./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/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_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/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_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/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 ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e --- 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 [2022-11-25 23:46:04,138 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:46:04,141 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:46:04,163 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:46:04,163 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:46:04,164 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:46:04,166 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:46:04,168 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:46:04,170 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:46:04,171 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:46:04,172 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:46:04,173 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:46:04,174 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:46:04,175 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:46:04,176 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:46:04,177 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:46:04,178 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:46:04,179 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:46:04,181 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:46:04,183 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:46:04,184 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:46:04,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:46:04,187 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:46:04,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:46:04,192 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:46:04,192 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:46:04,193 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:46:04,194 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:46:04,194 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:46:04,195 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:46:04,195 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:46:04,196 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:46:04,197 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:46:04,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:46:04,199 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:46:04,199 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:46:04,200 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:46:04,200 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:46:04,201 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:46:04,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:46:04,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:46:04,203 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-25 23:46:04,228 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:46:04,228 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:46:04,228 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:46:04,229 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:46:04,229 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:46:04,230 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:46:04,230 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:46:04,230 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:46:04,230 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:46:04,231 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:46:04,231 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:46:04,231 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:46:04,232 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:46:04,232 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:46:04,232 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:46:04,233 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:46:04,233 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:46:04,233 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:46:04,234 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:46:04,234 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:46:04,235 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:46:04,235 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:46:04,235 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:46:04,235 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-25 23:46:04,236 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:46:04,236 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-25 23:46:04,236 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:46:04,236 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-25 23:46:04,237 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:46:04,237 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-25 23:46:04,237 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:46:04,237 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:46:04,238 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:46:04,238 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:46:04,238 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:46:04,239 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:46:04,240 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-25 23:46:04,240 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:46:04,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:46:04,240 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-25 23:46:04,241 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:46:04,241 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_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ca2dcd06e0389cf665904adfee9ccd6a1a268c87541d3b3b3e0bcffb3a75664e [2022-11-25 23:46:04,571 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:46:04,599 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:46:04,601 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:46:04,603 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:46:04,605 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:46:04,606 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/array-crafted/zero_sum4.c [2022-11-25 23:46:07,770 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:46:07,990 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:46:07,991 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/sv-benchmarks/c/array-crafted/zero_sum4.c [2022-11-25 23:46:07,998 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/data/5fd7e2fc8/b312f5e2a9f24fe0ae5d7088df6ab4b4/FLAGa865471f5 [2022-11-25 23:46:08,016 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/data/5fd7e2fc8/b312f5e2a9f24fe0ae5d7088df6ab4b4 [2022-11-25 23:46:08,019 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:46:08,020 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:46:08,022 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:46:08,022 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:46:08,027 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:46:08,028 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,029 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57eccb4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08, skipping insertion in model container [2022-11-25 23:46:08,029 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,038 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:46:08,055 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:46:08,263 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_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-11-25 23:46:08,286 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:46:08,296 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:46:08,309 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_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/sv-benchmarks/c/array-crafted/zero_sum4.c[400,413] [2022-11-25 23:46:08,321 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:46:08,335 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:46:08,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08 WrapperNode [2022-11-25 23:46:08,336 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:46:08,337 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:46:08,337 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:46:08,337 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:46:08,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,354 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,376 INFO L138 Inliner]: procedures = 15, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 127 [2022-11-25 23:46:08,377 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:46:08,377 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:46:08,377 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:46:08,377 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:46:08,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,391 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,391 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,397 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,402 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,404 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,405 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:46:08,422 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:46:08,422 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:46:08,423 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:46:08,423 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (1/1) ... [2022-11-25 23:46:08,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:46:08,443 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:08,468 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:46:08,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:46:08,517 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:46:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:46:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 23:46:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:46:08,518 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:46:08,519 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:46:08,519 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-25 23:46:08,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 23:46:08,669 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:46:08,671 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:46:09,027 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:46:09,151 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:46:09,151 INFO L300 CfgBuilder]: Removed 9 assume(true) statements. [2022-11-25 23:46:09,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:46:09 BoogieIcfgContainer [2022-11-25 23:46:09,154 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:46:09,157 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:46:09,157 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:46:09,161 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:46:09,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:46:08" (1/3) ... [2022-11-25 23:46:09,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51c53968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:46:09, skipping insertion in model container [2022-11-25 23:46:09,162 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:46:08" (2/3) ... [2022-11-25 23:46:09,162 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51c53968 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:46:09, skipping insertion in model container [2022-11-25 23:46:09,163 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:46:09" (3/3) ... [2022-11-25 23:46:09,164 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum4.c [2022-11-25 23:46:09,186 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:46:09,186 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-25 23:46:09,241 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:46:09,248 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;@27a23aca, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:46:09,249 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-25 23:46:09,253 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 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) [2022-11-25 23:46:09,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-25 23:46:09,259 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:09,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:09,261 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:09,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:09,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1453537585, now seen corresponding path program 1 times [2022-11-25 23:46:09,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:09,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761810706] [2022-11-25 23:46:09,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:09,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:09,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:09,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:09,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:09,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761810706] [2022-11-25 23:46:09,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761810706] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:46:09,600 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:46:09,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:46:09,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265450234] [2022-11-25 23:46:09,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:46:09,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:46:09,608 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:09,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:46:09,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:46:09,661 INFO L87 Difference]: Start difference. First operand has 17 states, 15 states have (on average 1.8) internal successors, (27), 16 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) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-11-25 23:46:09,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:09,796 INFO L93 Difference]: Finished difference Result 32 states and 51 transitions. [2022-11-25 23:46:09,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:46:09,799 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) Word