:56,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:36:56,841 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:57,702 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:57,702 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:57,702 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 64 [2021-11-20 23:36:57,702 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125152573] [2021-11-20 23:36:57,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:57,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-20 23:36:57,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:57,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-20 23:36:57,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=4603, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:36:57,710 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 64 states, 64 states have (on average 1.796875) internal successors, (115), 64 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) [2021-11-20 23:37:10,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:10,225 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2021-11-20 23:37:10,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:37:10,226 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.796875) internal successors, (115), 64 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 40 [2021-11-20 23:37:10,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:10,227 INFO L225 Difference]: With dead ends: 74 [2021-11-20 23:37:10,227 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 23:37:10,228 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2160 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=752, Invalid=11238, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:37:10,229 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 74 mSDsluCounter, 450 mSDsCounter, 0 mSdLazyCounter, 886 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 1447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 434 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:10,229 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 468 Invalid, 1447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 886 Invalid, 0 Unknown, 434 Unchecked, 0.4s Time] [2021-11-20 23:37:10,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 23:37:10,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 43. [2021-11-20 23:37:10,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:10,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-11-20 23:37:10,246 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2021-11-20 23:37:10,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:10,247 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-11-20 23:37:10,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.796875) internal successors, (115), 64 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) [2021-11-20 23:37:10,247 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-11-20 23:37:10,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:37:10,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:10,247 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1] [2021-11-20 23:37:10,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:10,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:10,449 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:10,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:10,450 INFO L85 PathProgramCache]: Analyzing trace with hash 557819929, now seen corresponding path program 24 times [2021-11-20 23:37:10,450 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:10,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678210865] [2021-11-20 23:37:10,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:10,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:10,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:10,659 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:10,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:10,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678210865] [2021-11-20 23:37:10,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678210865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:10,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282852719] [2021-11-20 23:37:10,660 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:10,660 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:10,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:10,661 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:10,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:37:10,718 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:10,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:10,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:37:10,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:11,080 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:11,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:11,173 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:11,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282852719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:11,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931676342] [2021-11-20 23:37:11,175 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:37:11,175 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:11,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:11,175 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:11,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:11,280 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:37:11,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:37:11,346 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:37:11,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:37:11,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:37:11,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,600 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:11,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:11,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:11,706 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:37:11,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:37:12,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:12,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,200 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:37:12,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 285 [2021-11-20 23:37:12,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:12,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:37:13,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:37:13,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:13,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:37:14,636 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:15,132 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:15,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:15,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 34 [2021-11-20 23:37:15,133 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332986450] [2021-11-20 23:37:15,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:15,133 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:37:15,133 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:15,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:37:15,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1268, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:37:15,134 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:15,360 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-20 23:37:15,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:37:15,361 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2021-11-20 23:37:15,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:15,361 INFO L225 Difference]: With dead ends: 83 [2021-11-20 23:37:15,361 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:37:15,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=463, Invalid=1889, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:37:15,362 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 108 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:15,362 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 96 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:37:15,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:37:15,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2021-11-20 23:37:15,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 43 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-11-20 23:37:15,376 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 42 [2021-11-20 23:37:15,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:15,376 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-11-20 23:37:15,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.264705882352941) internal successors, (77), 34 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,376 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-11-20 23:37:15,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 23:37:15,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:15,377 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-20 23:37:15,397 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:15,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:37:15,577 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:15,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:15,578 INFO L85 PathProgramCache]: Analyzing trace with hash -369886653, now seen corresponding path program 25 times [2021-11-20 23:37:15,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:15,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904477069] [2021-11-20 23:37:15,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:15,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:15,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:16,043 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:16,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904477069] [2021-11-20 23:37:16,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904477069] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:16,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983326854] [2021-11-20 23:37:16,043 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:16,043 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:16,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:16,044 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:16,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:37:16,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:16,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 23:37:16,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:16,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:37:17,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:37:17,046 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:17,047 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:17,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:37:17,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:37:17,968 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 0 proven. 181 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:17,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983326854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:17,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [219941195] [2021-11-20 23:37:17,969 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:37:17,969 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:17,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:17,970 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:17,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:18,112 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:37:18,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:37:18,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:37:18,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:37:18,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:18,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:18,414 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:18,517 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:37:18,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:37:19,328 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:37:19,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:19,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:19,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:19,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:19,349 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:37:19,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 365 treesize of output 291 [2021-11-20 23:37:20,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 85 [2021-11-20 23:37:20,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:37:20,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:20,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:37:21,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:22,092 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:22,092 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:22,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 67 [2021-11-20 23:37:22,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639493371] [2021-11-20 23:37:22,093 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:22,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:37:22,093 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:22,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:37:22,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=5031, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:37:22,094 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:23,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:23,672 INFO L93 Difference]: Finished difference Result 83 states and 85 transitions. [2021-11-20 23:37:23,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:37:23,673 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2021-11-20 23:37:23,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:23,673 INFO L225 Difference]: With dead ends: 83 [2021-11-20 23:37:23,673 INFO L226 Difference]: Without dead ends: 81 [2021-11-20 23:37:23,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1472 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=424, Invalid=8318, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:37:23,674 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 37 mSDsluCounter, 453 mSDsCounter, 0 mSdLazyCounter, 1299 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 1348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:23,674 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 461 Invalid, 1348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1299 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:37:23,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-20 23:37:23,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 48. [2021-11-20 23:37:23,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:23,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-11-20 23:37:23,690 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 43 [2021-11-20 23:37:23,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:23,690 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-11-20 23:37:23,690 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.8507462686567164) internal successors, (124), 67 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:23,690 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-11-20 23:37:23,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:37:23,690 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:23,690 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-20 23:37:23,710 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:23,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 23:37:23,891 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:23,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:23,891 INFO L85 PathProgramCache]: Analyzing trace with hash 935980377, now seen corresponding path program 26 times [2021-11-20 23:37:23,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:23,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996989641] [2021-11-20 23:37:23,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:23,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:23,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:24,471 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:24,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:24,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996989641] [2021-11-20 23:37:24,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996989641] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:24,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219703422] [2021-11-20 23:37:24,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:24,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:24,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:24,473 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:24,489 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:37:25,536 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-11-20 23:37:25,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:25,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 23:37:25,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:25,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:37:26,003 INFO L354 Elim1Store]: treesize reduction 133, result has 21.8 percent of original size [2021-11-20 23:37:26,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 81 [2021-11-20 23:37:26,022 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:37:26,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:37:26,055 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:37:26,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 71 treesize of output 33 [2021-11-20 23:37:33,431 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:37:33,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 31 [2021-11-20 23:37:33,484 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:33,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:47,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2021-11-20 23:37:47,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 78 [2021-11-20 23:37:48,247 