./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/rewnif.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/rewnif.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5ee21d1db2a363655b71bcb8ab92ef8d6b86a57a4ebbd79d98cb55c59d3ed1f5 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:51:20,295 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:51:20,298 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:51:20,360 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:51:20,361 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:51:20,365 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:51:20,367 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:51:20,371 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:51:20,374 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:51:20,382 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:51:20,383 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:51:20,385 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:51:20,386 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:51:20,388 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:51:20,391 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:51:20,400 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:51:20,402 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:51:20,403 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:51:20,405 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:51:20,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:51:20,417 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:51:20,419 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:51:20,422 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:51:20,424 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:51:20,427 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:51:20,428 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:51:20,428 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:51:20,431 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:51:20,431 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:51:20,433 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:51:20,433 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:51:20,434 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:51:20,436 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:51:20,437 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:51:20,439 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:51:20,439 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:51:20,440 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:51:20,440 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:51:20,440 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:51:20,441 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:51:20,442 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:51:20,444 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:51:20,497 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:51:20,497 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:51:20,498 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:51:20,498 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:51:20,505 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:51:20,505 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:51:20,506 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:51:20,506 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:51:20,506 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:51:20,506 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:51:20,508 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:51:20,508 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:51:20,508 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:51:20,508 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:51:20,509 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:51:20,509 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:51:20,509 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:51:20,509 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:51:20,510 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:51:20,511 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:51:20,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:51:20,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:51:20,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:51:20,511 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:51:20,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:51:20,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:51:20,514 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:51:20,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:51:20,515 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:51:20,515 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:51:20,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:51:20,516 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:51:20,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:51:20,516 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:51:20,516 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:51:20,517 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:51:20,517 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:51:20,517 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:51:20,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:51:20,518 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:51:20,518 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:51:20,518 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_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5ee21d1db2a363655b71bcb8ab92ef8d6b86a57a4ebbd79d98cb55c59d3ed1f5 [2021-11-23 02:51:20,834 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:51:20,863 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:51:20,865 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:51:20,866 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:51:20,867 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:51:20,868 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-tiling/rewnif.c [2021-11-23 02:51:20,942 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/data/2d3244b1c/6d4f589a43f74e9fbaceb5890cbd022d/FLAGc1f59bad7 [2021-11-23 02:51:21,393 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:51:21,393 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/sv-benchmarks/c/array-tiling/rewnif.c [2021-11-23 02:51:21,399 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/data/2d3244b1c/6d4f589a43f74e9fbaceb5890cbd022d/FLAGc1f59bad7 [2021-11-23 02:51:21,784 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/data/2d3244b1c/6d4f589a43f74e9fbaceb5890cbd022d [2021-11-23 02:51:21,786 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:51:21,788 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:51:21,789 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:51:21,790 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:51:21,793 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:51:21,794 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:51:21" (1/1) ... [2021-11-23 02:51:21,795 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e7de9de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:21, skipping insertion in model container [2021-11-23 02:51:21,795 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:51:21" (1/1) ... [2021-11-23 02:51:21,802 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:51:21,815 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:51:21,972 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_38f13b3c-f282-43f4-9712-ed42ea83eb40/sv-benchmarks/c/array-tiling/rewnif.c[397,410] [2021-11-23 02:51:21,996 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:51:22,006 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:51:22,020 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_38f13b3c-f282-43f4-9712-ed42ea83eb40/sv-benchmarks/c/array-tiling/rewnif.c[397,410] [2021-11-23 02:51:22,031 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:51:22,057 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:51:22,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22 WrapperNode [2021-11-23 02:51:22,058 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:51:22,059 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:51:22,060 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:51:22,060 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:51:22,068 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,076 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,098 INFO L137 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 49 [2021-11-23 02:51:22,098 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:51:22,099 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:51:22,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:51:22,100 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:51:22,109 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,109 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,121 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,127 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,134 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,141 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,147 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:51:22,148 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:51:22,149 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:51:22,149 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:51:22,150 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (1/1) ... [2021-11-23 02:51:22,159 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:51:22,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:22,187 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:51:22,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:51:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:51:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:51:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:51:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:51:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:51:22,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:51:22,242 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:51:22,312 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:51:22,314 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:51:22,478 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:51:22,522 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:51:22,523 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:51:22,525 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:51:22 BoogieIcfgContainer [2021-11-23 02:51:22,525 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:51:22,546 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:51:22,546 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:51:22,550 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:51:22,550 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:51:21" (1/3) ... [2021-11-23 02:51:22,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e98b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:51:22, skipping insertion in model container [2021-11-23 02:51:22,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:51:22" (2/3) ... [2021-11-23 02:51:22,551 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52e98b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:51:22, skipping insertion in model container [2021-11-23 02:51:22,551 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:51:22" (3/3) ... [2021-11-23 02:51:22,553 INFO L111 eAbstractionObserver]: Analyzing ICFG rewnif.c [2021-11-23 02:51:22,558 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:51:22,558 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:51:22,615 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:51:22,622 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:51:22,623 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:51:22,636 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) [2021-11-23 02:51:22,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:51:22,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:22,642 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:51:22,642 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:22,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:22,648 INFO L85 PathProgramCache]: Analyzing trace with hash -1683096884, now seen corresponding path program 1 times [2021-11-23 02:51:22,657 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:22,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419145884] [2021-11-23 02:51:22,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:22,659 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:22,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:22,823 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:22,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:22,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419145884] [2021-11-23 02:51:22,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419145884] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:22,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:22,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:51:22,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258887978] [2021-11-23 02:51:22,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:22,832 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:51:22,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:22,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:51:22,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:22,863 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) [2021-11-23 02:51:22,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:22,899 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-23 02:51:22,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:51:22,902 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 [2021-11-23 02:51:22,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:22,909 INFO L225 Difference]: With dead ends: 18 [2021-11-23 02:51:22,910 INFO L226 Difference]: Without dead ends: 9 [2021-11-23 02:51:22,912 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 [2021-11-23 02:51:22,916 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 [2021-11-23 02:51:22,918 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] [2021-11-23 02:51:22,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-23 02:51:22,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-23 02:51:22,968 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) [2021-11-23 02:51:22,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-23 02:51:22,971 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-23 02:51:22,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:22,972 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-23 02:51:22,972 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) [2021-11-23 02:51:22,975 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-23 02:51:22,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:51:22,976 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:22,976 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:22,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:51:22,978 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:22,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:22,983 INFO L85 PathProgramCache]: Analyzing trace with hash -637292488, now seen corresponding path program 1 times [2021-11-23 02:51:22,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:22,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295852216] [2021-11-23 02:51:22,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:22,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:23,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:23,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:23,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:23,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295852216] [2021-11-23 02:51:23,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295852216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:23,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855244332] [2021-11-23 02:51:23,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:23,086 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:23,086 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:23,091 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:23,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:51:23,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:23,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:51:23,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:23,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:23,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:23,297 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:23,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855244332] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:23,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1748222717] [2021-11-23 02:51:23,319 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:51:23,320 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:23,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:23,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:23,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:23,491 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:23,492 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 [2021-11-23 02:51:23,527 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 [2021-11-23 02:51:23,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:23,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:23,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 19 [2021-11-23 02:51:23,809 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:24,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,084 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:24,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:24,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,222 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 72 treesize of output 38 [2021-11-23 02:51:24,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,288 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 72 treesize of output 38 [2021-11-23 02:51:24,431 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:24,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 42 [2021-11-23 02:51:24,608 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 [2021-11-23 02:51:24,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:24,615 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 [2021-11-23 02:51:24,641 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:24,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 