has length 13 [2022-11-25 23:46:09,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:09,810 INFO L225 Difference]: With dead ends: 32 [2022-11-25 23:46:09,811 INFO L226 Difference]: Without dead ends: 15 [2022-11-25 23:46:09,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:46:09,822 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:09,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:46:09,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-11-25 23:46:09,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-11-25 23:46:09,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:09,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2022-11-25 23:46:09,869 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 13 [2022-11-25 23:46:09,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:09,870 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2022-11-25 23:46:09,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 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) [2022-11-25 23:46:09,871 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2022-11-25 23:46:09,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:46:09,872 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:09,873 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:09,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:46:09,874 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:09,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:09,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1839481755, now seen corresponding path program 1 times [2022-11-25 23:46:09,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:09,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218372424] [2022-11-25 23:46:09,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:09,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:09,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:09,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:46:09,994 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:09,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218372424] [2022-11-25 23:46:09,995 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218372424] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:46:09,995 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:46:09,995 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:46:09,995 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440566708] [2022-11-25 23:46:09,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:46:09,997 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:46:09,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:09,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:46:09,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:46:09,999 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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) [2022-11-25 23:46:10,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:10,098 INFO L93 Difference]: Finished difference Result 33 states and 55 transitions. [2022-11-25 23:46:10,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:46:10,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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 14 [2022-11-25 23:46:10,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:10,099 INFO L225 Difference]: With dead ends: 33 [2022-11-25 23:46:10,100 INFO L226 Difference]: Without dead ends: 23 [2022-11-25 23:46:10,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:46:10,102 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:10,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 5 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:46:10,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-25 23:46:10,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-11-25 23:46:10,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:10,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-11-25 23:46:10,111 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 14 [2022-11-25 23:46:10,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:10,111 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-11-25 23:46:10,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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) [2022-11-25 23:46:10,112 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-11-25 23:46:10,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-25 23:46:10,112 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:10,113 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:10,113 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:46:10,113 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:10,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:10,114 INFO L85 PathProgramCache]: Analyzing trace with hash 1144628674, now seen corresponding path program 1 times [2022-11-25 23:46:10,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:10,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775208291] [2022-11-25 23:46:10,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:10,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:10,267 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 23:46:10,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:10,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775208291] [2022-11-25 23:46:10,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775208291] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:10,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89533968] [2022-11-25 23:46:10,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:10,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:10,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:10,274 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:10,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:46:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:10,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:46:10,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:10,490 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 23:46:10,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:10,572 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-25 23:46:10,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89533968] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:10,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1370927612] [2022-11-25 23:46:10,605 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:10,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:10,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:10,616 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:10,617 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:10,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:10,763 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:10,764 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:10,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:10,838 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:10,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:10,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:10,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:11,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:11,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:11,119 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:46:11,120 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 244 treesize of output 232 [2022-11-25 23:46:11,243 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 [2022-11-25 23:46:11,681 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:11,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '336#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:11,973 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:11,973 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:11,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2022-11-25 23:46:11,973 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320075630] [2022-11-25 23:46:11,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:11,974 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:46:11,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:11,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:46:11,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:46:11,975 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2022-11-25 23:46:12,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:12,064 INFO L93 Difference]: Finished difference Result 43 states and 59 transitions. [2022-11-25 23:46:12,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:46:12,065 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) Word has length 22 [2022-11-25 23:46:12,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:12,066 INFO L225 Difference]: With dead ends: 43 [2022-11-25 23:46:12,066 INFO L226 Difference]: Without dead ends: 24 [2022-11-25 23:46:12,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-11-25 23:46:12,068 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:12,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:46:12,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-25 23:46:12,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-25 23:46:12,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 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) [2022-11-25 23:46:12,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-25 23:46:12,075 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 22 [2022-11-25 23:46:12,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:12,076 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-25 23:46:12,076 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 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) [2022-11-25 23:46:12,076 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-25 23:46:12,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 23:46:12,077 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:12,077 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:12,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:12,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:12,284 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:12,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:12,285 INFO L85 PathProgramCache]: Analyzing trace with hash 88512748, now seen corresponding path program 2 times [2022-11-25 23:46:12,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:12,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845254105] [2022-11-25 23:46:12,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:12,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:12,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:12,404 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:46:12,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:12,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845254105] [2022-11-25 23:46:12,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845254105] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:12,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443190264] [2022-11-25 23:46:12,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:12,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:12,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:12,407 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:12,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:46:12,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-25 23:46:12,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:12,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:46:12,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:12,593 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:46:12,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:12,643 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:46:12,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443190264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:12,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824668690] [2022-11-25 23:46:12,649 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:12,649 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:12,651 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:12,651 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:12,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:12,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:12,726 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:12,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:12,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:12,810 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:12,811 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:12,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:12,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:12,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:12,937 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:12,964 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:12,965 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 234 treesize of output 233 [2022-11-25 23:46:13,086 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 [2022-11-25 23:46:13,420 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:13,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '602#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:13,701 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:13,702 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:13,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2022-11-25 23:46:13,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744221452] [2022-11-25 23:46:13,702 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:13,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:46:13,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:13,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:46:13,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:46:13,704 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:13,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:13,794 INFO L93 Difference]: Finished difference Result 49 states and 71 transitions. [2022-11-25 23:46:13,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:46:13,795 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-25 23:46:13,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:13,796 INFO L225 Difference]: With dead ends: 49 [2022-11-25 23:46:13,796 INFO L226 Difference]: Without dead ends: 32 [2022-11-25 23:46:13,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 7 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:46:13,798 