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:48,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219703422] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:48,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1010101576] [2021-11-20 23:37:48,248 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:37:48,248 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:48,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:48,249 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:48,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:48,350 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:37:48,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:37:48,408 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:37:48,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:37:48,530 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:37:48,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:48,800 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:37:48,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:37:49,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 78 [2021-11-20 23:37:49,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 78 [2021-11-20 23:37:49,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:49,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 187 treesize of output 96 [2021-11-20 23:37:50,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:37:50,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:50,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:37:51,170 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:52,014 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:52,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:52,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 70 [2021-11-20 23:37:52,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892955507] [2021-11-20 23:37:52,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:52,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-20 23:37:52,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:52,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-20 23:37:52,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=5440, Unknown=31, NotChecked=0, Total=5700 [2021-11-20 23:37:52,017 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 70 states, 70 states have (on average 1.8142857142857143) internal successors, (127), 70 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) [2021-11-20 23:38:26,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:26,573 INFO L93 Difference]: Finished difference Result 108 states and 111 transitions. [2021-11-20 23:38:26,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:38:26,574 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.8142857142857143) internal successors, (127), 70 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 44 [2021-11-20 23:38:26,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:26,574 INFO L225 Difference]: With dead ends: 108 [2021-11-20 23:38:26,574 INFO L226 Difference]: Without dead ends: 106 [2021-11-20 23:38:26,575 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 80 SyntacticMatches, 7 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1592 ImplicationChecksByTransitivity, 57.3s TimeCoverageRelationStatistics Valid=512, Invalid=9735, Unknown=55, NotChecked=0, Total=10302 [2021-11-20 23:38:26,575 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 49 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 230 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:26,576 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 408 Invalid, 909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 667 Invalid, 0 Unknown, 230 Unchecked, 0.3s Time] [2021-11-20 23:38:26,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-11-20 23:38:26,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 49. [2021-11-20 23:38:26,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:26,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2021-11-20 23:38:26,595 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2021-11-20 23:38:26,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:26,595 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2021-11-20 23:38:26,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.8142857142857143) internal successors, (127), 70 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) [2021-11-20 23:38:26,595 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2021-11-20 23:38:26,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:38:26,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:26,595 INFO L514 BasicCegarLoop]: trace histogram [12, 10, 9, 9, 1, 1, 1, 1, 1] [2021-11-20 23:38:26,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:26,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:38:26,796 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:26,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:26,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1531814653, now seen corresponding path program 27 times [2021-11-20 23:38:26,796 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:26,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861693929] [2021-11-20 23:38:26,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:26,797 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:26,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:27,354 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 204 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:27,354 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:27,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861693929] [2021-11-20 23:38:27,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [861693929] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:27,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728113594] [2021-11-20 23:38:27,355 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:27,355 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:27,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:27,356 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:27,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:38:27,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:27,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:27,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-20 23:38:27,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:27,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:38:27,881 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:38:27,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 75 [2021-11-20 23:38:27,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:27,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-11-20 23:38:27,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:27,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:27,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:27,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 10 [2021-11-20 23:38:28,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:28,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 77 treesize of output 68 [2021-11-20 23:38:28,171 INFO L354 Elim1Store]: treesize reduction 230, result has 19.3 percent of original size [2021-11-20 23:38:28,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 88 treesize of output 92 [2021-11-20 23:38:30,506 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:38:30,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 42 [2021-11-20 23:38:30,562 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 1 proven. 203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:30,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:38,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 47 [2021-11-20 23:38:38,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 396 treesize of output 392 [2021-11-20 23:38:38,970 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 0 proven. 204 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:38,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728113594] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:38,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1522591775] [2021-11-20 23:38:38,971 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:38:38,971 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:38,972 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:38,972 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:38,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:39,085 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:38:39,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:38:39,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:38:39,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:38:39,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:39,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:39,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:39,590 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:38:39,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:38:40,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:40,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:40,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:40,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:40,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:40,611 INFO L354 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2021-11-20 23:38:40,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 365 treesize of output 288 [2021-11-20 23:38:41,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:41,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:41,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:41,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:41,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:41,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 85 [2021-11-20 23:38:42,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:38:42,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:42,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:38:43,168 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:44,305 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:44,305 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:44,305 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 73 [2021-11-20 23:38:44,305 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92238396] [2021-11-20 23:38:44,306 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:44,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:38:44,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:44,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:38:44,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=5901, Unknown=6, NotChecked=0, Total=6162 [2021-11-20 23:38:44,307 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand has 73 states, 73 states have (on average 1.7808219178082192) internal successors, (130), 73 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:50,808 INFO L93 Difference]: Finished difference Result 82 states and 85 transitions. [2021-11-20 23:38:50,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-11-20 23:38:50,809 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.7808219178082192) internal successors, (130), 73 states have internal predecessors, (130), 0 states have call successors, (0), 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 45 [2021-11-20 23:38:50,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:50,811 INFO L225 Difference]: With dead ends: 82 [2021-11-20 23:38:50,811 INFO L226 Difference]: Without dead ends: 80 [2021-11-20 23:38:50,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 81 SyntacticMatches, 17 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2537 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=832, Invalid=13682, Unknown=6, NotChecked=0, Total=14520 [2021-11-20 23:38:50,812 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 57 mSDsluCounter, 769 mSDsCounter, 0 mSdLazyCounter, 945 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 790 SdHoareTripleChecker+Invalid, 1383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 381 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:50,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 790 Invalid, 1383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 945 Invalid, 0 Unknown, 381 Unchecked, 0.6s Time] [2021-11-20 23:38:50,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-20 23:38:50,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 47. [2021-11-20 23:38:50,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-11-20 23:38:50,836 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 45 [2021-11-20 23:38:50,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:50,836 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-11-20 23:38:50,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.7808219178082192) internal successors, (130), 73 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:50,836 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-11-20 23:38:50,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 23:38:50,836 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:50,837 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-20 23:38:50,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:51,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:51,037 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:51,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:51,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1598079089, now seen corresponding path program 28 times [2021-11-20 23:38:51,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:51,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298010380] [2021-11-20 23:38:51,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:51,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:51,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:51,322 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,322 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:51,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298010380] [2021-11-20 23:38:51,323 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298010380] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:51,323 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882740741] [2021-11-20 23:38:51,323 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:51,323 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:51,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:51,324 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:51,325 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:38:51,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:51,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:38:51,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:51,780 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:51,891 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:51,892 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882740741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:51,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041528861] [2021-11-20 23:38:51,892 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:38:51,892 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:51,893 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:51,893 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:51,893 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:52,015 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:38:52,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:38:52,078 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:38:52,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:38:52,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:38:52,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:52,507 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:38:52,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:38:53,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:53,039 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:38:53,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 296 [2021-11-20 23:38:54,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 90 [2021-11-20 23:38:54,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:38:54,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:54,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:38:55,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:56,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:56,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:56,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2021-11-20 23:38:56,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216568410] [2021-11-20 23:38:56,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:56,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:38:56,265 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:56,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:38:56,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=1465, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:38:56,266 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:56,571 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-11-20 23:38:56,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:38:56,571 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2021-11-20 23:38:56,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:56,572 INFO L225 Difference]: With dead ends: 90 [2021-11-20 23:38:56,572 INFO L226 Difference]: Without dead ends: 54 [2021-11-20 23:38:56,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 768 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=546, Invalid=2210, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:38:56,573 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 84 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:56,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 90 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:38:56,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-20 23:38:56,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2021-11-20 23:38:56,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-11-20 23:38:56,598 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 46 [2021-11-20 