100000) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:24,861 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:24,861 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:24,861 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-23 02:51:24,863 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229187370] [2021-11-23 02:51:24,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:24,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:51:24,864 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:24,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:51:24,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:51:24,866 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) [2021-11-23 02:51:24,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:24,919 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-11-23 02:51:24,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:51:24,919 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 [2021-11-23 02:51:24,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:24,920 INFO L225 Difference]: With dead ends: 15 [2021-11-23 02:51:24,920 INFO L226 Difference]: Without dead ends: 10 [2021-11-23 02:51:24,923 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 [2021-11-23 02:51:24,929 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 [2021-11-23 02:51:24,930 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] [2021-11-23 02:51:24,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-23 02:51:24,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-23 02:51:24,936 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) [2021-11-23 02:51:24,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-23 02:51:24,936 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-23 02:51:24,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:24,937 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-23 02:51:24,938 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) [2021-11-23 02:51:24,938 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-23 02:51:24,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:51:24,939 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:24,939 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:24,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:25,157 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:25,158 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:25,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:25,159 INFO L85 PathProgramCache]: Analyzing trace with hash 1717872716, now seen corresponding path program 2 times [2021-11-23 02:51:25,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:25,159 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215147946] [2021-11-23 02:51:25,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:25,159 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:25,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:25,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:25,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:25,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215147946] [2021-11-23 02:51:25,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [215147946] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:25,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933133323] [2021-11-23 02:51:25,353 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:25,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:25,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:25,358 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:25,378 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:51:25,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:51:25,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:25,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:51:25,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:25,437 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 11 treesize of output 7 [2021-11-23 02:51:25,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,518 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 59 treesize of output 71 [2021-11-23 02:51:25,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,544 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 35 treesize of output 14 [2021-11-23 02:51:25,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:25,594 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 30 treesize of output 14 [2021-11-23 02:51:25,808 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-23 02:51:25,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-23 02:51:25,837 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:25,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:25,943 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 [2021-11-23 02:51:25,948 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 [2021-11-23 02:51:25,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:25,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933133323] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:25,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331631512] [2021-11-23 02:51:25,993 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:51:25,993 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:25,994 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:25,994 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:25,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:26,060 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:26,060 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 [2021-11-23 02:51:26,073 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 [2021-11-23 02:51:26,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:26,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 23 [2021-11-23 02:51:26,191 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:26,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,322 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:26,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:26,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 37 [2021-11-23 02:51:26,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,472 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 72 treesize of output 38 [2021-11-23 02:51:26,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,513 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 86 treesize of output 43 [2021-11-23 02:51:26,600 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 [2021-11-23 02:51:26,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:26,607 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 [2021-11-23 02:51:26,625 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:26,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= ~SIZE~0 100000) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:26,871 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:26,871 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:26,871 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 15 [2021-11-23 02:51:26,871 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585832068] [2021-11-23 02:51:26,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:26,872 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:51:26,872 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:26,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:51:26,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:51:26,873 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 15 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) [2021-11-23 02:51:27,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:27,012 INFO L93 Difference]: Finished difference Result 16 states and 17 transitions. [2021-11-23 02:51:27,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:51:27,013 INFO L78 Accepts]: Start accepts. Automaton has has 15 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) Word has length 8 [2021-11-23 02:51:27,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:27,014 INFO L225 Difference]: With dead ends: 16 [2021-11-23 02:51:27,014 INFO L226 Difference]: Without dead ends: 14 [2021-11-23 02:51:27,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:51:27,016 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 5 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:27,016 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 30 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 57 Invalid, 0 Unknown, 15 Unchecked, 0.1s Time] [2021-11-23 02:51:27,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-23 02:51:27,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 12. [2021-11-23 02:51:27,031 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) [2021-11-23 02:51:27,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-23 02:51:27,032 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-11-23 02:51:27,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:27,032 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-23 02:51:27,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 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) [2021-11-23 02:51:27,033 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-23 02:51:27,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:51:27,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:27,034 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:27,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:27,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:27,246 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:27,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:27,246 INFO L85 PathProgramCache]: Analyzing trace with hash -1678999286, now seen corresponding path program 1 times [2021-11-23 02:51:27,247 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:27,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726943080] [2021-11-23 02:51:27,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:27,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:27,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:27,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:27,357 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:27,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726943080] [2021-11-23 02:51:27,357 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1726943080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:27,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383433691] [2021-11-23 02:51:27,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:27,358 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:27,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:27,362 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:27,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:51:27,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:27,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 02:51:27,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:27,447 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 13 treesize of output 9 [2021-11-23 02:51:27,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:51:27,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:27,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:27,631 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 [2021-11-23 02:51:27,635 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 [2021-11-23 02:51:27,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:27,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383433691] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:27,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384321150] [2021-11-23 02:51:27,657 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:27,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:27,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:27,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:27,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:27,725 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:27,726 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 [2021-11-23 02:51:27,737 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 [2021-11-23 02:51:27,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:27,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,855 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:27,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:27,929 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:27,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:28,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:28,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,341 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:51:28,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 744 treesize of output 719 [2021-11-23 02:51:28,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,929 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:28,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:28,939 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:28,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 757 treesize of output 676 [2021-11-23 02:51:29,393 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 [2021-11-23 02:51:29,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:29,399 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 41 treesize of output 40 [2021-11-23 02:51:29,555 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:29,853 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '314#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:29,853 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:29,853 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:29,854 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-23 02:51:29,854 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764485809] [2021-11-23 02:51:29,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:29,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:51:29,855 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:29,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:51:29,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:51:29,856 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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) [2021-11-23 02:51:30,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:30,037 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-11-23 02:51:30,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:51:30,038 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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) Word has length 11 [2021-11-23 02:51:30,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:30,039 INFO L225 Difference]: With dead ends: 33 [2021-11-23 02:51:30,039 INFO L226 Difference]: Without dead ends: 31 [2021-11-23 02:51:30,039 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:51:30,040 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 30 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:30,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 37 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:30,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-23 02:51:30,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 16. [2021-11-23 02:51:30,045 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) [2021-11-23 02:51:30,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-23 02:51:30,046 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-11-23 02:51:30,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:30,046 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-23 02:51:30,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 13 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) [2021-11-23 02:51:30,046 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-23 02:51:30,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:51:30,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:30,047 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:30,082 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:30,264 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-23 02:51:30,265 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:30,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:30,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1607774434, now seen corresponding path program 2 times [2021-11-23 02:51:30,265 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:30,265 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304876065] [2021-11-23 02:51:30,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:30,265 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:30,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:30,388 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:30,388 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:30,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304876065] [2021-11-23 02:51:30,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304876065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:30,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678992258] [2021-11-23 02:51:30,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:30,389 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:30,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:30,394 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:30,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:51:30,448 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:51:30,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:30,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-23 02:51:30,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:30,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:30,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,570 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 61 treesize of output 75 [2021-11-23 02:51:30,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,596 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 36 treesize of output 16 [2021-11-23 02:51:30,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:30,636 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 39 treesize of output 16 [2021-11-23 02:51:30,927 INFO L354 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2021-11-23 02:51:30,927 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 45 treesize of output 31 [2021-11-23 02:51:30,951 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:30,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:31,057 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 [2021-11-23 02:51:31,060 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 191 treesize of output 183 [2021-11-23 02:51:31,148 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:31,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678992258] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:31,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1323361785] [2021-11-23 02:51:31,152 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:31,152 