./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_3-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_3-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur --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 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-26 00:36:09,966 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:36:09,969 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:36:10,020 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:36:10,022 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:36:10,027 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:36:10,030 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:36:10,033 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:36:10,036 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:36:10,043 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:36:10,045 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:36:10,048 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:36:10,048 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:36:10,052 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:36:10,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:36:10,057 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:36:10,059 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:36:10,060 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:36:10,063 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:36:10,071 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:36:10,073 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:36:10,076 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:36:10,078 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:36:10,079 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:36:10,091 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:36:10,092 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:36:10,092 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:36:10,095 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:36:10,096 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:36:10,099 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:36:10,099 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:36:10,100 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:36:10,103 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:36:10,104 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:36:10,105 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:36:10,106 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:36:10,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:36:10,108 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:36:10,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:36:10,109 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:36:10,110 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:36:10,111 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-26 00:36:10,162 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:36:10,163 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:36:10,164 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:36:10,164 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:36:10,165 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:36:10,166 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:36:10,166 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:36:10,167 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:36:10,167 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:36:10,167 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:36:10,169 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:36:10,169 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:36:10,170 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:36:10,170 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:36:10,170 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:36:10,171 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:36:10,171 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:36:10,172 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:36:10,173 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:36:10,174 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-26 00:36:10,174 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:36:10,174 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-26 00:36:10,175 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:36:10,175 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:36:10,176 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:36:10,176 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:36:10,176 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-26 00:36:10,177 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:36:10,177 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:36:10,177 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:36:10,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:36:10,179 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:36:10,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:36:10,180 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:36:10,180 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:36:10,181 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:36:10,181 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:36:10,181 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:36:10,182 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:36:10,182 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:36:10,182 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:36:10,183 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a [2022-11-26 00:36:10,506 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:36:10,543 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:36:10,546 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:36:10,547 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:36:10,548 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:36:10,550 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-26 00:36:14,094 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:36:14,341 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:36:14,341 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/sv-benchmarks/c/loop-acceleration/array_3-2.i [2022-11-26 00:36:14,350 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/data/6c3000e72/800075fd99194adab2c7dcf89f016d4a/FLAG7aa8e738d [2022-11-26 00:36:14,371 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/data/6c3000e72/800075fd99194adab2c7dcf89f016d4a [2022-11-26 00:36:14,375 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:36:14,382 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:36:14,385 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:36:14,386 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:36:14,392 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:36:14,395 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,397 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a94695c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14, skipping insertion in model container [2022-11-26 00:36:14,398 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,409 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:36:14,438 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:36:14,613 WARN L237 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_35bb142f-b018-432c-aa14-e180df898401/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-26 00:36:14,629 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:36:14,638 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:36:14,650 WARN L237 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_35bb142f-b018-432c-aa14-e180df898401/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2022-11-26 00:36:14,656 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:36:14,669 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:36:14,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14 WrapperNode [2022-11-26 00:36:14,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:36:14,671 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:36:14,672 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:36:14,672 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:36:14,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,689 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,711 INFO L138 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2022-11-26 00:36:14,711 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:36:14,712 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:36:14,712 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:36:14,713 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:36:14,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,726 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,727 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,732 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,736 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,738 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,741 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:36:14,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:36:14,743 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:36:14,743 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:36:14,744 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (1/1) ... [2022-11-26 00:36:14,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:36:14,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:14,785 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:36:14,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:36:14,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:36:14,836 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:36:14,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-26 00:36:14,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-26 00:36:14,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:36:14,837 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:36:14,837 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-26 00:36:14,838 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-26 00:36:14,931 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:36:14,933 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:36:15,076 