23:38:56,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:56,598 INFO L470 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-11-20 23:38:56,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.27027027027027) internal successors, (84), 37 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:56,598 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-11-20 23:38:56,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:38:56,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:56,599 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-20 23:38:56,619 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:56,801 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:56,801 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:38:56,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:56,802 INFO L85 PathProgramCache]: Analyzing trace with hash 869002651, now seen corresponding path program 29 times [2021-11-20 23:38:56,802 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:56,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381441797] [2021-11-20 23:38:56,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:56,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:56,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:57,558 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 0 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:38:57,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:57,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381441797] [2021-11-20 23:38:57,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381441797] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:57,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [167068413] [2021-11-20 23:38:57,559 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:57,559 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:57,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:57,561 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:57,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:38:58,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:38:58,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:58,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:38:58,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:59,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-20 23:39:00,311 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-20 23:39:00,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 42 [2021-11-20 23:39:00,366 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 145 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:00,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:01,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-20 23:39:01,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2021-11-20 23:39:02,540 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 135 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:02,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [167068413] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:02,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [979905339] [2021-11-20 23:39:02,542 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:39:02,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:02,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:02,542 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:02,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:02,675 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:39:02,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:39:02,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:39:02,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:39:02,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:02,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,005 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:03,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,010 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:03,137 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:39:03,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:39:03,970 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:03,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:03,986 INFO L354 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2021-11-20 23:39:03,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 365 treesize of output 284 [2021-11-20 23:39:04,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:04,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:04,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:04,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:04,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:04,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 151 treesize of output 82 [2021-11-20 23:39:05,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:39:05,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:05,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:39:06,854 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:07,855 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:07,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:07,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 73 [2021-11-20 23:39:07,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357582018] [2021-11-20 23:39:07,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:07,856 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:39:07,856 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:07,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:39:07,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=5480, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:39:07,857 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:09,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:09,951 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2021-11-20 23:39:09,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 23:39:09,951 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-20 23:39:09,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:09,952 INFO L225 Difference]: With dead ends: 85 [2021-11-20 23:39:09,952 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:39:09,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2386 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1231, Invalid=11201, Unknown=0, NotChecked=0, Total=12432 [2021-11-20 23:39:09,953 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 7 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 210 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 171 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:09,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 210 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 0 Unknown, 171 Unchecked, 0.1s Time] [2021-11-20 23:39:09,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:39:09,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-20 23:39:09,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0416666666666667) internal successors, (50), 48 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:09,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2021-11-20 23:39:09,973 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 47 [2021-11-20 23:39:09,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:09,973 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2021-11-20 23:39:09,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.8630136986301369) internal successors, (136), 73 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:09,973 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2021-11-20 23:39:09,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:39:09,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:09,974 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 10, 10, 1, 1, 1, 1, 1] [2021-11-20 23:39:09,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:10,174 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-20 23:39:10,174 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:10,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:10,175 INFO L85 PathProgramCache]: Analyzing trace with hash -257530447, now seen corresponding path program 30 times [2021-11-20 23:39:10,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:10,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425991086] [2021-11-20 23:39:10,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:10,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:10,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:10,977 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 0 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:10,977 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:10,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425991086] [2021-11-20 23:39:10,977 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425991086] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:10,977 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372528938] [2021-11-20 23:39:10,978 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:10,978 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:10,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:10,978 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:10,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:39:11,033 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:11,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:11,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-20 23:39:11,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:11,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:39:11,617 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:39:11,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:39:11,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:11,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:39:11,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:11,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:39:13,086 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:39:13,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 34 [2021-11-20 23:39:13,143 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 0 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:13,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:13,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:39:13,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:39:14,688 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 0 proven. 233 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:14,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372528938] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:14,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1890262513] [2021-11-20 23:39:14,689 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:39:14,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:14,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:14,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:14,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:14,837 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:39:14,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:39:14,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:39:14,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:14,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:39:15,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,270 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:39:15,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:39:15,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 81 [2021-11-20 23:39:15,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:15,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 81 [2021-11-20 23:39:16,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:16,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:16,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:16,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:16,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:16,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 180 treesize of output 93 [2021-11-20 23:39:17,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:39:17,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:17,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:39:18,282 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:19,381 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:19,381 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:19,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 76 [2021-11-20 23:39:19,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123426092] [2021-11-20 23:39:19,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:19,382 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2021-11-20 23:39:19,382 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:19,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-11-20 23:39:19,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=267, Invalid=6375, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:39:19,383 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 76 states, 76 states have (on average 1.8289473684210527) internal successors, (139), 76 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:22,553 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2021-11-20 23:39:22,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:39:22,553 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.8289473684210527) internal successors, (139), 76 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:39:22,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:22,554 INFO L225 Difference]: With dead ends: 60 [2021-11-20 23:39:22,554 INFO L226 Difference]: Without dead ends: 58 [2021-11-20 23:39:22,554 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 89 SyntacticMatches, 10 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1707 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=391, Invalid=8539, Unknown=0, NotChecked=0, Total=8930 [2021-11-20 23:39:22,554 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 38 mSDsluCounter, 499 mSDsCounter, 0 mSdLazyCounter, 644 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 511 SdHoareTripleChecker+Invalid, 775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 644 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:22,555 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 511 Invalid, 775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 644 Invalid, 0 Unknown, 126 Unchecked, 0.5s Time] [2021-11-20 23:39:22,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-20 23:39:22,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 52. [2021-11-20 23:39:22,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0392156862745099) internal successors, (53), 51 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-11-20 23:39:22,575 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 48 [2021-11-20 23:39:22,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:22,576 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-11-20 23:39:22,576 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.8289473684210527) internal successors, (139), 76 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:22,576 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-11-20 23:39:22,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-20 23:39:22,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:22,576 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-20 23:39:22,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:22,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-20 23:39:22,777 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:22,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:22,777 INFO L85 PathProgramCache]: Analyzing trace with hash -1272678845, now seen corresponding path program 31 times [2021-11-20 23:39:22,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:22,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200211509] [2021-11-20 23:39:22,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:22,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:22,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:23,514 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:23,515 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:23,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200211509] [2021-11-20 23:39:23,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200211509] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:23,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [574417373] [2021-11-20 23:39:23,515 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:23,515 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:23,515 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:23,516 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:23,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:39:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:23,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-20 23:39:23,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:24,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:39:24,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:39:25,034 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:25,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:25,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:39:25,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:39:26,574 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 0 proven. 