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:31,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:31,153 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:31,153 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:31,213 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:31,214 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 [2021-11-23 02:51:31,226 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 [2021-11-23 02:51:31,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:31,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 20 [2021-11-23 02:51:31,334 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:31,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,443 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:31,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:31,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 37 [2021-11-23 02:51:31,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,538 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 72 treesize of output 38 [2021-11-23 02:51:31,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,574 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 86 treesize of output 43 [2021-11-23 02:51:31,658 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 [2021-11-23 02:51:31,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:31,666 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 41 treesize of output 40 [2021-11-23 02:51:31,780 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:32,061 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '484#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:32,061 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:32,061 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:32,062 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2021-11-23 02:51:32,062 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603076579] [2021-11-23 02:51:32,062 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:32,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:51:32,063 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:32,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:51:32,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:51:32,064 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:32,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:32,413 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-23 02:51:32,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-23 02:51:32,413 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 02:51:32,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:32,414 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:51:32,414 INFO L226 Difference]: Without dead ends: 32 [2021-11-23 02:51:32,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 15 SyntacticMatches, 7 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=217, Invalid=1043, Unknown=0, NotChecked=0, Total=1260 [2021-11-23 02:51:32,416 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 32 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:32,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 41 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 92 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2021-11-23 02:51:32,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-23 02:51:32,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 15. [2021-11-23 02:51:32,420 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) [2021-11-23 02:51:32,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-23 02:51:32,421 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2021-11-23 02:51:32,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:32,421 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-23 02:51:32,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 18 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:32,422 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-23 02:51:32,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:51:32,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:32,422 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:51:32,453 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:32,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:32,640 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:32,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:32,640 INFO L85 PathProgramCache]: Analyzing trace with hash 126617484, now seen corresponding path program 3 times [2021-11-23 02:51:32,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:32,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557056711] [2021-11-23 02:51:32,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:32,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:32,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:32,698 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:32,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:32,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557056711] [2021-11-23 02:51:32,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557056711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:32,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390514192] [2021-11-23 02:51:32,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:51:32,699 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:32,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:32,700 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:32,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:51:32,749 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:51:32,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:32,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:51:32,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:32,825 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:32,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:32,860 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:32,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390514192] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:32,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088973070] [2021-11-23 02:51:32,863 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:32,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:32,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:32,863 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:32,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:32,914 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:32,914 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 [2021-11-23 02:51:32,961 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:32,962 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 [2021-11-23 02:51:32,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:32,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:33,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,078 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:33,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,151 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:33,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:33,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,353 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:33,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,358 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:51:33,358 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 4 case distinctions, treesize of input 257 treesize of output 234 [2021-11-23 02:51:33,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,516 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:33,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,531 INFO L354 Elim1Store]: treesize reduction 51, result has 5.6 percent of original size [2021-11-23 02:51:33,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 281 treesize of output 253 [2021-11-23 02:51:33,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:33,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,687 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:33,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:33,693 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:51:33,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 270 treesize of output 243 [2021-11-23 02:51:34,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,009 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:34,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,019 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:34,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 294 treesize of output 249 [2021-11-23 02:51:34,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:34,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,144 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:51:34,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 270 treesize of output 229 [2021-11-23 02:51:34,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:34,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,260 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:51:34,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 277 treesize of output 236 [2021-11-23 02:51:34,482 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 17 treesize of output 13 [2021-11-23 02:51:34,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:34,488 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 41 treesize of output 40 [2021-11-23 02:51:34,609 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:34,884 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '672#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:34,884 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:34,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:34,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-23 02:51:34,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137047850] [2021-11-23 02:51:34,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:34,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 02:51:34,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:34,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 02:51:34,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-11-23 02:51:34,886 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) [2021-11-23 02:51:34,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:34,947 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-11-23 02:51:34,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 02:51:34,948 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 [2021-11-23 02:51:34,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:34,949 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:51:34,949 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 02:51:34,949 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:51:34,950 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:34,951 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 29 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:51:34,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 02:51:34,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2021-11-23 02:51:34,955 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) [2021-11-23 02:51:34,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-23 02:51:34,955 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-11-23 02:51:34,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:34,955 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-23 02:51:34,955 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) [2021-11-23 02:51:34,956 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-23 02:51:34,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:51:34,956 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:34,956 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:51:34,976 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 02:51:35,156 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:35,157 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:35,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:35,157 INFO L85 PathProgramCache]: Analyzing trace with hash 272339192, now seen corresponding path program 4 times [2021-11-23 02:51:35,157 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:35,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138539179] [2021-11-23 02:51:35,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:35,158 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:35,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:35,272 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:35,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:35,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138539179] [2021-11-23 02:51:35,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138539179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:35,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986155933] [2021-11-23 02:51:35,273 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:51:35,273 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:35,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:35,278 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:35,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:51:35,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:35,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:51:35,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:35,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:35,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:51:35,464 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:35,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:35,516 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 [2021-11-23 02:51:35,517 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 [2021-11-23 02:51:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:35,541 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986155933] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:35,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [440890595] [2021-11-23 02:51:35,543 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:35,543 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:35,543 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:35,543 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:35,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:35,612 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:35,613 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 [2021-11-23 02:51:35,623 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 [2021-11-23 02:51:35,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:35,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 16 [2021-11-23 02:51:35,713 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:35,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,822 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:35,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:35,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:35,888 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-23 02:51:35,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 283 treesize of output 240 [2021-11-23 02:51:36,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,058 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-23 02:51:36,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 296 treesize of output 254 [2021-11-23 02:51:36,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 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 [2021-11-23 02:51:36,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:36,161 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 41 treesize of output 40 [2021-11-23 02:51:36,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:36,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '851#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:36,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:36,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:36,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-23 02:51:36,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794788856] [2021-11-23 02:51:36,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:36,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:51:36,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:36,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:51:36,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=356, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:51:36,632 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 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) [2021-11-23 02:51:36,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:36,846 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-11-23 02:51:36,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:51:36,847 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 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) Word has length 15 [2021-11-23 02:51:36,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:36,847 INFO L225 Difference]: With dead ends: 40 [2021-11-23 02:51:36,847 INFO L226 Difference]: Without dead ends: 38 [2021-11-23 02:51:36,848 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=738, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:51:36,849 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 33 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:36,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 51 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:36,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-23 02:51:36,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 20. [2021-11-23 02:51:36,856 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) [2021-11-23 02:51:36,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-23 02:51:36,857 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-11-23 02:51:36,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:36,857 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-23 02:51:36,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 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) [2021-11-23 02:51:36,858 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-23 02:51:36,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:51:36,858 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:36,858 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:51:36,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:37,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:37,070 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:37,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:37,070 INFO L85 PathProgramCache]: Analyzing trace with hash 494744844, now seen corresponding path program 5 times [2021-11-23 02:51:37,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:37,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232280936] [2021-11-23 