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:36:15,123 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:36:15,123 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-26 00:36:15,127 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:36:15 BoogieIcfgContainer [2022-11-26 00:36:15,127 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:36:15,130 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:36:15,130 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:36:15,135 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:36:15,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:36:14" (1/3) ... [2022-11-26 00:36:15,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1464f374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:36:15, skipping insertion in model container [2022-11-26 00:36:15,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:36:14" (2/3) ... [2022-11-26 00:36:15,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1464f374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:36:15, skipping insertion in model container [2022-11-26 00:36:15,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:36:15" (3/3) ... [2022-11-26 00:36:15,139 INFO L112 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2022-11-26 00:36:15,173 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:36:15,173 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:36:15,243 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:36:15,256 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@55f9032d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:36:15,257 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:36:15,262 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) [2022-11-26 00:36:15,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-26 00:36:15,271 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:15,272 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-26 00:36:15,273 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:15,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:15,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1804998677, now seen corresponding path program 1 times [2022-11-26 00:36:15,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:15,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490915078] [2022-11-26 00:36:15,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:15,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:15,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:15,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:36:15,538 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:15,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490915078] [2022-11-26 00:36:15,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1490915078] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:36:15,540 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:36:15,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:36:15,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012015483] [2022-11-26 00:36:15,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:36:15,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-26 00:36:15,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:15,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-26 00:36:15,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:36:15,621 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 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2022-11-26 00:36:15,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:15,691 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2022-11-26 00:36:15,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-26 00:36:15,694 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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 [2022-11-26 00:36:15,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:15,703 INFO L225 Difference]: With dead ends: 16 [2022-11-26 00:36:15,704 INFO L226 Difference]: Without dead ends: 8 [2022-11-26 00:36:15,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:36:15,736 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:15,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:36:15,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2022-11-26 00:36:15,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2022-11-26 00:36:15,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:15,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2022-11-26 00:36:15,814 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2022-11-26 00:36:15,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:15,815 INFO L495 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2022-11-26 00:36:15,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 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) [2022-11-26 00:36:15,815 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2022-11-26 00:36:15,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2022-11-26 00:36:15,816 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:15,830 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:15,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 00:36:15,831 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:15,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:15,832 INFO L85 PathProgramCache]: Analyzing trace with hash -99384387, now seen corresponding path program 1 times [2022-11-26 00:36:15,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:15,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [609614641] [2022-11-26 00:36:15,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:15,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:15,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:15,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:36:15,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:15,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [609614641] [2022-11-26 00:36:15,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [609614641] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:36:15,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:36:15,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:36:15,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073196047] [2022-11-26 00:36:15,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:36:15,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-26 00:36:15,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:15,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-26 00:36:15,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:36:15,966 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:15,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:15,994 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2022-11-26 00:36:15,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-26 00:36:15,996 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 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 [2022-11-26 00:36:15,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:15,996 INFO L225 Difference]: With dead ends: 21 [2022-11-26 00:36:15,997 INFO L226 Difference]: Without dead ends: 15 [2022-11-26 00:36:15,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-26 00:36:15,999 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:16,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:36:16,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-26 00:36:16,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 9. [2022-11-26 00:36:16,005 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) [2022-11-26 00:36:16,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2022-11-26 00:36:16,006 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2022-11-26 00:36:16,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:16,007 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2022-11-26 00:36:16,007 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:16,008 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2022-11-26 00:36:16,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-26 00:36:16,008 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:16,009 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:16,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-26 00:36:16,009 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:16,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:16,011 INFO L85 PathProgramCache]: Analyzing trace with hash -1507211673, now seen corresponding path program 1 times [2022-11-26 00:36:16,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:16,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154760119] [2022-11-26 00:36:16,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:16,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:16,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:16,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:36:16,180 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:16,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154760119] [2022-11-26 00:36:16,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154760119] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:16,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [817170129] [2022-11-26 00:36:16,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:16,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:16,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:16,187 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:16,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:36:16,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:16,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:36:16,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:16,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:36:16,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:16,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:36:16,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [817170129] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:16,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274911213] [2022-11-26 00:36:16,451 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:16,451 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:16,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:16,463 