265 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:26,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [574417373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:26,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1335799657] [2021-11-20 23:39:26,575 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:39:26,576 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:26,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:26,576 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:26,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:26,696 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:39:26,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:39:26,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:39:26,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:26,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:39:26,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,014 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:27,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:27,139 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:39:27,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:39:27,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:39:27,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:27,898 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:39:27,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 293 [2021-11-20 23:39:28,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:28,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:28,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:28,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:28,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:28,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 154 treesize of output 81 [2021-11-20 23:39:29,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:39:29,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:29,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:39:30,261 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:31,370 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:31,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:31,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 79 [2021-11-20 23:39:31,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322277690] [2021-11-20 23:39:31,370 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:31,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-20 23:39:31,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:31,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-20 23:39:31,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=6877, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:39:31,372 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:34,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:34,184 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2021-11-20 23:39:34,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-20 23:39:34,185 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-20 23:39:34,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:34,185 INFO L225 Difference]: With dead ends: 97 [2021-11-20 23:39:34,185 INFO L226 Difference]: Without dead ends: 95 [2021-11-20 23:39:34,186 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1987 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=500, Invalid=11490, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:39:34,186 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 22 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 2107 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 728 SdHoareTripleChecker+Invalid, 2138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 2107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:34,187 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 728 Invalid, 2138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 2107 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 23:39:34,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-20 23:39:34,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 56. [2021-11-20 23:39:34,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.0545454545454545) internal successors, (58), 55 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:34,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2021-11-20 23:39:34,224 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2021-11-20 23:39:34,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:34,225 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2021-11-20 23:39:34,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 1.8734177215189873) internal successors, (148), 79 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:34,225 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2021-11-20 23:39:34,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:39:34,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:34,226 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-20 23:39:34,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:34,446 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-20 23:39:34,446 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:34,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:34,446 INFO L85 PathProgramCache]: Analyzing trace with hash 272167769, now seen corresponding path program 32 times [2021-11-20 23:39:34,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:34,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788117300] [2021-11-20 23:39:34,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:34,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:34,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:35,277 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 0 proven. 278 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:35,277 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:35,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788117300] [2021-11-20 23:39:35,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788117300] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:35,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215554097] [2021-11-20 23:39:35,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:35,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:35,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:35,282 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:35,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 23:39:36,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-20 23:39:36,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:36,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 23:39:36,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:37,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-20 23:39:37,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:37,306 INFO L354 Elim1Store]: treesize reduction 110, result has 23.1 percent of original size [2021-11-20 23:39:37,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 79 treesize of output 89 [2021-11-20 23:39:37,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2021-11-20 23:39:37,373 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-20 23:39:37,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 39 treesize of output 23 [2021-11-20 23:39:37,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:37,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 18 [2021-11-20 23:39:37,434 INFO L354 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2021-11-20 23:39:37,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 69 treesize of output 29 [2021-11-20 23:39:40,601 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-11-20 23:39:40,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 71 treesize of output 50 [2021-11-20 23:39:40,667 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 176 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:40,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:43,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2021-11-20 23:39:43,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 114 treesize of output 107 [2021-11-20 23:39:44,408 INFO L134 CoverageAnalysis]: Checked inductivity of 278 backedges. 135 proven. 143 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:44,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215554097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:44,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997936261] [2021-11-20 23:39:44,409 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:39:44,409 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:44,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:44,409 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:44,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:44,513 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:39:44,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:39:44,597 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:39:44,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:39:44,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:39:44,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:44,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,087 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:39:45,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 374 treesize of output 430 [2021-11-20 23:39:45,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 150 treesize of output 84 [2021-11-20 23:39:45,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:45,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 162 treesize of output 87 [2021-11-20 23:39:46,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:46,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:46,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:46,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:46,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:46,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 87 [2021-11-20 23:39:47,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:39:47,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:47,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:39:47,909 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:49,028 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:49,028 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:49,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 82 [2021-11-20 23:39:49,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688921995] [2021-11-20 23:39:49,029 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:49,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2021-11-20 23:39:49,029 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:49,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2021-11-20 23:39:49,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=759, Invalid=6896, Unknown=1, NotChecked=0, Total=7656 [2021-11-20 23:39:49,030 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand has 82 states, 82 states have (on average 1.8414634146341464) internal successors, (151), 82 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:52,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:52,305 INFO L93 Difference]: Finished difference Result 128 states and 131 transitions. [2021-11-20 23:39:52,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:39:52,305 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 1.8414634146341464) internal successors, (151), 82 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2021-11-20 23:39:52,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:52,306 INFO L225 Difference]: With dead ends: 128 [2021-11-20 23:39:52,306 INFO L226 Difference]: Without dead ends: 54 [2021-11-20 23:39:52,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2426 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=1255, Invalid=11854, Unknown=1, NotChecked=0, Total=13110 [2021-11-20 23:39:52,308 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 339 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:52,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 351 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 82 Invalid, 0 Unknown, 75 Unchecked, 0.1s Time] [2021-11-20 23:39:52,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-20 23:39:52,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-20 23:39:52,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:52,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-11-20 23:39:52,351 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 52 [2021-11-20 23:39:52,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:52,351 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-11-20 23:39:52,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 1.8414634146341464) internal successors, (151), 82 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:52,352 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-11-20 23:39:52,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:39:52,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:52,353 INFO L514 BasicCegarLoop]: trace histogram [14, 12, 11, 11, 1, 1, 1, 1, 1] [2021-11-20 23:39:52,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:52,574 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 23:39:52,574 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:39:52,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:52,574 INFO L85 PathProgramCache]: Analyzing trace with hash 917772547, now seen corresponding path program 33 times [2021-11-20 23:39:52,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:52,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231874490] [2021-11-20 23:39:52,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:52,575 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:52,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:53,437 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 0 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:53,438 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:53,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231874490] [2021-11-20 23:39:53,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231874490] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:53,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333769830] [2021-11-20 23:39:53,438 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:39:53,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:53,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:53,439 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:53,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 23:39:53,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:39:53,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:53,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-20 23:39:53,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:54,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:39:54,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-20 23:39:54,167 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 23:39:54,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 50 [2021-11-20 23:39:54,474 INFO L354 Elim1Store]: treesize reduction 415, result has 18.9 percent of original size [2021-11-20 23:39:54,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 105 treesize of output 144 [2021-11-20 23:39:54,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 32 [2021-11-20 23:39:54,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 106 treesize of output 57 [2021-11-20 23:39:54,659 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:39:54,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 101 treesize of output 41 [2021-11-20 23:39:54,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:54,682 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:39:54,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 122 treesize of output 53 [2021-11-20 23:39:57,535 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:39:57,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 42 [2021-11-20 23:39:57,639 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 1 proven. 291 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:57,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:05,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 47 [2021-11-20 23:40:05,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 396 treesize of output 392 [2021-11-20 23:40:07,081 INFO L134 CoverageAnalysis]: Checked inductivity of 292 backedges. 0 proven. 