02:51:37,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:37,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:37,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:37,263 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:37,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:37,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232280936] [2021-11-23 02:51:37,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232280936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:37,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78741455] [2021-11-23 02:51:37,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:37,265 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:37,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:37,266 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:37,292 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:51:37,322 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:51:37,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:37,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:51:37,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:37,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:37,444 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-23 02:51:37,445 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 [2021-11-23 02:51:37,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:37,464 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 [2021-11-23 02:51:37,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:37,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:37,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:37,485 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 [2021-11-23 02:51:37,799 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-23 02:51:37,800 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 31 [2021-11-23 02:51:37,822 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:37,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:37,937 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 [2021-11-23 02:51:37,940 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 [2021-11-23 02:51:37,970 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:37,970 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78741455] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:37,971 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1436219898] [2021-11-23 02:51:37,972 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:37,972 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:37,972 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:37,972 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:37,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:38,016 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:38,017 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 [2021-11-23 02:51:38,061 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:38,061 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 [2021-11-23 02:51:38,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:38,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:38,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,212 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:38,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:38,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,423 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:38,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,453 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:51:38,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 515 treesize of output 502 [2021-11-23 02:51:38,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,924 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:38,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:38,930 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:38,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 528 treesize of output 463 [2021-11-23 02:51:39,370 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 [2021-11-23 02:51:39,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:39,376 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 41 treesize of output 40 [2021-11-23 02:51:39,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:39,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1066#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:39,821 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:39,822 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:39,822 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 19 [2021-11-23 02:51:39,822 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469108086] [2021-11-23 02:51:39,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:39,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:51:39,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:39,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:51:39,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:51:39,824 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:40,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:40,203 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-23 02:51:40,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:51:40,204 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 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 [2021-11-23 02:51:40,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:40,205 INFO L225 Difference]: With dead ends: 41 [2021-11-23 02:51:40,205 INFO L226 Difference]: Without dead ends: 39 [2021-11-23 02:51:40,206 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 27 SyntacticMatches, 8 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=238, Invalid=1244, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 02:51:40,206 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 29 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 49 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:40,207 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 68 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 134 Invalid, 0 Unknown, 49 Unchecked, 0.1s Time] [2021-11-23 02:51:40,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-23 02:51:40,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 19. [2021-11-23 02:51:40,212 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) [2021-11-23 02:51:40,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-23 02:51:40,212 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 16 [2021-11-23 02:51:40,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:40,213 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-23 02:51:40,213 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:40,213 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-23 02:51:40,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:51:40,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:40,214 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:51:40,237 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 02:51:40,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-23 02:51:40,418 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:40,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:40,418 INFO L85 PathProgramCache]: Analyzing trace with hash 68864222, now seen corresponding path program 6 times [2021-11-23 02:51:40,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:40,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490474838] [2021-11-23 02:51:40,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:40,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:40,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:40,503 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:40,503 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:40,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490474838] [2021-11-23 02:51:40,504 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490474838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:40,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928219424] [2021-11-23 02:51:40,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:51:40,504 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:40,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:40,505 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:40,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:51:40,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:51:40,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:40,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:51:40,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:40,631 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:40,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:40,678 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:40,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928219424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:40,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1545282596] [2021-11-23 02:51:40,679 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:40,680 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:40,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:40,680 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:40,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:40,729 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:40,730 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 [2021-11-23 02:51:40,772 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:40,772 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 [2021-11-23 02:51:40,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:40,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,904 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:40,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:40,976 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:40,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:41,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,209 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:41,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,231 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:51:41,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 535 treesize of output 520 [2021-11-23 02:51:41,480 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:41,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,488 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:41,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 548 treesize of output 475 [2021-11-23 02:51:41,752 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 [2021-11-23 02:51:41,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:41,757 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 [2021-11-23 02:51:41,894 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:42,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1301#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:42,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:42,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:42,121 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2021-11-23 02:51:42,121 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587986662] [2021-11-23 02:51:42,121 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:42,122 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:51:42,122 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:42,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:51:42,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-11-23 02:51:42,123 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) [2021-11-23 02:51:42,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:42,237 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2021-11-23 02:51:42,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:51:42,238 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 [2021-11-23 02:51:42,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:42,239 INFO L225 Difference]: With dead ends: 41 [2021-11-23 02:51:42,239 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 02:51:42,240 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:51:42,243 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 24 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:42,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 37 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:42,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 02:51:42,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 20. [2021-11-23 02:51:42,254 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) [2021-11-23 02:51:42,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-23 02:51:42,255 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-11-23 02:51:42,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:42,255 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-23 02:51:42,256 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) [2021-11-23 02:51:42,256 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-23 02:51:42,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:51:42,257 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:42,257 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:51:42,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:42,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 02:51:42,478 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:42,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:42,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1378894774, now seen corresponding path program 7 times [2021-11-23 02:51:42,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:42,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742926545] [2021-11-23 02:51:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:42,479 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:42,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:42,709 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:42,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:42,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742926545] [2021-11-23 02:51:42,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742926545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:42,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914171546] [2021-11-23 02:51:42,710 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:51:42,710 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:42,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:42,712 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:42,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:51:42,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:42,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-23 02:51:42,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:42,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:42,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:51:42,949 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:42,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:43,071 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 [2021-11-23 02:51:43,073 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 [2021-11-23 02:51:43,097 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:43,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914171546] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:43,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1088640536] [2021-11-23 02:51:43,099 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:43,099 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:43,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:43,099 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:43,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:43,149 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:43,149 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 [2021-11-23 02:51:43,157 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 [2021-11-23 02:51:43,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:43,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:43,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,311 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:43,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:43,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,522 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:43,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,530 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:43,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 746 treesize of output 717 [2021-11-23 02:51:43,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:43,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:43,907 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:51:43,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 733 treesize of output 664 [2021-11-23 02:51:44,399 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 [2021-11-23 02:51:44,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:44,404 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 [2021-11-23 02:51:44,555 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:44,835 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1532#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:44,836 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:44,836 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:44,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 27 [2021-11-23 02:51:44,836 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769098853] [2021-11-23 02:51:44,836 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:44,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-23 02:51:44,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:44,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-23 02:51:44,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:51:44,838 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:45,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:45,305 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2021-11-23 02:51:45,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:51:45,305 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-23 02:51:45,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:45,306 INFO L225 Difference]: With dead ends: 47 [2021-11-23 02:51:45,306 INFO L226 Difference]: Without dead ends: 45 [2021-11-23 02:51:45,308 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=257, Invalid=1905, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:51:45,308 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 48 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 272 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:45,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 82 Invalid, 272 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:51:45,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-23 02:51:45,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 24. [2021-11-23 02:51:45,315 