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:16,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:16,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:16,590 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:16,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:16,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:16,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:16,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:16,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:36:16,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:16,869 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:36:16,908 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:36:16,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:36:17,071 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:17,133 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:17,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [274911213] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:36:17,352 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:17,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2022-11-26 00:36:17,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455506629] [2022-11-26 00:36:17,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:36:17,356 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 00:36:17,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:17,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 00:36:17,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-26 00:36:17,359 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:17,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:17,429 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2022-11-26 00:36:17,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-26 00:36:17,430 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 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 [2022-11-26 00:36:17,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:17,431 INFO L225 Difference]: With dead ends: 15 [2022-11-26 00:36:17,433 INFO L226 Difference]: Without dead ends: 11 [2022-11-26 00:36:17,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2022-11-26 00:36:17,442 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:17,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 5 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:36:17,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2022-11-26 00:36:17,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2022-11-26 00:36:17,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2022-11-26 00:36:17,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2022-11-26 00:36:17,460 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2022-11-26 00:36:17,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:17,462 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2022-11-26 00:36:17,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:17,464 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2022-11-26 00:36:17,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-26 00:36:17,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:17,465 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:17,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-26 00:36:17,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:17,672 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:17,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:17,673 INFO L85 PathProgramCache]: Analyzing trace with hash -320276660, now seen corresponding path program 1 times [2022-11-26 00:36:17,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:17,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505957017] [2022-11-26 00:36:17,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:17,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:17,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:17,829 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 00:36:17,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:17,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505957017] [2022-11-26 00:36:17,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505957017] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:17,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927206486] [2022-11-26 00:36:17,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:17,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:17,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:17,832 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:17,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:36:17,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:17,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2022-11-26 00:36:17,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:17,917 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 00:36:17,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:17,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 00:36:17,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927206486] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:17,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875473252] [2022-11-26 00:36:17,952 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:17,952 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:17,953 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:17,953 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:17,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:17,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:18,004 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:18,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:18,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:18,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:18,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:18,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:36:18,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:18,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:18,208 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:36:18,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 196 treesize of output 184 [2022-11-26 00:36:18,298 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:18,482 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:18,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '235#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:18,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:18,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:18,627 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-11-26 00:36:18,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608939262] [2022-11-26 00:36:18,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:18,628 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-26 00:36:18,628 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:18,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-26 00:36:18,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-26 00:36:18,631 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:18,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:18,711 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-11-26 00:36:18,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:36:18,712 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 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 10 [2022-11-26 00:36:18,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:18,715 INFO L225 Difference]: With dead ends: 40 [2022-11-26 00:36:18,716 INFO L226 Difference]: Without dead ends: 32 [2022-11-26 00:36:18,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-11-26 00:36:18,723 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:18,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 15 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:36:18,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-26 00:36:18,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 14. [2022-11-26 00:36:18,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:18,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-11-26 00:36:18,734 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2022-11-26 00:36:18,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:18,735 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-11-26 00:36:18,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:18,735 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-11-26 00:36:18,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-26 00:36:18,736 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:18,737 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:18,745 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:18,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:18,945 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:18,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:18,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1870426530, now seen corresponding path program 2 times [2022-11-26 00:36:18,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:18,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608265012] [2022-11-26 00:36:18,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:18,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:18,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:19,221 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 00:36:19,221 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:19,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608265012] [2022-11-26 00:36:19,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608265012] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:19,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750357166] [2022-11-26 00:36:19,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:36:19,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:19,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:19,224 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:19,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:36:19,305 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-26 00:36:19,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:19,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-26 00:36:19,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:19,346 