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:13,798 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 5 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:46:13,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-25 23:46:13,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-25 23:46:13,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:13,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-11-25 23:46:13,812 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2022-11-25 23:46:13,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:13,812 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-11-25 23:46:13,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.0) internal successors, (40), 8 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:13,813 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-11-25 23:46:13,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-25 23:46:13,816 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:13,816 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:13,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:14,022 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:14,022 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:14,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:14,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1125282897, now seen corresponding path program 3 times [2022-11-25 23:46:14,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:14,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326858958] [2022-11-25 23:46:14,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:14,024 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:14,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:17,416 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:17,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:17,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326858958] [2022-11-25 23:46:17,418 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326858958] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:17,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996817939] [2022-11-25 23:46:17,418 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:46:17,418 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:17,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:17,420 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:17,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:46:17,521 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:46:17,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:17,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-25 23:46:17,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:17,564 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 15 treesize of output 11 [2022-11-25 23:46:18,205 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:18,207 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:46:18,208 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 9 [2022-11-25 23:46:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:18,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:18,582 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:46:18,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996817939] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:18,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1109541098] [2022-11-25 23:46:18,586 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:18,586 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:18,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:18,586 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:18,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:18,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:18,636 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:18,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:18,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:18,687 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:18,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:18,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:18,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:18,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:18,794 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:18,819 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:18,820 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 234 treesize of output 233 [2022-11-25 23:46:18,919 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 [2022-11-25 23:46:19,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:19,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '954#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:19,692 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:19,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:19,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 9] total 18 [2022-11-25 23:46:19,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626180300] [2022-11-25 23:46:19,693 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:19,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-25 23:46:19,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:19,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-25 23:46:19,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:46:19,695 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:20,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:20,109 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2022-11-25 23:46:20,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:46:20,109 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-11-25 23:46:20,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:20,110 INFO L225 Difference]: With dead ends: 57 [2022-11-25 23:46:20,110 INFO L226 Difference]: Without dead ends: 54 [2022-11-25 23:46:20,111 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 60 SyntacticMatches, 40 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:46:20,112 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:20,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 21 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:46:20,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-11-25 23:46:20,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2022-11-25 23:46:20,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 51 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:20,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-11-25 23:46:20,125 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 31 [2022-11-25 23:46:20,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:20,126 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-11-25 23:46:20,126 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 18 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:20,126 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-11-25 23:46:20,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-25 23:46:20,127 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:20,127 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:20,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-25 23:46:20,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:20,334 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:20,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:20,334 INFO L85 PathProgramCache]: Analyzing trace with hash -76458201, now seen corresponding path program 4 times [2022-11-25 23:46:20,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:20,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427273437] [2022-11-25 23:46:20,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:20,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:20,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:20,498 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:46:20,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:20,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427273437] [2022-11-25 23:46:20,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427273437] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:20,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5586814] [2022-11-25 23:46:20,500 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:46:20,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:20,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:20,501 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:20,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:46:20,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:20,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:46:20,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:20,675 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:46:20,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:20,745 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-25 23:46:20,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5586814] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:20,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [511813571] [2022-11-25 23:46:20,750 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:20,750 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:20,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:20,752 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:20,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:20,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:20,809 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:20,809 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:20,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:20,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:46:20,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:20,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:20,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:20,913 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:20,941 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:20,942 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 234 treesize of output 233 [2022-11-25 23:46:21,041 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 [2022-11-25 23:46:21,273 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:21,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1366#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:21,590 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:21,591 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:21,591 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-25 23:46:21,591 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106549020] [2022-11-25 23:46:21,591 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:21,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:46:21,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:21,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:46:21,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:46:21,593 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:21,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:21,850 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2022-11-25 23:46:21,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:46:21,852 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-25 23:46:21,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:21,852 INFO L225 Difference]: With dead ends: 102 [2022-11-25 23:46:21,853 INFO L226 Difference]: Without dead ends: 53 [2022-11-25 23:46:21,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 9 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-11-25 23:46:21,854 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 43 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:21,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 9 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:46:21,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-25 23:46:21,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-25 23:46:21,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.3076923076923077) internal successors, (68), 52 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) [2022-11-25 23:46:21,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 68 transitions. [2022-11-25 23:46:21,871 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 68 transitions. Word has length 32 [2022-11-25 23:46:21,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:21,872 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 68 transitions. [2022-11-25 23:46:21,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:21,874 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 68 transitions. [2022-11-25 23:46:21,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-25 23:46:21,875 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:21,875 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:21,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:22,076 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:22,076 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:22,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:22,077 INFO L85 PathProgramCache]: Analyzing trace with hash 1622138321, now seen corresponding path program 5 times [2022-11-25 23:46:22,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:22,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120118305] [2022-11-25 23:46:22,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:22,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:22,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:22,202 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 23:46:22,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:22,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120118305] [2022-11-25 23:46:22,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120118305] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:22,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069193311] [2022-11-25 23:46:22,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:22,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:22,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:22,220 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:22,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:46:22,314 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:46:22,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:22,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:46:22,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:22,382 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 23:46:22,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:22,442 