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) [2021-11-23 02:51:45,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-11-23 02:51:45,316 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2021-11-23 02:51:45,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:45,316 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-11-23 02:51:45,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.7777777777777777) internal successors, (48), 27 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:45,317 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-11-23 02:51:45,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 02:51:45,318 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:45,318 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:51:45,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:45,542 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:45,542 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:45,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:45,542 INFO L85 PathProgramCache]: Analyzing trace with hash 985216606, now seen corresponding path program 8 times [2021-11-23 02:51:45,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:45,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145580626] [2021-11-23 02:51:45,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:45,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:45,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:45,780 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:45,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:45,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145580626] [2021-11-23 02:51:45,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145580626] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:45,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729993422] [2021-11-23 02:51:45,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:45,780 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:45,781 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:45,781 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:45,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:51:45,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:51:45,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:45,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:51:45,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:45,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:45,984 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-23 02:51:45,984 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 [2021-11-23 02:51:46,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,008 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 13 [2021-11-23 02:51:46,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,054 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 48 treesize of output 19 [2021-11-23 02:51:46,485 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-23 02:51:46,486 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 31 [2021-11-23 02:51:46,515 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:46,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:46,711 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 [2021-11-23 02:51:46,716 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 191 treesize of output 183 [2021-11-23 02:51:46,771 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:46,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729993422] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:46,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715387966] [2021-11-23 02:51:46,773 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:46,773 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:46,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:46,774 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:46,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:46,817 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:46,817 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 [2021-11-23 02:51:46,841 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 [2021-11-23 02:51:46,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:46,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 16 [2021-11-23 02:51:46,928 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:46,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:46,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,016 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:47,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:47,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,090 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 72 treesize of output 38 [2021-11-23 02:51:47,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,127 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 72 treesize of output 38 [2021-11-23 02:51:47,178 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:47,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 42 [2021-11-23 02:51:47,255 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 [2021-11-23 02:51:47,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:47,260 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 [2021-11-23 02:51:47,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:47,788 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1810#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:47,788 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:47,788 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:47,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 30 [2021-11-23 02:51:47,788 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766519584] [2021-11-23 02:51:47,788 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:47,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-23 02:51:47,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:47,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-23 02:51:47,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1063, Unknown=0, NotChecked=0, Total=1190 [2021-11-23 02:51:47,790 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:48,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:48,604 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-23 02:51:48,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 02:51:48,604 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-23 02:51:48,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:48,605 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:51:48,605 INFO L226 Difference]: Without dead ends: 46 [2021-11-23 02:51:48,606 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 34 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=376, Invalid=2594, Unknown=0, NotChecked=0, Total=2970 [2021-11-23 02:51:48,607 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 40 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 137 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:48,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 132 Invalid, 453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 257 Invalid, 0 Unknown, 137 Unchecked, 0.3s Time] [2021-11-23 02:51:48,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-23 02:51:48,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 23. [2021-11-23 02:51:48,614 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) [2021-11-23 02:51:48,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-23 02:51:48,614 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-11-23 02:51:48,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:48,615 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-23 02:51:48,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 30 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:48,615 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-23 02:51:48,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:51:48,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:48,616 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:51:48,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:48,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:48,822 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:48,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:48,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1581775796, now seen corresponding path program 9 times [2021-11-23 02:51:48,822 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:48,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718260830] [2021-11-23 02:51:48,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:48,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:48,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:48,927 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:48,927 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:48,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718260830] [2021-11-23 02:51:48,927 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718260830] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:48,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912997887] [2021-11-23 02:51:48,928 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:51:48,928 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:48,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:48,929 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:48,950 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:51:48,977 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:51:48,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:48,978 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:51:48,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:49,089 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:49,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:49,133 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:49,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912997887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:49,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1400740537] [2021-11-23 02:51:49,135 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:49,135 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:49,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:49,135 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:49,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:49,196 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:49,197 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 [2021-11-23 02:51:49,244 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:49,245 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 [2021-11-23 02:51:49,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:49,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:49,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,400 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:49,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:49,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:49,511 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 3 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 27 [2021-11-23 02:51:49,533 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,578 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:49,579 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 59 treesize of output 32 [2021-11-23 02:51:49,601 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,693 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,699 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,720 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 34 [2021-11-23 02:51:49,769 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,779 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:49,830 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 [2021-11-23 02:51:49,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:49,833 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 [2021-11-23 02:51:49,955 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:50,237 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2098#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:50,237 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:50,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:50,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-23 02:51:50,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404480180] [2021-11-23 02:51:50,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:50,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:51:50,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:50,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:51:50,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:51:50,239 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) [2021-11-23 02:51:50,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:50,352 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-11-23 02:51:50,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:51:50,352 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 [2021-11-23 02:51:50,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:50,353 INFO L225 Difference]: With dead ends: 48 [2021-11-23 02:51:50,353 INFO L226 Difference]: Without dead ends: 30 [2021-11-23 02:51:50,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=158, Invalid=654, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:51:50,354 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 44 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:50,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 41 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:50,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-23 02:51:50,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2021-11-23 02:51:50,359 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) [2021-11-23 02:51:50,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-23 02:51:50,360 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-11-23 02:51:50,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:50,360 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-23 02:51:50,361 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) [2021-11-23 02:51:50,361 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-23 02:51:50,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:51:50,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:50,361 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:51:50,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:50,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-23 02:51:50,562 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:50,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:50,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1213374024, now seen corresponding path program 10 times [2021-11-23 02:51:50,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:50,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444996046] [2021-11-23 02:51:50,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:50,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:50,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:50,745 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:50,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:50,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444996046] [2021-11-23 02:51:50,746 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444996046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:50,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580555886] [2021-11-23 02:51:50,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:51:50,746 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:50,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:50,747 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:50,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:51:50,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:50,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-23 02:51:50,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:50,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:50,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:51:50,983 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:50,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:51,048 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 [2021-11-23 02:51:51,063 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 [2021-11-23 02:51:51,096 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:51,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580555886] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:51,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756960276] [2021-11-23 02:51:51,098 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:51,098 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:51,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:51,098 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:51,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:51,141 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:51,141 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 [2021-11-23 02:51:51,195 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:51,195 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 [2021-11-23 02:51:51,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:51:51,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:51,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,366 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:51:51,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:51:51,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:51,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,567 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:51:51,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 535 treesize of output 504 [2021-11-23 02:51:51,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:51:51,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:51,879 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:51:51,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 548 treesize of output 491 [2021-11-23 02:51:52,049 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 [2021-11-23 02:51:52,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:52,053 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 [2021-11-23 02:51:52,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:52,504 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2367#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:52,504 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:52,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:52,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-23 02:51:52,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955122915] [2021-11-23 02:51:52,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:52,505 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:51:52,505 