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 00:36:19,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:19,378 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-26 00:36:19,379 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750357166] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:19,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1007119702] [2022-11-26 00:36:19,382 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:19,382 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:19,382 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:19,383 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:19,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:19,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:19,421 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:19,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:19,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:19,444 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:19,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:19,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:36:19,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:19,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:36:19,600 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:36:19,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:36:19,708 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:19,827 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:20,025 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:20,026 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:20,026 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:20,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2022-11-26 00:36:20,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417283316] [2022-11-26 00:36:20,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:20,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-26 00:36:20,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:20,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-26 00:36:20,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-11-26 00:36:20,031 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2022-11-26 00:36:20,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:20,142 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2022-11-26 00:36:20,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-26 00:36:20,143 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) Word has length 13 [2022-11-26 00:36:20,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:20,145 INFO L225 Difference]: With dead ends: 28 [2022-11-26 00:36:20,145 INFO L226 Difference]: Without dead ends: 20 [2022-11-26 00:36:20,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-11-26 00:36:20,147 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:20,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:36:20,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-26 00:36:20,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-11-26 00:36:20,157 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) [2022-11-26 00:36:20,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2022-11-26 00:36:20,159 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2022-11-26 00:36:20,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:20,159 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2022-11-26 00:36:20,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 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) [2022-11-26 00:36:20,160 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2022-11-26 00:36:20,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-26 00:36:20,161 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:20,161 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:20,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:20,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:20,367 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:20,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:20,367 INFO L85 PathProgramCache]: Analyzing trace with hash -11023279, now seen corresponding path program 3 times [2022-11-26 00:36:20,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:20,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159501277] [2022-11-26 00:36:20,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:20,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:20,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:20,541 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:20,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:20,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159501277] [2022-11-26 00:36:20,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159501277] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:20,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317846771] [2022-11-26 00:36:20,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:36:20,544 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:20,544 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:20,546 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:20,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:36:20,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:36:20,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:20,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-26 00:36:20,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:20,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:20,745 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:20,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317846771] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:20,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999992121] [2022-11-26 00:36:20,748 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:20,749 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:20,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:20,749 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:20,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:20,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:20,799 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:20,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:20,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:20,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:20,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:20,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:36:20,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:20,903 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:36:20,936 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:36:20,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:36:21,025 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:21,171 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:21,404 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '590#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:21,404 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:21,405 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:21,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-26 00:36:21,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910287523] [2022-11-26 00:36:21,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:21,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-26 00:36:21,406 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:21,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-26 00:36:21,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-26 00:36:21,407 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 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) [2022-11-26 00:36:21,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:21,516 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2022-11-26 00:36:21,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-26 00:36:21,517 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 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 19 [2022-11-26 00:36:21,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:21,518 INFO L225 Difference]: With dead ends: 76 [2022-11-26 00:36:21,518 INFO L226 Difference]: Without dead ends: 62 [2022-11-26 00:36:21,519 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-11-26 00:36:21,520 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:21,520 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 24 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:36:21,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-26 00:36:21,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 26. [2022-11-26 00:36:21,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:21,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2022-11-26 00:36:21,530 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2022-11-26 00:36:21,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:21,530 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2022-11-26 00:36:21,530 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 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) [2022-11-26 00:36:21,531 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2022-11-26 00:36:21,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-26 00:36:21,531 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:21,532 INFO L195 NwaCegarLoop]: trace histogram [10, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:21,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:21,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:21,738 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:21,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:21,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1846920175, now seen corresponding path program 4 times [2022-11-26 00:36:21,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:21,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496594537] [2022-11-26 00:36:21,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:21,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:21,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:22,085 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:22,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:22,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496594537] [2022-11-26 