292 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:07,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333769830] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:07,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [439612155] [2021-11-20 23:40:07,083 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:40:07,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:07,083 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:07,083 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:07,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:07,187 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:40:07,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:40:07,289 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:40:07,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:40:07,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:40:07,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:40:07,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:07,600 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:40:07,718 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:40:07,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:40:08,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:08,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:08,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 136 treesize of output 75 [2021-11-20 23:40:08,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:08,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:08,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:08,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 143 treesize of output 78 [2021-11-20 23:40:09,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 75 [2021-11-20 23:40:09,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:40:09,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:09,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:40:10,862 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:12,148 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:12,149 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:12,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 85 [2021-11-20 23:40:12,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674524239] [2021-11-20 23:40:12,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:12,150 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2021-11-20 23:40:12,150 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:12,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2021-11-20 23:40:12,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=7889, Unknown=7, NotChecked=0, Total=8190 [2021-11-20 23:40:12,150 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 85 states, 85 states have (on average 1.811764705882353) internal successors, (154), 85 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:15,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:15,382 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2021-11-20 23:40:15,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 23:40:15,383 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 1.811764705882353) internal successors, (154), 85 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-20 23:40:15,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:15,383 INFO L225 Difference]: With dead ends: 65 [2021-11-20 23:40:15,383 INFO L226 Difference]: Without dead ends: 63 [2021-11-20 23:40:15,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 98 SyntacticMatches, 11 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1815 ImplicationChecksByTransitivity, 15.3s TimeCoverageRelationStatistics Valid=440, Invalid=10895, Unknown=7, NotChecked=0, Total=11342 [2021-11-20 23:40:15,384 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 51 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 941 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 179 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:15,384 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 612 Invalid, 941 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 756 Invalid, 0 Unknown, 179 Unchecked, 0.5s Time] [2021-11-20 23:40:15,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-20 23:40:15,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 57. [2021-11-20 23:40:15,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:15,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2021-11-20 23:40:15,417 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 53 [2021-11-20 23:40:15,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:15,418 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2021-11-20 23:40:15,418 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 1.811764705882353) internal successors, (154), 85 states have internal predecessors, (154), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:15,418 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2021-11-20 23:40:15,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:40:15,419 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:15,419 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 12, 12, 1, 1, 1, 1, 1] [2021-11-20 23:40:15,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:15,629 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-20 23:40:15,629 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:15,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:15,630 INFO L85 PathProgramCache]: Analyzing trace with hash -394581583, now seen corresponding path program 34 times [2021-11-20 23:40:15,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:15,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126264420] [2021-11-20 23:40:15,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:15,630 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:15,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:16,754 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:16,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:16,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126264420] [2021-11-20 23:40:16,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126264420] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:16,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344648212] [2021-11-20 23:40:16,755 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:40:16,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:16,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:16,755 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:16,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 23:40:16,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:16,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-20 23:40:16,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:17,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:40:17,517 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:40:17,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:40:17,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:17,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2021-11-20 23:40:17,560 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:40:17,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 27 [2021-11-20 23:40:19,146 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:40:19,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 34 [2021-11-20 23:40:19,206 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:19,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:20,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:40:20,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:40:21,121 INFO L134 CoverageAnalysis]: Checked inductivity of 327 backedges. 0 proven. 327 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:21,121 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344648212] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:21,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184116083] [2021-11-20 23:40:21,122 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:40:21,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:21,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:21,123 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:21,123 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:21,244 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:40:21,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:40:21,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:40:21,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:40:21,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,720 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:21,819 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:40:21,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:40:22,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:22,465 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:40:22,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 288 [2021-11-20 23:40:23,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 166 treesize of output 87 [2021-11-20 23:40:23,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:40:23,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:23,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:40:24,816 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:25,963 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:25,963 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:25,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 88 [2021-11-20 23:40:25,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095993715] [2021-11-20 23:40:25,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:25,964 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2021-11-20 23:40:25,964 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:25,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2021-11-20 23:40:25,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=8391, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:40:25,966 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand has 88 states, 88 states have (on average 1.8522727272727273) internal successors, (163), 88 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:27,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:27,952 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2021-11-20 23:40:27,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-20 23:40:27,954 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 88 states have (on average 1.8522727272727273) internal successors, (163), 88 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:40:27,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:27,954 INFO L225 Difference]: With dead ends: 64 [2021-11-20 23:40:27,954 INFO L226 Difference]: Without dead ends: 62 [2021-11-20 23:40:27,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2846 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=495, Invalid=11277, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:40:27,956 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 26 mSDsluCounter, 745 mSDsCounter, 0 mSdLazyCounter, 813 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 759 SdHoareTripleChecker+Invalid, 941 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 813 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 124 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:27,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 759 Invalid, 941 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 813 Invalid, 0 Unknown, 124 Unchecked, 0.6s Time] [2021-11-20 23:40:27,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-20 23:40:27,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2021-11-20 23:40:27,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:27,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-11-20 23:40:27,986 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 56 [2021-11-20 23:40:27,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:27,986 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-11-20 23:40:27,986 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 88 states have (on average 1.8522727272727273) internal successors, (163), 88 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:27,986 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-11-20 23:40:27,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-20 23:40:27,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:27,987 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1] [2021-11-20 23:40:28,007 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:28,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:28,187 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:28,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:28,187 INFO L85 PathProgramCache]: Analyzing trace with hash 350827075, now seen corresponding path program 35 times [2021-11-20 23:40:28,188 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:28,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766412709] [2021-11-20 23:40:28,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:28,188 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:28,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:29,116 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:29,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:29,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766412709] [2021-11-20 23:40:29,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766412709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:29,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718739969] [2021-11-20 23:40:29,116 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:40:29,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:29,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:29,117 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:29,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 23:40:30,554 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:40:30,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:30,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:40:30,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:31,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-20 23:40:33,115 INFO L354 Elim1Store]: treesize reduction 13, result has 18.8 percent of original size [2021-11-20 23:40:33,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 42 [2021-11-20 23:40:33,181 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 247 proven. 118 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:33,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:34,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 25 [2021-11-20 23:40:34,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 40 [2021-11-20 23:40:36,324 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 234 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:36,324 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718739969] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:36,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216043547] [2021-11-20 23:40:36,325 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:40:36,325 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:36,326 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:36,326 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:36,326 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:36,442 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:40:36,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:40:36,562 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:40:36,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:40:36,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:40:36,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:36,945 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:40:36,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:40:37,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:37,279 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:40:37,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 303 [2021-11-20 23:40:38,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 175 treesize of output 93 [2021-11-20 23:40:38,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:40:38,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:38,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:40:40,082 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:41,213 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:41,214 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:41,214 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 91 [2021-11-20 23:40:41,214 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505022832] [2021-11-20 23:40:41,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:41,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-20 23:40:41,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:41,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-20 23:40:41,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1027, Invalid=8285, Unknown=0, NotChecked=0, Total=9312 [2021-11-20 23:40:41,216 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 91 states, 91 states have (on average 1.89010989010989) internal successors, (172), 91 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:44,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:44,361 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2021-11-20 23:40:44,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 23:40:44,361 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 1.89010989010989) internal successors, (172), 91 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-20 23:40:44,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:44,362 INFO L225 Difference]: With dead ends: 106 [2021-11-20 23:40:44,362 INFO L226 Difference]: Without dead ends: 61 [2021-11-20 23:40:44,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3682 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=1852, Invalid=17330, Unknown=0, NotChecked=0, Total=19182 [2021-11-20 23:40:44,364 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 8 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 185 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:44,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 346 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 102 Invalid, 0 Unknown, 185 Unchecked, 0.1s Time] [2021-11-20 23:40:44,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-20 23:40:44,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-20 23:40:44,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.0333333333333334) internal successors, (62), 60 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:44,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-11-20 23:40:44,400 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 59 [2021-11-20 23:40:44,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:44,400 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-11-20 23:40:44,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 1.89010989010989) internal successors, (172), 91 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:44,401 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-11-20 23:40:44,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:40:44,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:44,401 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 13, 13, 1, 1, 1, 1, 1] [2021-11-20 23:40:44,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:44,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 23:40:44,602 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:44,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:44,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1158822233, now seen corresponding path program 36 times [2021-11-20 23:40:44,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:44,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805615702] [2021-11-20 23:40:44,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:44,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:44,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:45,630 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:45,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:45,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805615702] [2021-11-20 23:40:45,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [805615702] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:45,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682087879] [2021-11-20 23:40:45,630 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:45,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:45,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:45,631 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:45,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 23:40:45,696 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:45,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:45,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-20 