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:52,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:51:52,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2021-11-23 02:51:52,506 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:52,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:52,841 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-11-23 02:51:52,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:51:52,841 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-11-23 02:51:52,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:52,842 INFO L225 Difference]: With dead ends: 54 [2021-11-23 02:51:52,842 INFO L226 Difference]: Without dead ends: 52 [2021-11-23 02:51:52,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=180, Invalid=1380, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:51:52,844 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 29 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:52,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 114 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:51:52,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-23 02:51:52,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 28. [2021-11-23 02:51:52,853 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) [2021-11-23 02:51:52,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-23 02:51:52,854 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-11-23 02:51:52,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:52,854 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-23 02:51:52,854 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 22 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:52,855 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-23 02:51:52,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 02:51:52,855 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:52,855 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:51:52,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:53,082 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:53,082 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:53,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:53,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1617146316, now seen corresponding path program 11 times [2021-11-23 02:51:53,082 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:53,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619504537] [2021-11-23 02:51:53,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:53,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:53,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:53,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:53,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619504537] [2021-11-23 02:51:53,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [619504537] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:53,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921932424] [2021-11-23 02:51:53,278 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:53,278 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:53,278 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:53,279 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:53,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:51:53,354 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-23 02:51:53,355 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:53,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:51:53,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:53,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:53,454 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-23 02:51:53,454 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 [2021-11-23 02:51:53,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:53,472 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 13 [2021-11-23 02:51:53,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:53,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:53,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:53,490 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 48 treesize of output 19 [2021-11-23 02:51:53,896 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-23 02:51:53,896 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 31 [2021-11-23 02:51:53,928 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:53,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:54,075 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 [2021-11-23 02:51:54,076 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 [2021-11-23 02:51:54,124 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:54,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921932424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:54,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [622204200] [2021-11-23 02:51:54,126 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:54,126 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:54,127 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:54,127 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:54,127 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:54,181 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:54,181 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 [2021-11-23 02:51:54,189 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 [2021-11-23 02:51:54,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:54,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 16 [2021-11-23 02:51:54,261 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:54,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,364 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:54,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:54,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 37 [2021-11-23 02:51:54,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,441 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-23 02:51:54,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 283 treesize of output 232 [2021-11-23 02:51:54,539 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 [2021-11-23 02:51:54,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:54,546 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 [2021-11-23 02:51:54,620 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:54,968 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2676#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:54,968 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:54,969 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:54,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 25 [2021-11-23 02:51:54,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575739851] [2021-11-23 02:51:54,969 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:54,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:51:54,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:54,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:51:54,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=767, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:51:54,970 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:55,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:55,528 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-11-23 02:51:55,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-23 02:51:55,528 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-23 02:51:55,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:55,529 INFO L225 Difference]: With dead ends: 46 [2021-11-23 02:51:55,529 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 02:51:55,530 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 44 SyntacticMatches, 13 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 518 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=258, Invalid=1904, Unknown=0, NotChecked=0, Total=2162 [2021-11-23 02:51:55,531 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 172 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:55,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 139 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 258 Invalid, 0 Unknown, 172 Unchecked, 0.2s Time] [2021-11-23 02:51:55,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 02:51:55,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 27. [2021-11-23 02:51:55,539 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) [2021-11-23 02:51:55,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-11-23 02:51:55,540 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2021-11-23 02:51:55,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:55,541 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-11-23 02:51:55,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.92) internal successors, (48), 25 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:55,541 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-11-23 02:51:55,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 02:51:55,542 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:55,542 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1] [2021-11-23 02:51:55,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:55,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:51:55,742 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:55,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:55,743 INFO L85 PathProgramCache]: Analyzing trace with hash -1175568354, now seen corresponding path program 12 times [2021-11-23 02:51:55,743 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:55,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655087928] [2021-11-23 02:51:55,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:55,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:55,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:55,849 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:55,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:55,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655087928] [2021-11-23 02:51:55,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655087928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:55,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086902367] [2021-11-23 02:51:55,850 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:51:55,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:55,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:55,852 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:55,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:51:55,903 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:51:55,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:51:55,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:51:55,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:56,076 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:56,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:56,138 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:56,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086902367] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:56,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [799992884] [2021-11-23 02:51:56,140 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:56,140 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:56,140 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:56,140 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:56,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:56,195 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:51:56,195 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 [2021-11-23 02:51:56,238 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:56,238 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 [2021-11-23 02:51:56,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:56,298 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:56,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 26 [2021-11-23 02:51:56,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,400 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:56,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:56,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,464 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-23 02:51:56,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 283 treesize of output 240 [2021-11-23 02:51:56,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,574 INFO L354 Elim1Store]: treesize reduction 34, result has 2.9 percent of original size [2021-11-23 02:51:56,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 296 treesize of output 254 [2021-11-23 02:51:56,674 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 [2021-11-23 02:51:56,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:56,679 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 [2021-11-23 02:51:56,786 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:57,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2991#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:57,141 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:57,141 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:57,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2021-11-23 02:51:57,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984923422] [2021-11-23 02:51:57,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:57,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:51:57,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:57,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:51:57,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=615, Unknown=0, NotChecked=0, Total=756 [2021-11-23 02:51:57,144 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) [2021-11-23 02:51:57,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:57,260 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2021-11-23 02:51:57,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:51:57,261 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 [2021-11-23 02:51:57,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:57,261 INFO L225 Difference]: With dead ends: 55 [2021-11-23 02:51:57,262 INFO L226 Difference]: Without dead ends: 34 [2021-11-23 02:51:57,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=206, Invalid=850, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:51:57,263 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 48 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:57,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 39 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:51:57,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-23 02:51:57,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2021-11-23 02:51:57,272 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) [2021-11-23 02:51:57,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-11-23 02:51:57,273 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 26 [2021-11-23 02:51:57,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:57,273 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-11-23 02:51:57,273 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) [2021-11-23 02:51:57,273 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-11-23 02:51:57,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 02:51:57,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:57,274 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-23 02:51:57,301 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:57,490 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 02:51:57,490 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:57,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:57,490 INFO L85 PathProgramCache]: Analyzing trace with hash -237041782, now seen corresponding path program 13 times [2021-11-23 02:51:57,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:57,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991189012] [2021-11-23 02:51:57,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:57,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:57,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:57,695 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:57,696 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:57,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991189012] [2021-11-23 02:51:57,696 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991189012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:57,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075747171] [2021-11-23 02:51:57,696 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:51:57,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:57,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:57,697 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:57,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:51:57,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:57,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-23 02:51:57,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:57,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:51:57,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:51:58,004 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:58,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:58,102 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 [2021-11-23 02:51:58,104 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 [2021-11-23 02:51:58,148 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:58,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075747171] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:58,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [924236927] [2021-11-23 02:51:58,150 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:51:58,151 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:58,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:58,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:58,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:51:58,210 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:51:58,211 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 [2021-11-23 02:51:58,220 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 [2021-11-23 02:51:58,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:51:58,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 12 [2021-11-23 02:51:58,307 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:58,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,383 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:51:58,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:51:58,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,441 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 65 treesize of output 35 [2021-11-23 02:51:58,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,471 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 79 treesize of output 40 [2021-11-23 02:51:58,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 78 treesize of output 40 [2021-11-23 02:51:58,547 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:51:58,610 