00:36:22,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496594537] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:22,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633554653] [2022-11-26 00:36:22,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:36:22,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:22,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:22,088 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:22,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:36:22,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:22,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-26 00:36:22,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:22,230 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:22,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:22,524 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:22,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633554653] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:22,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1336227646] [2022-11-26 00:36:22,527 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:22,527 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:22,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:22,527 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:22,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:22,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:22,561 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:36:22,561 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:36:22,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:22,593 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:22,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:22,617 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:22,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:36:22,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:22,674 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:36:22,707 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:36:22,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:36:22,845 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:23,000 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:23,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '907#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:23,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:23,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:23,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-26 00:36:23,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184628491] [2022-11-26 00:36:23,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:23,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-26 00:36:23,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:23,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-26 00:36:23,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-26 00:36:23,249 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 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) [2022-11-26 00:36:23,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:23,527 INFO L93 Difference]: Finished difference Result 160 states and 173 transitions. [2022-11-26 00:36:23,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-26 00:36:23,528 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 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) Word has length 25 [2022-11-26 00:36:23,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:23,529 INFO L225 Difference]: With dead ends: 160 [2022-11-26 00:36:23,530 INFO L226 Difference]: Without dead ends: 146 [2022-11-26 00:36:23,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-11-26 00:36:23,531 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 219 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:23,532 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 66 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:36:23,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-11-26 00:36:23,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 38. [2022-11-26 00:36:23,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:23,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2022-11-26 00:36:23,545 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 25 [2022-11-26 00:36:23,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:23,545 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2022-11-26 00:36:23,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 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) [2022-11-26 00:36:23,546 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2022-11-26 00:36:23,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-26 00:36:23,547 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:23,547 INFO L195 NwaCegarLoop]: trace histogram [22, 5, 4, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:23,565 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:23,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-26 00:36:23,765 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:23,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:23,766 INFO L85 PathProgramCache]: Analyzing trace with hash -385700975, now seen corresponding path program 5 times [2022-11-26 00:36:23,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:23,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45453115] [2022-11-26 00:36:23,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:23,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:23,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:36:24,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:24,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45453115] [2022-11-26 00:36:24,531 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45453115] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:24,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903412270] [2022-11-26 00:36:24,531 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:36:24,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:24,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:24,534 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:24,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:36:24,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-26 00:36:24,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:24,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-26 00:36:24,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-26 00:36:24,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2022-11-26 00:36:24,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [903412270] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:24,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [966137933] [2022-11-26 00:36:24,950 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:24,950 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:24,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:24,951 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:24,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:24,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:24,998 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:24,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:25,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:25,011 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:25,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:25,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:36:25,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:25,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:25,111 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:36:25,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 196 treesize of output 184 [2022-11-26 00:36:25,173 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:25,245 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:25,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1436#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:25,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:25,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:25,617 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 33 [2022-11-26 00:36:25,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911380039] [2022-11-26 00:36:25,617 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:25,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-26 00:36:25,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:25,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-26 00:36:25,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=781, Unknown=0, NotChecked=0, Total=1260 [2022-11-26 00:36:25,620 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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) [2022-11-26 00:36:26,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:26,562 INFO L93 Difference]: Finished difference Result 154 states and 185 transitions. [2022-11-26 00:36:26,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-26 00:36:26,563 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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 37 [2022-11-26 00:36:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:26,564 INFO L225 Difference]: With dead ends: 154 [2022-11-26 00:36:26,564 INFO L226 Difference]: Without dead ends: 92 [2022-11-26 00:36:26,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 94 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1151, Invalid=2389, Unknown=0, NotChecked=0, Total=3540 [2022-11-26 00:36:26,567 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 193 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:26,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 36 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:36:26,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-26 00:36:26,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2022-11-26 00:36:26,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:26,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2022-11-26 00:36:26,601 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 37 [2022-11-26 00:36:26,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:26,602 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2022-11-26 00:36:26,602 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 33 