23:40:45,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:46,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:40:46,518 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:40:46,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:40:46,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:46,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 23 [2021-11-20 23:40:46,562 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:40:46,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 65 treesize of output 27 [2021-11-20 23:40:48,563 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:40:48,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 62 treesize of output 34 [2021-11-20 23:40:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:48,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:49,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:40:49,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:40:50,983 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:50,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682087879] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:50,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136628479] [2021-11-20 23:40:50,984 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:40:50,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:50,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:50,984 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:50,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:51,100 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:40:51,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:40:51,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:40:51,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:40:51,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,535 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:40:51,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:40:52,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,086 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:40:52,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 296 [2021-11-20 23:40:52,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:52,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 173 treesize of output 90 [2021-11-20 23:40:53,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:40:53,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:53,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:40:54,524 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:55,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:55,789 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:55,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 94 [2021-11-20 23:40:55,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517642524] [2021-11-20 23:40:55,789 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:55,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 94 states [2021-11-20 23:40:55,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:55,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2021-11-20 23:40:55,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=9573, Unknown=0, NotChecked=0, Total=9900 [2021-11-20 23:40:55,791 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 94 states, 94 states have (on average 1.8617021276595744) internal successors, (175), 94 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:59,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:59,037 INFO L93 Difference]: Finished difference Result 68 states and 69 transitions. [2021-11-20 23:40:59,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:40:59,038 INFO L78 Accepts]: Start accepts. Automaton has has 94 states, 94 states have (on average 1.8617021276595744) internal successors, (175), 94 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:40:59,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:59,038 INFO L225 Difference]: With dead ends: 68 [2021-11-20 23:40:59,038 INFO L226 Difference]: Without dead ends: 66 [2021-11-20 23:40:59,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 113 SyntacticMatches, 13 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2563 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=488, Invalid=13084, Unknown=0, NotChecked=0, Total=13572 [2021-11-20 23:40:59,039 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 36 mSDsluCounter, 738 mSDsCounter, 0 mSdLazyCounter, 904 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 754 SdHoareTripleChecker+Invalid, 1130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 904 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 216 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:59,040 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 754 Invalid, 1130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 904 Invalid, 0 Unknown, 216 Unchecked, 0.7s Time] [2021-11-20 23:40:59,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-20 23:40:59,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2021-11-20 23:40:59,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.0317460317460319) internal successors, (65), 63 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:59,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-11-20 23:40:59,073 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 60 [2021-11-20 23:40:59,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:59,073 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-11-20 23:40:59,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 94 states, 94 states have (on average 1.8617021276595744) internal successors, (175), 94 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:59,073 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-11-20 23:40:59,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-20 23:40:59,074 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:59,074 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1] [2021-11-20 23:40:59,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:59,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-20 23:40:59,297 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:59,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:59,298 INFO L85 PathProgramCache]: Analyzing trace with hash -468704869, now seen corresponding path program 37 times [2021-11-20 23:40:59,298 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:59,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386611993] [2021-11-20 23:40:59,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:59,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:59,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:00,275 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:00,275 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:00,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386611993] [2021-11-20 23:41:00,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386611993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:00,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1553914349] [2021-11-20 23:41:00,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:00,275 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:00,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:00,276 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:00,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-20 23:41:00,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:00,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-20 23:41:00,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:01,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-11-20 23:41:02,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 28 [2021-11-20 23:41:02,484 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:02,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:03,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 14 [2021-11-20 23:41:03,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:41:04,756 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 421 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:04,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1553914349] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:04,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276985698] [2021-11-20 23:41:04,757 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:41:04,757 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:04,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:04,758 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:04,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:04,894 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:41:04,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:41:04,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:41:05,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:41:05,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,205 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:05,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:05,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:05,345 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:41:05,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:41:06,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 122 treesize of output 69 [2021-11-20 23:41:06,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 18 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 115 treesize of output 66 [2021-11-20 23:41:06,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:06,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 84 [2021-11-20 23:41:07,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:41:07,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:07,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:41:08,418 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:09,761 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:09,761 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:09,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 97 [2021-11-20 23:41:09,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426541280] [2021-11-20 23:41:09,762 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:09,762 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-20 23:41:09,762 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:09,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-20 23:41:09,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=10186, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 23:41:09,763 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 97 states, 97 states have (on average 1.8969072164948453) internal successors, (184), 97 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:13,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:13,947 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-11-20 23:41:13,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-11-20 23:41:13,948 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.8969072164948453) internal successors, (184), 97 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2021-11-20 23:41:13,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:13,949 INFO L225 Difference]: With dead ends: 118 [2021-11-20 23:41:13,949 INFO L226 Difference]: Without dead ends: 116 [2021-11-20 23:41:13,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=614, Invalid=17208, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:41:13,950 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 25 mSDsluCounter, 1105 mSDsCounter, 0 mSdLazyCounter, 3232 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1118 SdHoareTripleChecker+Invalid, 3269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 3232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:13,950 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 1118 Invalid, 3269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 3232 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2021-11-20 23:41:13,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-20 23:41:13,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 68. [2021-11-20 23:41:13,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:13,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-11-20 23:41:13,981 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2021-11-20 23:41:13,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:13,981 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-11-20 23:41:13,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.8969072164948453) internal successors, (184), 97 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:13,981 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-11-20 23:41:13,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-20 23:41:13,982 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:13,982 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 14, 14, 1, 1, 1, 1, 1] [2021-11-20 23:41:14,002 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:14,182 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 23:41:14,182 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:14,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:14,183 INFO L85 PathProgramCache]: Analyzing trace with hash 999534001, now seen corresponding path program 38 times [2021-11-20 23:41:14,183 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:14,183 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70130476] [2021-11-20 23:41:14,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:14,183 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:14,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:15,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:15,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70130476] [2021-11-20 23:41:15,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70130476] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:15,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699272372] [2021-11-20 23:41:15,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:15,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:15,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:15,265 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:15,266 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-20 23:41:17,607 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-20 23:41:17,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:17,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-20 23:41:17,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:18,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-20 23:41:18,614 INFO L354 Elim1Store]: treesize reduction 153, result has 21.5 percent of original size [2021-11-20 23:41:18,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 76 treesize of output 84 [2021-11-20 23:41:18,635 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:41:18,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 25 [2021-11-20 23:41:18,694 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:41:18,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 19 [2021-11-20 23:41:18,707 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:41:18,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 74 treesize of output 30 [2021-11-20 23:41:22,634 INFO L354 Elim1Store]: treesize reduction 48, result has 5.9 percent of original size [2021-11-20 23:41:22,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 48 [2021-11-20 23:41:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 287 proven. 150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:22,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:25,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 36 [2021-11-20 23:41:25,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 114 treesize of output 107 [2021-11-20 23:41:27,510 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 234 proven. 