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 [2021-11-23 02:51:58,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:51:58,617 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 [2021-11-23 02:51:58,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:51:59,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3305#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:51:59,090 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:51:59,090 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:51:59,090 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-23 02:51:59,090 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756534895] [2021-11-23 02:51:59,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:51:59,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:51:59,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:59,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:51:59,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=832, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:51:59,091 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 25 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:59,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:59,529 INFO L93 Difference]: Finished difference Result 61 states and 63 transitions. [2021-11-23 02:51:59,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-23 02:51:59,529 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 25 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-23 02:51:59,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:59,530 INFO L225 Difference]: With dead ends: 61 [2021-11-23 02:51:59,530 INFO L226 Difference]: Without dead ends: 59 [2021-11-23 02:51:59,531 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=208, Invalid=1862, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 02:51:59,531 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 31 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:59,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 146 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:51:59,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-11-23 02:51:59,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 32. [2021-11-23 02:51:59,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:59,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-11-23 02:51:59,540 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2021-11-23 02:51:59,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:59,540 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-11-23 02:51:59,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 25 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:59,541 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-11-23 02:51:59,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 02:51:59,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:59,541 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 5, 5, 1, 1, 1, 1, 1] [2021-11-23 02:51:59,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:59,742 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:51:59,742 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:59,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:59,742 INFO L85 PathProgramCache]: Analyzing trace with hash -1207489122, now seen corresponding path program 14 times [2021-11-23 02:51:59,742 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:59,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761304464] [2021-11-23 02:51:59,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:59,743 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:59,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:59,963 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:51:59,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:59,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761304464] [2021-11-23 02:51:59,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761304464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:59,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018061092] [2021-11-23 02:51:59,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:51:59,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:59,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:59,965 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:59,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:52:00,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-23 02:52:00,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:00,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 02:52:00,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:00,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:52:00,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:00,198 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 [2021-11-23 02:52:00,229 INFO L354 Elim1Store]: treesize reduction 84, result has 20.8 percent of original size [2021-11-23 02:52:00,229 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 [2021-11-23 02:52:00,647 INFO L354 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2021-11-23 02:52:00,647 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 31 [2021-11-23 02:52:00,690 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:00,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:00,844 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 29 treesize of output 27 [2021-11-23 02:52:00,846 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 87 treesize of output 83 [2021-11-23 02:52:00,895 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:00,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018061092] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:00,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017155747] [2021-11-23 02:52:00,897 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:52:00,897 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:00,897 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:00,898 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:00,898 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:00,964 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:52:00,964 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 [2021-11-23 02:52:00,975 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 [2021-11-23 02:52:00,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:52:01,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,095 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:01,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,167 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:52:01,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:52:01,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:01,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,348 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:52:01,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 744 treesize of output 703 [2021-11-23 02:52:01,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:01,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:01,734 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:52:01,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 757 treesize of output 692 [2021-11-23 02:52:02,040 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 17 treesize of output 13 [2021-11-23 02:52:02,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:02,045 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 41 treesize of output 40 [2021-11-23 02:52:02,127 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:02,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3662#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:52:02,495 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:02,495 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:02,495 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 28 [2021-11-23 02:52:02,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952917847] [2021-11-23 02:52:02,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:02,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:52:02,495 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:02,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:52:02,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1004, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 02:52:02,496 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:02,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:02,922 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2021-11-23 02:52:02,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:52:02,923 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 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 28 [2021-11-23 02:52:02,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:02,924 INFO L225 Difference]: With dead ends: 53 [2021-11-23 02:52:02,924 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:52:02,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=222, Invalid=2034, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:52:02,925 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 23 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 118 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:02,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 191 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 182 Invalid, 0 Unknown, 118 Unchecked, 0.1s Time] [2021-11-23 02:52:02,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:52:02,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 31. [2021-11-23 02:52:02,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 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) [2021-11-23 02:52:02,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-11-23 02:52:02,943 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2021-11-23 02:52:02,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:02,943 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-11-23 02:52:02,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 28 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:02,944 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-11-23 02:52:02,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 02:52:02,944 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:02,944 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1] [2021-11-23 02:52:02,978 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:03,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:52:03,170 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:03,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:03,170 INFO L85 PathProgramCache]: Analyzing trace with hash -780275444, now seen corresponding path program 15 times [2021-11-23 02:52:03,170 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:03,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158618524] [2021-11-23 02:52:03,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:03,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:03,310 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:03,311 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158618524] [2021-11-23 02:52:03,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158618524] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:03,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146451921] [2021-11-23 02:52:03,311 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:52:03,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:03,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:03,312 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:03,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:52:03,346 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:52:03,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:03,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:52:03,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:03,534 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:03,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:03,625 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:03,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146451921] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:03,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029846576] [2021-11-23 02:52:03,627 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:52:03,627 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:03,627 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:03,627 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:03,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:03,680 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:52:03,680 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 [2021-11-23 02:52:03,687 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 [2021-11-23 02:52:03,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 37 [2021-11-23 02:52:03,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:03,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:03,882 INFO L354 Elim1Store]: treesize reduction 236, result has 19.2 percent of original size [2021-11-23 02:52:03,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 283 treesize of output 328 [2021-11-23 02:52:04,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:04,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,054 INFO L354 Elim1Store]: treesize reduction 38, result has 2.6 percent of original size [2021-11-23 02:52:04,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 746 treesize of output 717 [2021-11-23 02:52:04,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,339 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:04,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,360 INFO L354 Elim1Store]: treesize reduction 33, result has 38.9 percent of original size [2021-11-23 02:52:04,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 733 treesize of output 664 [2021-11-23 02:52:04,842 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 17 treesize of output 13 [2021-11-23 02:52:04,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:04,847 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 41 treesize of output 40 [2021-11-23 02:52:04,931 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:05,249 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4019#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:52:05,249 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:05,249 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:05,249 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-23 02:52:05,249 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719266031] [2021-11-23 02:52:05,249 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:05,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:52:05,250 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:05,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:52:05,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=756, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:52:05,250 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:05,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:05,384 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-11-23 02:52:05,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:52:05,384 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2021-11-23 02:52:05,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:05,385 INFO L225 Difference]: With dead ends: 62 [2021-11-23 02:52:05,385 INFO L226 Difference]: Without dead ends: 38 [2021-11-23 02:52:05,386 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=261, Invalid=1071, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:52:05,387 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 56 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:05,387 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 43 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:52:05,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-23 02:52:05,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2021-11-23 02:52:05,398 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) [2021-11-23 02:52:05,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-11-23 02:52:05,399 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 30 [2021-11-23 02:52:05,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:05,399 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-11-23 02:52:05,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.24) internal successors, (56), 25 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:05,400 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-11-23 02:52:05,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-23 02:52:05,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:05,401 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-23 02:52:05,437 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:05,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:52:05,614 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:05,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:05,614 INFO L85 PathProgramCache]: Analyzing trace with hash -1952112008, now seen corresponding path program 16 times [2021-11-23 02:52:05,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:05,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647888169] [2021-11-23 02:52:05,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:05,615 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:05,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:05,920 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:05,921 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:05,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647888169] [2021-11-23 02:52:05,921 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647888169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:05,921 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902411540] [2021-11-23 02:52:05,921 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:52:05,921 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:05,922 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:05,926 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:05,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:52:05,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:05,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 02:52:05,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:06,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:52:06,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 25 [2021-11-23 02:52:06,342 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:06,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:06,424 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 [2021-11-23 02:52:06,426 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 [2021-11-23 02:52:06,466 