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) [2022-11-26 00:36:26,602 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2022-11-26 00:36:26,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-26 00:36:26,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:26,605 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:26,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:26,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:26,812 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:26,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:26,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1548067895, now seen corresponding path program 6 times [2022-11-26 00:36:26,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:26,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842022434] [2022-11-26 00:36:26,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:26,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:26,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:28,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:28,470 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:28,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842022434] [2022-11-26 00:36:28,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842022434] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:28,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649379621] [2022-11-26 00:36:28,471 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:36:28,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:28,471 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:28,482 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:28,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:36:28,691 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:36:28,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:36:28,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-26 00:36:28,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:28,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:28,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:30,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:30,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649379621] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:30,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [397908550] [2022-11-26 00:36:30,413 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:30,413 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:30,414 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:30,414 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:30,414 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:30,427 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:30,446 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:30,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:30,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:30,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:36:30,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:30,487 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:36:30,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:30,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:30,563 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:36:30,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 196 treesize of output 184 [2022-11-26 00:36:30,609 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:30,687 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:32,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2455#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:32,109 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:32,109 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:32,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-11-26 00:36:32,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754046452] [2022-11-26 00:36:32,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:32,110 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-26 00:36:32,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:32,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-26 00:36:32,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-26 00:36:32,115 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:32,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:32,938 INFO L93 Difference]: Finished difference Result 364 states and 395 transitions. [2022-11-26 00:36:32,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-26 00:36:32,939 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 91 [2022-11-26 00:36:32,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:32,941 INFO L225 Difference]: With dead ends: 364 [2022-11-26 00:36:32,941 INFO L226 Difference]: Without dead ends: 302 [2022-11-26 00:36:32,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 210 SyntacticMatches, 29 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2022-11-26 00:36:32,945 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 514 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:32,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [514 Valid, 111 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:36:32,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-11-26 00:36:32,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 122. [2022-11-26 00:36:32,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:32,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2022-11-26 00:36:32,984 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 91 [2022-11-26 00:36:32,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:32,985 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2022-11-26 00:36:32,985 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:32,985 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2022-11-26 00:36:32,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-26 00:36:32,988 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:32,988 INFO L195 NwaCegarLoop]: trace histogram [58, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:33,001 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:33,195 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:33,196 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:33,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:33,196 INFO L85 PathProgramCache]: Analyzing trace with hash -1453217143, now seen corresponding path program 7 times [2022-11-26 00:36:33,196 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:33,196 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313226473] [2022-11-26 00:36:33,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:33,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:33,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:37,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:37,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:36:37,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313226473] [2022-11-26 00:36:37,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313226473] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:36:37,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955953626] [2022-11-26 00:36:37,683 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:36:37,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:36:37,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:36:37,685 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:36:37,704 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:36:37,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:36:37,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-26 00:36:37,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:36:38,166 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:38,167 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:36:43,672 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:36:43,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955953626] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:36:43,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813479699] [2022-11-26 00:36:43,674 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:36:43,675 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:36:43,675 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:36:43,675 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:36:43,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:36:43,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:43,701 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:36:43,702 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:36:43,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:43,731 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:36:43,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:36:43,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:43,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:36:43,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:36:43,836 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:36:43,866 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:36:43,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:36:43,950 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:36:44,066 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:36:46,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4020#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:36:46,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:36:46,540 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:36:46,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 120 [2022-11-26 00:36:46,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610455596] [2022-11-26 00:36:46,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:36:46,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-11-26 00:36:46,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:36:46,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-11-26 00:36:46,549 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-26 00:36:46,549 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:50,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:36:50,999 INFO L93 Difference]: Finished difference Result 784 states and 845 transitions. [2022-11-26 00:36:51,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-11-26 00:36:51,000 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2022-11-26 