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-25 23:46:22,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069193311] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:22,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [904209961] [2022-11-25 23:46:22,446 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:22,446 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:22,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:22,446 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:22,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:22,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:22,495 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:22,496 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:22,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:22,541 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:22,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:22,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:22,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:22,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:22,679 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:22,709 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:22,709 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 234 treesize of output 233 [2022-11-25 23:46:22,819 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 [2022-11-25 23:46:23,043 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:23,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1880#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:23,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:23,428 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:23,428 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-11-25 23:46:23,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863901708] [2022-11-25 23:46:23,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:23,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:46:23,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:23,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:46:23,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:46:23,430 INFO L87 Difference]: Start difference. First operand 53 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:23,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:23,631 INFO L93 Difference]: Finished difference Result 82 states and 110 transitions. [2022-11-25 23:46:23,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:46:23,632 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-25 23:46:23,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:23,633 INFO L225 Difference]: With dead ends: 82 [2022-11-25 23:46:23,633 INFO L226 Difference]: Without dead ends: 41 [2022-11-25 23:46:23,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 76 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=114, Invalid=392, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:46:23,634 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 105 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:23,635 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 11 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:46:23,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-25 23:46:23,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-11-25 23:46:23,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.225) internal successors, (49), 40 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:23,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-11-25 23:46:23,642 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-11-25 23:46:23,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:23,642 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-11-25 23:46:23,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:23,643 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-11-25 23:46:23,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-25 23:46:23,644 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:23,644 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:23,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:23,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:23,845 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:23,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:23,845 INFO L85 PathProgramCache]: Analyzing trace with hash -231017630, now seen corresponding path program 6 times [2022-11-25 23:46:23,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:23,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534807194] [2022-11-25 23:46:23,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:23,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:24,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:28,769 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:28,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:28,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534807194] [2022-11-25 23:46:28,770 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534807194] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:28,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178420610] [2022-11-25 23:46:28,770 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:46:28,770 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:28,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:28,772 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:28,787 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:46:28,888 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:46:28,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:28,892 WARN L261 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 114 conjunts are in the unsatisfiable core [2022-11-25 23:46:28,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:28,933 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 15 treesize of output 11 [2022-11-25 23:46:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:30,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:31,053 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-25 23:46:31,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178420610] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:31,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2058810391] [2022-11-25 23:46:31,058 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:31,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:31,058 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:31,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:31,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:31,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:31,164 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:31,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:31,194 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:31,250 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:31,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:31,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:31,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:31,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:31,375 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:31,403 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:31,403 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 234 treesize of output 233 [2022-11-25 23:46:31,532 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 [2022-11-25 23:46:31,766 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:33,080 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2404#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:33,081 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:33,081 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:33,081 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 15, 11] total 44 [2022-11-25 23:46:33,081 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309503597] [2022-11-25 23:46:33,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:33,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 23:46:33,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:33,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 23:46:33,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2169, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:46:33,084 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:36,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:36,555 INFO L93 Difference]: Finished difference Result 112 states and 139 transitions. [2022-11-25 23:46:36,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:46:36,555 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-25 23:46:36,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:36,560 INFO L225 Difference]: With dead ends: 112 [2022-11-25 23:46:36,560 INFO L226 Difference]: Without dead ends: 109 [2022-11-25 23:46:36,563 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 73 SyntacticMatches, 37 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2227 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=464, Invalid=4648, Unknown=0, NotChecked=0, Total=5112 [2022-11-25 23:46:36,563 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 23 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 1250 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 1408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:36,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 96 Invalid, 1408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1250 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-11-25 23:46:36,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-25 23:46:36,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 90. [2022-11-25 23:46:36,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2696629213483146) internal successors, (113), 89 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:36,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions. [2022-11-25 23:46:36,599 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 40 [2022-11-25 23:46:36,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:36,600 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 113 transitions. [2022-11-25 23:46:36,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.409090909090909) internal successors, (106), 44 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:36,600 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions. [2022-11-25 23:46:36,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-25 23:46:36,601 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:36,601 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:36,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:36,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 23:46:36,805 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:36,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:36,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1059651906, now seen corresponding path program 7 times [2022-11-25 23:46:36,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:36,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791406095] [2022-11-25 23:46:36,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:36,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:36,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:36,997 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 23:46:36,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:36,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791406095] [2022-11-25 23:46:36,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791406095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:36,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918902125] [2022-11-25 23:46:36,999 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:46:36,999 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:36,999 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:37,000 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:37,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:46:37,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:37,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:46:37,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:37,208 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 23:46:37,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:37,294 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-25 23:46:37,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918902125] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:37,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1842692648] [2022-11-25 23:46:37,297 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:37,297 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:37,298 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:37,298 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:37,298 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:37,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:37,347 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:37,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:37,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:37,359 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:46:37,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:37,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:37,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:37,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:37,460 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:46:37,461 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 244 treesize of output 232 [2022-11-25 23:46:37,512 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 [2022-11-25 23:46:37,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:38,519 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3100#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:38,519 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:38,519 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:38,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-11-25 23:46:38,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078288957] [2022-11-25 23:46:38,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:38,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-25 23:46:38,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:38,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-25 23:46:38,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2022-11-25 23:46:38,521 INFO L87 Difference]: Start difference. First operand 90 states and 113 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:38,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:38,809 INFO