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:06,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902411540] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:06,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70778517] [2021-11-23 02:52:06,468 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:52:06,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:06,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:06,469 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:06,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:06,509 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:52:06,510 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 [2021-11-23 02:52:06,546 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:52:06,546 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 [2021-11-23 02:52:06,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:52:06,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 20 [2021-11-23 02:52:06,625 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:52:06,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,700 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:52:06,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:52:06,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 37 [2021-11-23 02:52:06,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,764 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 86 treesize of output 43 [2021-11-23 02:52:06,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,793 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 72 treesize of output 38 [2021-11-23 02:52:06,845 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 17 treesize of output 13 [2021-11-23 02:52:06,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:06,849 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 36 treesize of output 35 [2021-11-23 02:52:06,925 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:07,437 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4378#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:52:07,437 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:07,437 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:07,437 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-23 02:52:07,438 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603558545] [2021-11-23 02:52:07,438 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:07,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 02:52:07,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:07,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 02:52:07,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=952, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:52:07,439 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:07,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:07,951 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2021-11-23 02:52:07,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:52:07,952 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-11-23 02:52:07,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:07,952 INFO L225 Difference]: With dead ends: 68 [2021-11-23 02:52:07,952 INFO L226 Difference]: Without dead ends: 66 [2021-11-23 02:52:07,954 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 65 SyntacticMatches, 13 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=228, Invalid=2222, Unknown=0, NotChecked=0, Total=2450 [2021-11-23 02:52:07,954 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:07,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 170 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:52:07,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-23 02:52:07,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 36. [2021-11-23 02:52:07,968 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) [2021-11-23 02:52:07,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-23 02:52:07,968 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2021-11-23 02:52:07,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:07,969 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-23 02:52:07,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 28 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:07,969 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-23 02:52:07,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-23 02:52:07,970 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:07,970 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-23 02:52:07,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:08,190 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:08,190 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:08,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:08,190 INFO L85 PathProgramCache]: Analyzing trace with hash 375660172, now seen corresponding path program 17 times [2021-11-23 02:52:08,190 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:08,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242941144] [2021-11-23 02:52:08,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:08,191 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:08,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:08,473 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:08,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:08,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242941144] [2021-11-23 02:52:08,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242941144] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:08,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [420037150] [2021-11-23 02:52:08,473 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:52:08,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:08,474 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:08,478 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:08,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:52:08,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-23 02:52:08,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:08,729 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:52:08,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:08,851 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 [2021-11-23 02:52:08,918 INFO L354 Elim1Store]: treesize reduction 31, result has 38.0 percent of original size [2021-11-23 02:52:08,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 36 [2021-11-23 02:52:09,003 INFO L354 Elim1Store]: treesize reduction 96, result has 19.3 percent of original size [2021-11-23 02:52:09,004 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 71 treesize of output 65 [2021-11-23 02:52:10,028 INFO L354 Elim1Store]: treesize reduction 24, result has 52.9 percent of original size [2021-11-23 02:52:10,029 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 69 treesize of output 70 [2021-11-23 02:52:10,125 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 51 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:10,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:52:12,111 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 39 treesize of output 37 [2021-11-23 02:52:12,113 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 109 treesize of output 103 [2021-11-23 02:52:12,149 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 45 proven. 47 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:12,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [420037150] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:52:12,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [962105667] [2021-11-23 02:52:12,150 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:52:12,150 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:52:12,151 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:52:12,151 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:52:12,151 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:52:12,195 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:52:12,196 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 [2021-11-23 02:52:12,202 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 [2021-11-23 02:52:12,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 92 [2021-11-23 02:52:12,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 23 [2021-11-23 02:52:12,260 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:52:12,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,334 INFO L354 Elim1Store]: treesize reduction 106, result has 12.4 percent of original size [2021-11-23 02:52:12,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 295 treesize of output 315 [2021-11-23 02:52:12,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,376 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 65 treesize of output 35 [2021-11-23 02:52:12,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,412 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 65 treesize of output 35 [2021-11-23 02:52:12,480 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:52:12,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 45 [2021-11-23 02:52:12,569 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 17 treesize of output 13 [2021-11-23 02:52:12,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:12,575 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 41 treesize of output 40 [2021-11-23 02:52:12,720 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:52:13,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4795#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 100000 ~MAX~0) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (<= ~MAX~0 100000) (= |#NULL.base| 0))' at error location [2021-11-23 02:52:13,173 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:52:13,173 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:52:13,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 45 [2021-11-23 02:52:13,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061080347] [2021-11-23 02:52:13,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:52:13,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-23 02:52:13,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:52:13,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-23 02:52:13,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=2177, Unknown=2, NotChecked=0, Total=2450 [2021-11-23 02:52:13,175 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 45 states, 45 states have (on average 1.8666666666666667) internal successors, (84), 45 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:15,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:52:15,493 INFO L93 Difference]: Finished difference Result 99 states and 104 transitions. [2021-11-23 02:52:15,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-23 02:52:15,493 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.8666666666666667) internal successors, (84), 45 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 32 [2021-11-23 02:52:15,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:52:15,494 INFO L225 Difference]: With dead ends: 99 [2021-11-23 02:52:15,494 INFO L226 Difference]: Without dead ends: 35 [2021-11-23 02:52:15,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=698, Invalid=5780, Unknown=2, NotChecked=0, Total=6480 [2021-11-23 02:52:15,497 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 10 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 75 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:52:15,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 175 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 64 Invalid, 0 Unknown, 75 Unchecked, 0.0s Time] [2021-11-23 02:52:15,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-23 02:52:15,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-23 02:52:15,511 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) [2021-11-23 02:52:15,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-11-23 02:52:15,512 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2021-11-23 02:52:15,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:52:15,512 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-11-23 02:52:15,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.8666666666666667) internal successors, (84), 45 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:52:15,513 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-11-23 02:52:15,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 02:52:15,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:52:15,514 INFO L514 BasicCegarLoop]: trace histogram [10, 7, 6, 6, 1, 1, 1, 1, 1] [2021-11-23 02:52:15,553 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:52:15,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:15,738 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:52:15,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:52:15,738 INFO L85 PathProgramCache]: Analyzing trace with hash -1166742516, now seen corresponding path program 18 times [2021-11-23 02:52:15,738 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:52:15,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [872006353] [2021-11-23 02:52:15,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:52:15,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:52:15,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:52:16,140 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:16,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:52:16,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [872006353] [2021-11-23 02:52:16,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [872006353] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:52:16,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863463461] [2021-11-23 02:52:16,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:52:16,141 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:52:16,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:52:16,146 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:52:16,162 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_38f13b3c-f282-43f4-9712-ed42ea83eb40/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:52:16,205 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:52:16,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:52:16,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-23 02:52:16,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:52:16,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2021-11-23 02:52:16,347 INFO L354 Elim1Store]: treesize reduction 139, result has 18.2 percent of original size [2021-11-23 02:52:16,347 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 [2021-11-23 02:52:16,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,363 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 13 [2021-11-23 02:52:16,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,398 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 48 treesize of output 19 [2021-11-23 02:52:16,715 INFO L354 Elim1Store]: treesize reduction 415, result has 18.9 percent of original size [2021-11-23 02:52:16,715 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 112 treesize of output 161 [2021-11-23 02:52:16,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,771 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 66 treesize of output 30 [2021-11-23 02:52:16,828 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:52:16,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:16,879 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 87 treesize of output 42 [2021-11-23 02:52:17,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,091 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,095 INFO L354 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2021-11-23 02:52:17,095 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 79 treesize of output 39 [2021-11-23 02:52:17,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,115 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 58 treesize of output 27 [2021-11-23 02:52:17,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:17,183 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 91 treesize of output 42 [2021-11-23 02:52:18,330 INFO L354 Elim1Store]: treesize reduction 779, result has 15.5 percent of original size [2021-11-23 02:52:18,330 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 162 treesize of output 223 [2021-11-23 02:52:18,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,424 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,440 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:52:18,441 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 119 treesize of output 80 [2021-11-23 02:52:18,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:18,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,566 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:52:18,566 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 119 treesize of output 80 [2021-11-23 02:52:18,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,839 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:52:18,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,855 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:52:18,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 14 disjoint index pairs (out of 21 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 121 treesize of output 75 [2021-11-23 02:52:18,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:18,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:52:19,005 INFO L354 Elim1Store]: treesize reduction 21, result has 40.0 percent of original size [2021-11-23 02:52:19,005 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 152 treesize of output 86 [2021-11-23 02:52:37,931 INFO L354 Elim1Store]: treesize reduction 212, result has 12.0 percent of original size [2021-11-23 02:52:37,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 194 treesize of output 128 [2021-11-23 02:52:38,069 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 3 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:52:38,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:53:01,834 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 69 treesize of output 67 [2021-11-23 02:53:01,851 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 3367979 treesize of output 3359787 [2021-11-23 02:53:10,937 WARN L227 SmtUtils]: Spent 9.08s on a formula simplification that was a NOOP. DAG size: 688 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:53:51,323 WARN L227 SmtUtils]: Spent 31.52s on a formula simplification. DAG size of input: 683 DAG size of output: 683 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:54:43,542 WARN L227 SmtUtils]: Spent 20.33s on a formula simplification. DAG size of input: 656 DAG size of output: 656 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:54:55,673 WARN L227 SmtUtils]: Spent 5.16s on a formula simplification. DAG size of input: 636 DAG size of output: 636 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)