00:36:51,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:36:51,003 INFO L225 Difference]: With dead ends: 784 [2022-11-26 00:36:51,003 INFO L226 Difference]: Without dead ends: 722 [2022-11-26 00:36:51,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 270 SyntacticMatches, 29 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5896 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2022-11-26 00:36:51,011 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 2261 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 582 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2261 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 1040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 582 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:36:51,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2261 Valid, 288 Invalid, 1040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [582 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-26 00:36:51,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2022-11-26 00:36:51,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 182. [2022-11-26 00:36:51,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:51,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2022-11-26 00:36:51,058 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 121 [2022-11-26 00:36:51,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:36:51,058 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2022-11-26 00:36:51,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:36:51,059 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2022-11-26 00:36:51,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2022-11-26 00:36:51,063 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:36:51,063 INFO L195 NwaCegarLoop]: trace histogram [118, 29, 28, 1, 1, 1, 1, 1, 1] [2022-11-26 00:36:51,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-26 00:36:51,268 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-26 00:36:51,269 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:36:51,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:36:51,269 INFO L85 PathProgramCache]: Analyzing trace with hash 346642441, now seen corresponding path program 8 times [2022-11-26 00:36:51,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:36:51,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1516583514] [2022-11-26 00:36:51,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:36:51,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:36:51,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:37:04,533 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2022-11-26 00:37:04,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:37:04,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1516583514] [2022-11-26 00:37:04,533 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1516583514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:37:04,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436154810] [2022-11-26 00:37:04,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:37:04,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:37:04,534 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:37:04,535 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:37:04,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:42:47,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-11-26 00:42:47,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:42:47,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-26 00:42:47,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:42:47,519 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-26 00:42:47,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:42:50,906 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2022-11-26 00:42:50,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436154810] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:42:50,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [221097965] [2022-11-26 00:42:50,909 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:42:50,909 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:42:50,909 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:42:50,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:42:50,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:42:50,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:42:50,945 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:42:50,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:42:50,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:42:50,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:42:50,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:42:50,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:42:51,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:42:51,021 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:42:51,051 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:42:51,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:42:51,131 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:42:51,240 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:42:55,537 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6637#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:42:55,538 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:42:55,538 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:42:55,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 32, 32] total 153 [2022-11-26 00:42:55,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483196532] [2022-11-26 00:42:55,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:42:55,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 153 states [2022-11-26 00:42:55,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:42:55,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 153 interpolants. [2022-11-26 00:42:55,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11339, Invalid=12841, Unknown=0, NotChecked=0, Total=24180 [2022-11-26 00:42:55,550 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:43:12,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:43:12,159 INFO L93 Difference]: Finished difference Result 754 states and 905 transitions. [2022-11-26 00:43:12,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 270 states. [2022-11-26 00:43:12,160 INFO L78 Accepts]: Start accepts. Automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 0 states have call successors, (0), 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 181 [2022-11-26 00:43:12,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:43:12,163 INFO L225 Difference]: With dead ends: 754 [2022-11-26 00:43:12,163 INFO L226 Difference]: Without dead ends: 452 [2022-11-26 00:43:12,180 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 478 SyntacticMatches, 29 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14015 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=26219, Invalid=49681, Unknown=0, NotChecked=0, Total=75900 [2022-11-26 00:43:12,181 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 1116 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 543 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1116 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 543 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:43:12,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1116 Valid, 143 Invalid, 1126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [543 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-26 00:43:12,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-11-26 00:43:12,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 452. [2022-11-26 00:43:12,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.0044345898004434) internal successors, (453), 451 states have internal predecessors, (453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:43:12,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 453 transitions. [2022-11-26 00:43:12,624 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 453 transitions. Word has length 181 [2022-11-26 00:43:12,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:43:12,625 INFO L495 AbstractCegarLoop]: Abstraction has 452 states and 453 transitions. [2022-11-26 00:43:12,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 153 states, 153 states have (on average 1.6339869281045751) internal successors, (250), 153 states have internal predecessors, (250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:43:12,625 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 453 transitions. [2022-11-26 00:43:12,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 452 [2022-11-26 00:43:12,642 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:43:12,642 INFO L195 NwaCegarLoop]: trace histogram [149, 148, 148, 1, 1, 1, 1, 1, 1] [2022-11-26 00:43:12,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:43:12,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-26 00:43:12,860 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:43:12,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:43:12,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1051002591, now seen corresponding path program 9 times [2022-11-26 00:43:12,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:43:12,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322784355] [2022-11-26 00:43:12,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:43:12,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:43:13,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:43:33,308 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:43:33,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:43:33,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322784355] [2022-11-26 00:43:33,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322784355] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:43:33,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770520370] [2022-11-26 00:43:33,309 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:43:33,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:43:33,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:43:33,311 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:43:33,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:43:34,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:43:34,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:43:34,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 