203 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:27,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699272372] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:27,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [726989607] [2021-11-20 23:41:27,511 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:41:27,511 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:27,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:27,511 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:27,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:27,610 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:41:27,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:41:27,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:41:27,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:41:27,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,964 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:27,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:27,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:28,077 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:41:28,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 29 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 366 treesize of output 447 [2021-11-20 23:41:28,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:28,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:28,918 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:28,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 18 disjoint index pairs (out of 45 index pairs), introduced 9 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-20 23:41:29,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 0 case distinctions, treesize of input 140 treesize of output 79 [2021-11-20 23:41:29,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:29,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 21 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 158 treesize of output 85 [2021-11-20 23:41:30,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:41:30,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:30,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:41:31,448 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:32,772 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:32,772 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:32,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 100 [2021-11-20 23:41:32,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893007768] [2021-11-20 23:41:32,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:32,773 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2021-11-20 23:41:32,773 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:32,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2021-11-20 23:41:32,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1215, Invalid=9913, Unknown=2, NotChecked=0, Total=11130 [2021-11-20 23:41:32,774 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 100 states, 100 states have (on average 1.87) internal successors, (187), 100 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:37,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:37,091 INFO L93 Difference]: Finished difference Result 158 states and 161 transitions. [2021-11-20 23:41:37,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 23:41:37,091 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 100 states have (on average 1.87) internal successors, (187), 100 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2021-11-20 23:41:37,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:37,092 INFO L225 Difference]: With dead ends: 158 [2021-11-20 23:41:37,092 INFO L226 Difference]: Without dead ends: 66 [2021-11-20 23:41:37,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3596 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=1921, Invalid=17258, Unknown=3, NotChecked=0, Total=19182 [2021-11-20 23:41:37,094 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 19 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 434 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 70 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:37,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 434 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 89 Invalid, 0 Unknown, 70 Unchecked, 0.1s Time] [2021-11-20 23:41:37,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-20 23:41:37,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-11-20 23:41:37,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:37,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-11-20 23:41:37,132 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 64 [2021-11-20 23:41:37,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:37,132 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-11-20 23:41:37,132 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 100 states have (on average 1.87) internal successors, (187), 100 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:37,132 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-11-20 23:41:37,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 23:41:37,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:37,132 INFO L514 BasicCegarLoop]: trace histogram [17, 15, 14, 14, 1, 1, 1, 1, 1] [2021-11-20 23:41:37,154 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:37,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:37,333 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:41:37,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:37,333 INFO L85 PathProgramCache]: Analyzing trace with hash -729701285, now seen corresponding path program 39 times [2021-11-20 23:41:37,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:37,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840860165] [2021-11-20 23:41:37,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:37,334 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:37,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:38,898 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 0 proven. 454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:38,898 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:38,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840860165] [2021-11-20 23:41:38,899 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840860165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:38,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481321657] [2021-11-20 23:41:38,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:41:38,899 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:38,899 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:38,900 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:38,901 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-20 23:41:38,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:41:38,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:38,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-20 23:41:38,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:39,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:41:39,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:39,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-20 23:41:39,900 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 23:41:39,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 50 [2021-11-20 23:41:40,263 INFO L354 Elim1Store]: treesize reduction 415, result has 18.9 percent of original size [2021-11-20 23:41:40,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 122 treesize of output 147 [2021-11-20 23:41:40,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 32 [2021-11-20 23:41:40,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 75 treesize of output 44 [2021-11-20 23:41:40,464 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:41:40,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 101 treesize of output 41 [2021-11-20 23:41:40,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:40,493 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:41:40,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 153 treesize of output 66 [2021-11-20 23:41:44,687 INFO L354 Elim1Store]: treesize reduction 44, result has 2.2 percent of original size [2021-11-20 23:41:44,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 86 treesize of output 42 [2021-11-20 23:41:44,774 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 1 proven. 453 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:44,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:54,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 47 [2021-11-20 23:41:54,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 3254 treesize of output 3222 [2021-11-20 23:41:58,012 INFO L134 CoverageAnalysis]: Checked inductivity of 454 backedges. 0 proven. 454 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:41:58,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481321657] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:58,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826615616] [2021-11-20 23:41:58,013 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:41:58,013 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:58,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:58,014 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:58,014 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:58,142 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:41:58,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:41:58,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:41:58,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 104 [2021-11-20 23:41:58,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:58,586 INFO L354 Elim1Store]: treesize reduction 349, result has 11.0 percent of original size [2021-11-20 23:41:58,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 32 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 23 case distinctions, treesize of input 378 treesize of output 434 [2021-11-20 23:41:59,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:59,188 INFO L354 Elim1Store]: treesize reduction 102, result has 1.0 percent of original size [2021-11-20 23:41:59,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 24 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 16 case distinctions, treesize of input 378 treesize of output 287 [2021-11-20 23:42:00,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 87 [2021-11-20 23:42:00,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:42:00,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:00,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:42:01,522 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:03,001 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:03,002 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:03,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 103 [2021-11-20 23:42:03,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264151587] [2021-11-20 23:42:03,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:03,002 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2021-11-20 23:42:03,002 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:03,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2021-11-20 23:42:03,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=11415, Unknown=6, NotChecked=0, Total=11772 [2021-11-20 23:42:03,003 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 103 states, 103 states have (on average 1.8446601941747574) internal successors, (190), 103 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:07,808 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2021-11-20 23:42:07,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:42:07,808 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 1.8446601941747574) internal successors, (190), 103 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2021-11-20 23:42:07,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:07,809 INFO L225 Difference]: With dead ends: 73 [2021-11-20 23:42:07,809 INFO L226 Difference]: Without dead ends: 71 [2021-11-20 23:42:07,809 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 122 SyntacticMatches, 14 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2576 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=529, Invalid=15977, Unknown=6, NotChecked=0, Total=16512 [2021-11-20 23:42:07,810 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 44 mSDsluCounter, 1061 mSDsCounter, 0 mSdLazyCounter, 1075 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 1077 SdHoareTripleChecker+Invalid, 1270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 1075 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 192 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:07,810 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 1077 Invalid, 1270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 1075 Invalid, 0 Unknown, 192 Unchecked, 0.8s Time] [2021-11-20 23:42:07,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-20 23:42:07,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-11-20 23:42:07,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2021-11-20 23:42:07,853 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 65 [2021-11-20 23:42:07,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:07,853 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2021-11-20 23:42:07,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 1.8446601941747574) internal successors, (190), 103 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:07,853 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2021-11-20 23:42:07,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:42:07,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:07,854 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-20 23:42:07,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:08,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-20 23:42:08,054 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:08,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:08,055 INFO L85 PathProgramCache]: Analyzing trace with hash -1696219303, now seen corresponding path program 40 times [2021-11-20 23:42:08,055 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:08,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1876704501] [2021-11-20 23:42:08,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:08,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:08,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:09,197 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:09,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:09,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1876704501] [2021-11-20 23:42:09,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1876704501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:09,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417663563] [2021-11-20 23:42:09,198 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:42:09,198 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:09,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:09,199 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:09,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-20 23:42:09,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:09,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-20 23:42:09,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:10,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:42:10,322 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-20 23:42:10,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 73 treesize of output 75 [2021-11-20 23:42:10,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:10,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2021-11-20 23:42:10,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:10,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 27 [2021-11-20 23:42:12,679 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-20 23:42:12,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 34 [2021-11-20 23:42:12,761 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:12,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:14,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:42:14,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 87 treesize of output 83 [2021-11-20 23:42:15,768 INFO L134 CoverageAnalysis]: Checked inductivity of 498 backedges. 0 proven. 498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:15,768 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417663563] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:15,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411668511] [2021-11-20 23:42:15,770 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:42:15,770 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:15,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:15,770 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:15,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:15,894 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:42:15,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:42:15,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:42:16,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 19 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:42:16,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,233 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:16,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:16,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:16,352 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:42:16,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:42:17,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:17,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,135 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:42:17,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 301 [2021-11-20 23:42:17,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:17,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 161 treesize of output 84 [2021-11-20 23:42:18,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:42:18,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:18,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 23:42:19,820 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:21,175 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:21,175 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:21,175 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 106 [2021-11-20 23:42:21,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658647340] [2021-11-20 23:42:21,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:21,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-20 23:42:21,176 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:21,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-20 23:42:21,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=12065, Unknown=0, NotChecked=0, Total=12432 [2021-11-20 23:42:21,177 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand has 106 states, 106 states have (on average 1.8773584905660377) internal successors, (199), 106 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:25,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:25,146 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-11-20 23:42:25,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 23:42:25,146 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 106 states have (on average 1.8773584905660377) internal successors, (199), 106 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:42:25,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:25,147 INFO L225 Difference]: With dead ends: 120 [2021-11-20 23:42:25,147 INFO L226 Difference]: Without dead ends: 118 [2021-11-20 23:42:25,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 129 SyntacticMatches, 15 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3167 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=560, Invalid=16470, Unknown=0, NotChecked=0, Total=17030 [2021-11-20 23:42:25,148 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 61 mSDsluCounter, 1122 mSDsCounter, 0 mSdLazyCounter, 1101 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 1138 SdHoareTripleChecker+Invalid, 1236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 133 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:25,148 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 1138 Invalid, 1236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1101 Invalid, 0 Unknown, 133 Unchecked, 0.8s Time] [2021-11-20 23:42:25,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-20 23:42:25,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 73. [2021-11-20 23:42:25,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:25,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-11-20 23:42:25,185 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2021-11-20 23:42:25,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:25,185 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-11-20 23:42:25,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 106 states have (on average 1.8773584905660377) internal successors, (199), 106 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:25,186 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-11-20 23:42:25,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-20 23:42:25,186 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:25,187 INFO L514 BasicCegarLoop]: trace histogram [18, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-20 23:42:25,207 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:25,388 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-11-20 23:42:25,388 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:25,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:25,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1992011517, now seen corresponding path program 41 times [2021-11-20 23:42:25,388 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:25,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991255880] [2021-11-20 23:42:25,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:25,389 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:25,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:26,621 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 0 proven. 