L93 Difference]: Finished difference Result 190 states and 238 transitions. [2022-11-25 23:46:38,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-25 23:46:38,810 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-11-25 23:46:38,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:38,811 INFO L225 Difference]: With dead ends: 190 [2022-11-25 23:46:38,811 INFO L226 Difference]: Without dead ends: 86 [2022-11-25 23:46:38,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 84 SyntacticMatches, 28 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2022-11-25 23:46:38,812 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 41 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:38,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 11 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:46:38,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-25 23:46:38,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-25 23:46:38,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.2588235294117647) internal successors, (107), 85 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:38,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 107 transitions. [2022-11-25 23:46:38,836 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 107 transitions. Word has length 41 [2022-11-25 23:46:38,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:38,837 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 107 transitions. [2022-11-25 23:46:38,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:38,837 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 107 transitions. [2022-11-25 23:46:38,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-25 23:46:38,838 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:38,838 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:38,849 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-25 23:46:39,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,044 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:39,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:39,044 INFO L85 PathProgramCache]: Analyzing trace with hash 190076756, now seen corresponding path program 8 times [2022-11-25 23:46:39,045 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:39,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071154932] [2022-11-25 23:46:39,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:39,045 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:39,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:39,272 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-25 23:46:39,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:39,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071154932] [2022-11-25 23:46:39,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071154932] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:39,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309083765] [2022-11-25 23:46:39,273 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:46:39,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:39,274 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:39,275 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:39,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:46:39,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:46:39,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:39,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-25 23:46:39,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:39,546 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-25 23:46:39,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:39,664 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-11-25 23:46:39,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309083765] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:39,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [97237805] [2022-11-25 23:46:39,668 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:39,668 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:39,669 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:39,669 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:39,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:39,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:39,715 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:39,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:39,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:39,761 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:39,761 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:39,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:39,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:39,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:39,845 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:46:39,876 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:46:39,877 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 234 treesize of output 233 [2022-11-25 23:46:39,964 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 [2022-11-25 23:46:40,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:40,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3918#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:40,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:40,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:40,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2022-11-25 23:46:40,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462660299] [2022-11-25 23:46:40,878 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:40,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:46:40,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:40,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:46:40,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:46:40,879 INFO L87 Difference]: Start difference. First operand 86 states and 107 transitions. Second operand has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:41,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:46:41,251 INFO L93 Difference]: Finished difference Result 121 states and 155 transitions. [2022-11-25 23:46:41,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-25 23:46:41,252 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-11-25 23:46:41,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:46:41,252 INFO L225 Difference]: With dead ends: 121 [2022-11-25 23:46:41,253 INFO L226 Difference]: Without dead ends: 50 [2022-11-25 23:46:41,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 93 SyntacticMatches, 24 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:46:41,254 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 68 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:46:41,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 15 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:46:41,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-25 23:46:41,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-11-25 23:46:41,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 49 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) [2022-11-25 23:46:41,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 58 transitions. [2022-11-25 23:46:41,265 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 58 transitions. Word has length 42 [2022-11-25 23:46:41,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:46:41,265 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 58 transitions. [2022-11-25 23:46:41,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.7) internal successors, (54), 20 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:46:41,265 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 58 transitions. [2022-11-25 23:46:41,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-25 23:46:41,266 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:46:41,266 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:46:41,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:46:41,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:41,472 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:46:41,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:46:41,473 INFO L85 PathProgramCache]: Analyzing trace with hash 775002255, now seen corresponding path program 9 times [2022-11-25 23:46:41,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:46:41,473 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245960394] [2022-11-25 23:46:41,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:46:41,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:46:41,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:46:48,695 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 2 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:48,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:46:48,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245960394] [2022-11-25 23:46:48,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1245960394] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:46:48,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384822411] [2022-11-25 23:46:48,696 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:46:48,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:46:48,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:46:48,697 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:46:48,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:46:48,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:46:48,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:46:48,812 WARN L261 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 150 conjunts are in the unsatisfiable core [2022-11-25 23:46:48,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:46:48,931 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 15 treesize of output 11 [2022-11-25 23:46:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:46:50,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:46:51,881 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:46:51,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384822411] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:46:51,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1140201381] [2022-11-25 23:46:51,886 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:46:51,887 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:46:51,887 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:46:51,888 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:46:51,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:46:51,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:51,936 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:46:51,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:46:51,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:51,988 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:46:51,989 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:46:52,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:52,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:46:52,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:52,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:46:52,087 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:46:52,089 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 244 treesize of output 232 [2022-11-25 23:46:52,137 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 [2022-11-25 23:46:52,378 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:46:54,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4613#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:46:54,552 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:46:54,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:46:54,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 18, 13] total 56 [2022-11-25 23:46:54,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743583561] [2022-11-25 23:46:54,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:46:54,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-25 23:46:54,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:46:54,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-25 23:46:54,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=3451, Unknown=0, NotChecked=0, Total=3660 [2022-11-25 23:46:54,556 INFO L87 Difference]: Start difference. First operand 50 states and 58 transitions. Second operand has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:01,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:01,354 INFO L93 Difference]: Finished difference Result 112 states and 140 transitions. [2022-11-25 23:47:01,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-25 23:47:01,355 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-11-25 23:47:01,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:01,356 INFO L225 Difference]: With dead ends: 112 [2022-11-25 23:47:01,356 INFO L226 Difference]: Without dead ends: 109 [2022-11-25 23:47:01,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 94 SyntacticMatches, 40 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2794 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=525, Invalid=6785, Unknown=0, NotChecked=0, Total=7310 [2022-11-25 23:47:01,359 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 2386 mSolverCounterSat, 518 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2904 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 518 IncrementalHoareTripleChecker+Valid, 2386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:01,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 61 Invalid, 2904 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [518 Valid, 2386 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-25 23:47:01,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-25 23:47:01,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 51. [2022-11-25 23:47:01,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.18) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:01,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 59 transitions. [2022-11-25 23:47:01,391 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 59 transitions. Word has length 49 [2022-11-25 23:47:01,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:01,391 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 59 transitions. [2022-11-25 23:47:01,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.3214285714285716) internal successors, (130), 56 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:01,392 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 59 transitions. [2022-11-25 23:47:01,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-25 