2120 conjuncts, 150 conjunts are in the unsatisfiable core [2022-11-26 00:43:34,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:43:34,461 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:43:34,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:44:04,055 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:44:04,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770520370] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:44:04,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692422596] [2022-11-26 00:44:04,058 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:44:04,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:44:04,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:44:04,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:44:04,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:44:04,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:44:04,088 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-26 00:44:04,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2022-11-26 00:44:04,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:44:04,113 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:44:04,114 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:44:04,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:44:04,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-26 00:44:04,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:44:04,184 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-26 00:44:04,211 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-26 00:44:04,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 186 treesize of output 185 [2022-11-26 00:44:04,287 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:44:04,359 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:44:26,844 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11712#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:44:26,844 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:44:26,844 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:44:26,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [150, 150, 150] total 300 [2022-11-26 00:44:26,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841897983] [2022-11-26 00:44:26,845 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:44:26,847 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 301 states [2022-11-26 00:44:26,847 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:44:26,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 301 interpolants. [2022-11-26 00:44:26,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-26 00:44:26,862 INFO L87 Difference]: Start difference. First operand 452 states and 453 transitions. Second operand has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:45:33,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:45:33,656 INFO L93 Difference]: Finished difference Result 1804 states and 1955 transitions. [2022-11-26 00:45:33,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 300 states. [2022-11-26 00:45:33,658 INFO L78 Accepts]: Start accepts. Automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 0 states have call successors, (0), 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 451 [2022-11-26 00:45:33,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:45:33,663 INFO L225 Difference]: With dead ends: 1804 [2022-11-26 00:45:33,663 INFO L226 Difference]: Without dead ends: 1502 [2022-11-26 00:45:33,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1501 GetRequests, 1050 SyntacticMatches, 149 SemanticMatches, 302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68536 ImplicationChecksByTransitivity, 60.7s TimeCoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2022-11-26 00:45:33,672 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4664 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 1058 mSolverCounterSat, 1657 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4664 SdHoareTripleChecker+Valid, 468 SdHoareTripleChecker+Invalid, 2715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1657 IncrementalHoareTripleChecker+Valid, 1058 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:45:33,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4664 Valid, 468 Invalid, 2715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1657 Valid, 1058 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-26 00:45:33,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2022-11-26 00:45:34,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 602. [2022-11-26 00:45:34,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 601 states have (on average 1.0033277870216306) internal successors, (603), 601 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:45:34,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 603 transitions. [2022-11-26 00:45:34,133 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 603 transitions. Word has length 451 [2022-11-26 00:45:34,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:45:34,134 INFO L495 AbstractCegarLoop]: Abstraction has 602 states and 603 transitions. [2022-11-26 00:45:34,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-26 00:45:34,135 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 603 transitions. [2022-11-26 00:45:34,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 602 [2022-11-26 00:45:34,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:45:34,152 INFO L195 NwaCegarLoop]: trace histogram [298, 149, 148, 1, 1, 1, 1, 1, 1] [2022-11-26 00:45:34,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 00:45:34,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-26 00:45:34,362 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:45:34,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:45:34,363 INFO L85 PathProgramCache]: Analyzing trace with hash -281697567, now seen corresponding path program 10 times [2022-11-26 00:45:34,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:45:34,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473676478] [2022-11-26 00:45:34,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:45:34,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:45:35,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:46:48,159 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:46:48,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:46:48,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473676478] [2022-11-26 00:46:48,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473676478] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:46:48,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757454330] [2022-11-26 00:46:48,161 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:46:48,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:46:48,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:46:48,166 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:46:48,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_35bb142f-b018-432c-aa14-e180df898401/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 00:46:49,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:46:49,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 3470 conjuncts, 300 conjunts are in the unsatisfiable core [2022-11-26 00:46:49,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:46:50,059 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:46:50,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:48:46,156 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2022-11-26 00:48:46,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757454330] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:48:46,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [510725433] [2022-11-26 00:48:46,158 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2022-11-26 00:48:46,159 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:48:46,159 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:48:46,159 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:48:46,159 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:48:46,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:48:46,187 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-26 00:48:46,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2022-11-26 00:48:46,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:48:46,198 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-26 00:48:46,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:48:46,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:48:46,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:48:46,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:48:46,268 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-26 00:48:46,269 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 196 treesize of output 184 [2022-11-26 00:48:46,307 INFO L350 Elim1Store]: Elim1 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 16 treesize of output 12 [2022-11-26 00:48:46,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:49:25,971 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19517#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:49:25,971 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:49:25,972 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:49:25,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [300, 300, 300] total 600 [2022-11-26 00:49:25,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38902734] [2022-11-26 00:49:25,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:49:25,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 601 states [2022-11-26 00:49:25,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:49:26,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 601 interpolants. [2022-11-26 00:49:26,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180309, Invalid=183903, Unknown=0, NotChecked=0, Total=364212 [2022-11-26 00:49:26,023 INFO L87 Difference]: Start difference. First operand 602 states and 603 transitions. Second operand has 601 states, 601 states have (on average 1.0116472545757071) internal successors, (608), 600 states have internal predecessors, (608), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)