516 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:26,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:26,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991255880] [2021-11-20 23:42:26,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991255880] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:26,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450767841] [2021-11-20 23:42:26,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:42:26,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:26,622 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:26,624 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:26,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-20 23:42:31,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-11-20 23:42:31,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:31,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 23:42:31,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:31,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 20 [2021-11-20 23:42:32,146 INFO L354 Elim1Store]: treesize reduction 153, result has 21.5 percent of original size [2021-11-20 23:42:32,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 84 [2021-11-20 23:42:32,161 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:42:32,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 51 treesize of output 26 [2021-11-20 23:42:32,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:32,258 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:42:32,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 38 [2021-11-20 23:42:32,638 INFO L354 Elim1Store]: treesize reduction 305, result has 24.5 percent of original size [2021-11-20 23:42:32,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 118 treesize of output 154 [2021-11-20 23:42:32,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:32,688 INFO L354 Elim1Store]: treesize reduction 32, result has 8.6 percent of original size [2021-11-20 23:42:32,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 119 treesize of output 60 [2021-11-20 23:42:32,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:32,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:32,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:32,803 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-20 23:42:32,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 136 treesize of output 128 [2021-11-20 23:42:37,673 INFO L354 Elim1Store]: treesize reduction 100, result has 2.9 percent of original size [2021-11-20 23:42:37,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 100 treesize of output 51 [2021-11-20 23:42:37,767 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 330 proven. 186 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:37,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:43,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 53 [2021-11-20 23:42:43,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 975 treesize of output 963 [2021-11-20 23:42:45,603 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 315 proven. 201 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:42:45,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450767841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:45,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [772598868] [2021-11-20 23:42:45,604 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:42:45,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:45,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:45,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:45,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:45,720 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-20 23:42:45,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 24 treesize of output 44 [2021-11-20 23:42:45,824 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-20 23:42:45,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-20 23:42:45,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:45,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 20 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 97 [2021-11-20 23:42:46,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,107 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:46,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,112 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:46,231 INFO L354 Elim1Store]: treesize reduction 417, result has 16.8 percent of original size [2021-11-20 23:42:46,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 10 select indices, 10 select index equivalence classes, 30 disjoint index pairs (out of 45 index pairs), introduced 12 new quantified variables, introduced 27 case distinctions, treesize of input 370 treesize of output 451 [2021-11-20 23:42:46,790 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:42:46,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:46,814 INFO L354 Elim1Store]: treesize reduction 78, result has 3.7 percent of original size [2021-11-20 23:42:46,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 19 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 17 case distinctions, treesize of input 359 treesize of output 285 [2021-11-20 23:42:47,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:47,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:47,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:47,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:47,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:47,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 20 disjoint index pairs (out of 55 index pairs), introduced 11 new quantified variables, introduced 0 case distinctions, treesize of input 147 treesize of output 78 [2021-11-20 23:42:48,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-11-20 23:42:48,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:48,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 35 [2021-11-20 23:42:49,679 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:51,037 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:51,037 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:51,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 109 [2021-11-20 23:42:51,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462380136] [2021-11-20 23:42:51,038 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:51,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-20 23:42:51,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:51,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-20 23:42:51,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1429, Invalid=11678, Unknown=3, NotChecked=0, Total=13110 [2021-11-20 23:42:51,039 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 109 states, 109 states have (on average 1.853211009174312) internal successors, (202), 109 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:59,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:59,675 INFO L93 Difference]: Finished difference Result 217 states and 222 transitions. [2021-11-20 23:42:59,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2021-11-20 23:42:59,676 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 1.853211009174312) internal successors, (202), 109 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2021-11-20 23:42:59,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:59,676 INFO L225 Difference]: With dead ends: 217 [2021-11-20 23:42:59,676 INFO L226 Difference]: Without dead ends: 72 [2021-11-20 23:42:59,677 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 158 SyntacticMatches, 1 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6441 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=3098, Invalid=29841, Unknown=3, NotChecked=0, Total=32942 [2021-11-20 23:42:59,678 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 646 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:59,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 660 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 130 Invalid, 0 Unknown, 150 Unchecked, 0.1s Time] [2021-11-20 23:42:59,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-11-20 23:42:59,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-11-20 23:42:59,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:59,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2021-11-20 23:42:59,718 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 69 [2021-11-20 23:42:59,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:59,718 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2021-11-20 23:42:59,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 1.853211009174312) internal successors, (202), 109 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:59,718 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2021-11-20 23:42:59,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-20 23:42:59,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:59,718 INFO L514 BasicCegarLoop]: trace histogram [20, 16, 15, 15, 1, 1, 1, 1, 1] [2021-11-20 23:42:59,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:59,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:59,919 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:42:59,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:59,919 INFO L85 PathProgramCache]: Analyzing trace with hash 934855619, now seen corresponding path program 42 times [2021-11-20 23:42:59,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:59,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296122583] [2021-11-20 23:42:59,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:59,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:59,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:01,430 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 1 proven. 554 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:43:01,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:01,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296122583] [2021-11-20 23:43:01,431 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296122583] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:01,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430307855] [2021-11-20 23:43:01,431 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:43:01,431 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:01,431 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:01,432 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:01,433 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a2c1d687-e4a8-4ecd-91d1-5551beb93cef/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-20 23:43:01,511 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:43:01,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:01,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-20 23:43:01,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:02,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-20 23:43:02,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:02,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 25 [2021-11-20 23:43:02,595 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-20 23:43:02,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 54 treesize of output 50 [2021-11-20 23:43:02,970 INFO L354 Elim1Store]: treesize reduction 415, result has 18.9 percent of original size [2021-11-20 23:43:02,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 101 treesize of output 158 [2021-11-20 23:43:03,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 30 [2021-11-20 23:43:03,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,114 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:03,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 102 treesize of output 45 [2021-11-20 23:43:03,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,254 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:03,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 42 [2021-11-20 23:43:03,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,467 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:03,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 1 case distinctions, treesize of input 76 treesize of output 39 [2021-11-20 23:43:03,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:03,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 27 [2021-11-20 23:43:05,491 INFO L354 Elim1Store]: treesize reduction 779, result has 15.5 percent of original size [2021-11-20 23:43:05,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 287 treesize of output 273 [2021-11-20 23:43:05,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:43:05,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:05,744 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:05,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 9 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 128 treesize of output 65 [2021-11-20 23:43:05,876 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:43:06,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,072 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-20 23:43:06,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 13 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 2 case distinctions, treesize of input 140 treesize of output 68 [2021-11-20 23:43:06,211 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:43:06,321 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:43:06,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:43:06,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:06,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 50 [2021-11-20 23:43:07,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,032 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:07,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 9 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 1 case distinctions, treesize of input 107 treesize of output 53 [2021-11-20 23:43:07,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,649 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-20 23:43:07,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 141 treesize of output 68 [2021-11-20 23:43:07,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,696 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-20 23:43:07,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 141 treesize of output 68 [2021-11-20 23:43:07,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 99 treesize of output 44 [2021-11-20 23:43:07,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:07,838 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:07,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 14 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 56 [2021-11-20 23:43:08,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,050 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:08,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 14 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 56 [2021-11-20 23:43:08,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,108 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:08,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 14 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 120 treesize of output 56 [2021-11-20 23:43:08,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,350 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:08,356 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-20 23:43:08,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 19 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 141 treesize of output 68 [2021-11-20 23:43:12,915 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:43:12,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:12,970 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-20 23:43:12,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 26 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 2 case distinctions, treesize of input 110 treesize of output 109 [2021-11-20 23:43:13,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,218 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:13,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 20 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 94 [2021-11-20 23:43:13,421 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-20 23:43:13,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 15 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 79 [2021-11-20 23:43:13,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:13,789 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-20 23:43:13,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 20 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 94 [2021-11-20 23:43:14,571 INFO L354 Elim1Store]: treesize reduction 746, result has 11.9 percent of original size [2021-11-20 23:43:14,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 669 treesize of output 309