23:47:01,393 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:01,393 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:01,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:01,606 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:01,606 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:01,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:01,607 INFO L85 PathProgramCache]: Analyzing trace with hash -1745466079, now seen corresponding path program 10 times [2022-11-25 23:47:01,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:01,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220639463] [2022-11-25 23:47:01,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:01,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:01,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:01,819 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-25 23:47:01,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:01,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220639463] [2022-11-25 23:47:01,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220639463] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:01,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916278835] [2022-11-25 23:47:01,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:47:01,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:01,821 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:01,822 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:01,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:47:01,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:01,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:47:01,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:02,112 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-25 23:47:02,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:02,246 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-25 23:47:02,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916278835] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:02,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1452994735] [2022-11-25 23:47:02,248 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:47:02,248 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:02,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:02,248 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:02,249 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:02,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:02,298 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:47:02,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:47:02,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:02,348 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:47:02,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:47:02,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:02,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:47:02,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:02,432 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:47:02,459 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:47:02,460 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 234 treesize of output 233 [2022-11-25 23:47:02,548 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 [2022-11-25 23:47:02,760 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:03,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5292#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:03,172 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:03,172 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:03,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-25 23:47:03,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097464149] [2022-11-25 23:47:03,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:03,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:47:03,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:03,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:47:03,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:47:03,174 INFO L87 Difference]: Start difference. First operand 51 states and 59 transitions. Second operand has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-11-25 23:47:03,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:03,502 INFO L93 Difference]: Finished difference Result 132 states and 155 transitions. [2022-11-25 23:47:03,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:47:03,503 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-25 23:47:03,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:03,504 INFO L225 Difference]: With dead ends: 132 [2022-11-25 23:47:03,504 INFO L226 Difference]: Without dead ends: 52 [2022-11-25 23:47:03,505 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 123 SyntacticMatches, 15 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2022-11-25 23:47:03,505 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:03,506 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 9 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:47:03,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-11-25 23:47:03,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-11-25 23:47:03,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 51 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:03,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2022-11-25 23:47:03,535 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 50 [2022-11-25 23:47:03,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:03,535 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2022-11-25 23:47:03,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.95) internal successors, (39), 20 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) [2022-11-25 23:47:03,536 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2022-11-25 23:47:03,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-25 23:47:03,536 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:03,537 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:03,543 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:03,743 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-25 23:47:03,743 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:03,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:03,743 INFO L85 PathProgramCache]: Analyzing trace with hash 738475339, now seen corresponding path program 11 times [2022-11-25 23:47:03,743 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:03,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353198350] [2022-11-25 23:47:03,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:03,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:04,040 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 23:47:04,040 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:04,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353198350] [2022-11-25 23:47:04,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353198350] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:04,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044539242] [2022-11-25 23:47:04,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:47:04,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:04,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:04,042 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:04,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:47:04,156 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:47:04,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:04,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-25 23:47:04,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:04,296 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 23:47:04,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:04,421 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2022-11-25 23:47:04,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044539242] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:04,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [21670026] [2022-11-25 23:47:04,423 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:47:04,424 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:04,424 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:04,424 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:04,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:04,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:04,470 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:47:04,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:47:04,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:04,482 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:47:04,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:04,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:47:04,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:04,562 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:47:04,588 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:47:04,589 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 234 treesize of output 233 [2022-11-25 23:47:04,680 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 [2022-11-25 23:47:04,899 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:05,624 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5982#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:05,624 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:05,624 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:05,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-11-25 23:47:05,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485063074] [2022-11-25 23:47:05,625 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:05,625 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-25 23:47:05,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:05,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-25 23:47:05,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:47:05,626 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:05,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:05,910 INFO L93 Difference]: Finished difference Result 98 states and 119 transitions. [2022-11-25 23:47:05,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:47:05,910 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2022-11-25 23:47:05,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:05,911 INFO L225 Difference]: With dead ends: 98 [2022-11-25 23:47:05,911 INFO L226 Difference]: Without dead ends: 59 [2022-11-25 23:47:05,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 105 SyntacticMatches, 36 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2022-11-25 23:47:05,913 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 196 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:05,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 11 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:47:05,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-25 23:47:05,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-11-25 23:47:05,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 58 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:05,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 67 transitions. [2022-11-25 23:47:05,941 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 67 transitions. Word has length 51 [2022-11-25 23:47:05,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:05,941 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 67 transitions. [2022-11-25 23:47:05,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.65) internal successors, (53), 20 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:05,942 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 67 transitions. [2022-11-25 23:47:05,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-25 23:47:05,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:05,942 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:05,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:06,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-25 23:47:06,143 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:06,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:06,143 INFO L85 PathProgramCache]: Analyzing trace with hash 7452930, now seen corresponding path program 12 times [2022-11-25 23:47:06,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:06,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581332915] [2022-11-25 23:47:06,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:06,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:06,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:15,854 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 4 proven. 131 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:15,855 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:15,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581332915] [2022-11-25 23:47:15,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581332915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:15,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565788229] [2022-11-25 23:47:15,855 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:47:15,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:15,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:15,857 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:15,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:47:15,996 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:47:15,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:16,002 WARN L261 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 182 conjunts are in the unsatisfiable core [2022-11-25 23:47:16,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:16,123 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 15 treesize of output 11 [2022-11-25 23:47:18,897 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:18,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:20,647 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:47:20,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565788229] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:20,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1732760654] [2022-11-25 23:47:20,650 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:47:20,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:20,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:20,650 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:20,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:20,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:20,697 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:47:20,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:47:20,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:20,711 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:47:20,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:20,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:47:20,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:20,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:20,809 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:47:20,809 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 244 treesize of output 232 [2022-11-25 23:47:20,860 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 [2022-11-25 23:47:21,060 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:24,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6711#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:24,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:24,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:24,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 21, 15] total 69 [2022-11-25 23:47:24,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73487761] [2022-11-25 23:47:24,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:24,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-25 23:47:24,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:24,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-25 23:47:24,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=5132, Unknown=0, NotChecked=0, Total=5402 [2022-11-25 23:47:24,665 INFO L87 Difference]: Start difference. First operand 59 states and 67 transitions. Second operand has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:35,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:35,869 INFO L93 Difference]: Finished difference Result 225 states and 266 transitions. [2022-11-25 23:47:35,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-25 23:47:35,870 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-25 23:47:35,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:35,871 INFO L225 Difference]: With dead ends: 225 [2022-11-25 23:47:35,871 INFO L226 Difference]: Without dead ends: 156 [2022-11-25 23:47:35,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 102 SyntacticMatches, 55 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5394 ImplicationChecksByTransitivity, 17.0s TimeCoverageRelationStatistics Valid=1031, Invalid=12541, Unknown=0, NotChecked=0, Total=13572 [2022-11-25 23:47:35,877 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 53 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 3004 mSolverCounterSat, 812 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 3816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 812 IncrementalHoareTripleChecker+Valid, 3004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:35,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 133 Invalid, 3816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [812 Valid, 3004 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-25 23:47:35,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-11-25 23:47:35,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 124. [2022-11-25 23:47:35,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.1788617886178863) internal successors, (145), 123 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:35,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 145 transitions. [2022-11-25 23:47:35,944 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 145 transitions. Word has length 58 [2022-11-25 23:47:35,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:35,944 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 145 transitions. [2022-11-25 23:47:35,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.246376811594203) internal successors, (155), 69 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:35,945 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 145 transitions. [2022-11-25 23:47:35,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-25 23:47:35,946 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:35,946 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:35,952 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:36,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:36,150 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:36,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:36,151 INFO L85 PathProgramCache]: Analyzing trace with hash -794807180, now seen corresponding path program 13 times [2022-11-25 23:47:36,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:36,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345671791] [2022-11-25 23:47:36,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:36,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:36,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:36,461 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-25 23:47:36,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:36,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345671791] [2022-11-25 23:47:36,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345671791] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:36,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199730590] [2022-11-25 23:47:36,462 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:47:36,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:36,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:36,463 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:36,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:47:36,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:36,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:47:36,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:47:36,750 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-25 23:47:36,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:47:36,870 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2022-11-25 23:47:36,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199730590] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:47:36,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595577973] [2022-11-25 23:47:36,872 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:47:36,872 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:47:36,873 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:47:36,873 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:47:36,873 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:47:36,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:36,922 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:47:36,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:47:36,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:36,933 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:47:36,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:36,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:47:37,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:37,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:47:37,053 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:47:37,054 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 244 treesize of output 232 [2022-11-25 23:47:37,103 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 [2022-11-25 23:47:37,311 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:47:38,053 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7858#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:47:38,054 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:47:38,054 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:47:38,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-11-25 23:47:38,054 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686303495] [2022-11-25 23:47:38,054 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:47:38,055 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-25 23:47:38,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:47:38,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-25 23:47:38,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2022-11-25 23:47:38,056 INFO L87 Difference]: Start difference. First operand 124 states and 145 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:38,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:47:38,378 INFO L93 Difference]: Finished difference Result 171 states and 205 transitions. [2022-11-25 23:47:38,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-25 23:47:38,379 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-25 23:47:38,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:47:38,380 INFO L225 Difference]: With dead ends: 171 [2022-11-25 23:47:38,380 INFO L226 Difference]: Without dead ends: 68 [2022-11-25 23:47:38,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 131 SyntacticMatches, 36 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1077 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2022-11-25 23:47:38,381 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 354 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 98 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 281 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 98 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:47:38,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 13 Invalid, 281 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [98 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:47:38,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-25 23:47:38,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2022-11-25 23:47:38,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1343283582089552) internal successors, (76), 67 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:38,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 76 transitions. [2022-11-25 23:47:38,417 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 76 transitions. Word has length 60 [2022-11-25 23:47:38,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:47:38,417 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 76 transitions. [2022-11-25 23:47:38,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:47:38,418 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 76 transitions. [2022-11-25 23:47:38,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-25 23:47:38,418 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:47:38,419 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:47:38,424 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-25 23:47:38,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-25 23:47:38,619 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:47:38,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:47:38,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1806888303, now seen corresponding path program 14 times [2022-11-25 23:47:38,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:47:38,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297178760] [2022-11-25 23:47:38,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:47:38,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:47:38,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:47:52,491 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 9 proven. 180 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:47:52,491 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:47:52,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297178760] [2022-11-25 23:47:52,492 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297178760] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:47:52,492 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250691977] [2022-11-25 23:47:52,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:47:52,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:47:52,492 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:47:52,493 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:47:52,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:47:52,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-25 23:47:52,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:47:52,672 WARN L261 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 218 conjunts are in the unsatisfiable core [2022-11-25 23:47:52,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:48:04,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:04,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:04,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:04,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:04,992 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:48:05,052 INFO L321 Elim1Store]: treesize reduction 20, result has 77.8 percent of original size [2022-11-25 23:48:05,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 5 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 97 treesize of output 90 [2022-11-25 23:48:05,386 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 6 proven. 168 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-11-25 23:48:05,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:48:17,620 INFO L321 Elim1Store]: treesize reduction 206, result has 57.3 percent of original size [2022-11-25 23:48:17,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 102 treesize of output 293 [2022-11-25 23:48:19,165 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 0 proven. 179 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-25 23:48:19,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250691977] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:48:19,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378987853] [2022-11-25 23:48:19,166 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:48:19,166 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:48:19,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:48:19,167 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:48:19,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:48:19,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:19,221 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:48:19,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:48:19,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:19,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:48:19,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:19,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:48:19,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:19,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:48:19,332 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:48:19,333 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 244 treesize of output 232 [2022-11-25 23:48:19,386 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 [2022-11-25 23:48:19,601 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:48:26,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8863#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:48:26,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:48:26,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:48:26,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 37, 40] total 125 [2022-11-25 23:48:26,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719632376] [2022-11-25 23:48:26,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:48:26,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-11-25 23:48:26,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:48:26,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-11-25 23:48:26,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1014, Invalid=15755, Unknown=1, NotChecked=0, Total=16770 [2022-11-25 23:48:26,118 INFO L87 Difference]: Start difference. First operand 68 states and 76 transitions. Second operand has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:12,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:12,745 INFO L93 Difference]: Finished difference Result 294 states and 346 transitions. [2022-11-25 23:49:12,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-11-25 23:49:12,745 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 0 states have call successors, (0), 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 67 [2022-11-25 23:49:12,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:12,747 INFO L225 Difference]: With dead ends: 294 [2022-11-25 23:49:12,747 INFO L226 Difference]: Without dead ends: 178 [2022-11-25 23:49:12,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 88 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14366 ImplicationChecksByTransitivity, 66.5s TimeCoverageRelationStatistics Valid=3334, Invalid=35670, Unknown=2, NotChecked=0, Total=39006 [2022-11-25 23:49:12,751 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 287 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 7102 mSolverCounterSat, 1939 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 9041 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1939 IncrementalHoareTripleChecker+Valid, 7102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:12,751 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 194 Invalid, 9041 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1939 Valid, 7102 Invalid, 0 Unknown, 0 Unchecked, 11.8s Time] [2022-11-25 23:49:12,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-11-25 23:49:12,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 118. [2022-11-25 23:49:12,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 117 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:12,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 135 transitions. [2022-11-25 23:49:12,839 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 135 transitions. Word has length 67 [2022-11-25 23:49:12,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:12,839 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 135 transitions. [2022-11-25 23:49:12,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:12,839 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 135 transitions. [2022-11-25 23:49:12,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-25 23:49:12,840 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:12,840 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:12,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:13,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-25 23:49:13,041 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:13,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:13,041 INFO L85 PathProgramCache]: Analyzing trace with hash 2013094678, now seen corresponding path program 15 times [2022-11-25 23:49:13,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:13,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361110808] [2022-11-25 23:49:13,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:13,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:13,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:13,363 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-25 23:49:13,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:13,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361110808] [2022-11-25 23:49:13,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361110808] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:13,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382133355] [2022-11-25 23:49:13,364 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:49:13,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:13,365 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:13,367 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:13,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:49:13,517 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:49:13,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:49:13,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-25 23:49:13,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:13,830 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-25 23:49:13,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:14,056 INFO L134 CoverageAnalysis]: Checked inductivity of 203 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 154 trivial. 0 not checked. [2022-11-25 23:49:14,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382133355] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:14,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057824667] [2022-11-25 23:49:14,058 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:49:14,058 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:14,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:14,059 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:14,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:14,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:14,105 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:49:14,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:49:14,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:14,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:49:14,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:14,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:49:14,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:14,208 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:49:14,237 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:49:14,237 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 234 treesize of output 233 [2022-11-25 23:49:14,328 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 [2022-11-25 23:49:14,527 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:15,577 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10250#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:15,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:15,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:49:15,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2022-11-25 23:49:15,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601440840] [2022-11-25 23:49:15,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:15,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:49:15,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:15,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:49:15,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1121, Unknown=0, NotChecked=0, Total=1332 [2022-11-25 23:49:15,580 INFO L87 Difference]: Start difference. First operand 118 states and 135 transitions. Second operand has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:16,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:16,267 INFO L93 Difference]: Finished difference Result 170 states and 199 transitions. [2022-11-25 23:49:16,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:49:16,267 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-11-25 23:49:16,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:16,268 INFO L225 Difference]: With dead ends: 170 [2022-11-25 23:49:16,268 INFO L226 Difference]: Without dead ends: 77 [2022-11-25 23:49:16,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 145 SyntacticMatches, 42 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1892 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=393, Invalid=1677, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:49:16,269 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 170 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 627 mSolverCounterSat, 231 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 858 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 231 IncrementalHoareTripleChecker+Valid, 627 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:16,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 19 Invalid, 858 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [231 Valid, 627 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:49:16,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-25 23:49:16,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-11-25 23:49:16,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.118421052631579) internal successors, (85), 76 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:16,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2022-11-25 23:49:16,319 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 69 [2022-11-25 23:49:16,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:16,319 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2022-11-25 23:49:16,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.65625) internal successors, (53), 32 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:16,319 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2022-11-25 23:49:16,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-11-25 23:49:16,320 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:16,320 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:16,325 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:16,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:16,520 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:16,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:16,521 INFO L85 PathProgramCache]: Analyzing trace with hash 1853093538, now seen corresponding path program 16 times [2022-11-25 23:49:16,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:16,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1212824528] [2022-11-25 23:49:16,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:16,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:16,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:33,436 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 21 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:33,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:33,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1212824528] [2022-11-25 23:49:33,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1212824528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:33,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129285822] [2022-11-25 23:49:33,437 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:49:33,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:33,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:33,438 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:33,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:49:33,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:33,604 WARN L261 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 250 conjunts are in the unsatisfiable core [2022-11-25 23:49:33,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:33,827 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 13 treesize of output 9 [2022-11-25 23:49:38,411 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:49:38,414 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:49:38,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 14 [2022-11-25 23:49:38,572 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:49:38,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:41,551 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 224 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-25 23:49:41,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [129285822] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:41,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137669636] [2022-11-25 23:49:41,553 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:49:41,553 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:41,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:41,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:41,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:41,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:41,603 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:49:41,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:49:41,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:41,652 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:49:41,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:49:41,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:41,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:49:41,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:41,726 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:49:41,753 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:49:41,754 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 234 treesize of output 233 [2022-11-25 23:49:41,839 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 [2022-11-25 23:49:42,053 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:49:45,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11283#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:49:45,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:49:45,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:49:45,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 27, 19] total 79 [2022-11-25 23:49:45,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805473101] [2022-11-25 23:49:45,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:49:45,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-11-25 23:49:45,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:49:45,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-11-25 23:49:45,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=6574, Unknown=0, NotChecked=0, Total=6972 [2022-11-25 23:49:45,116 INFO L87 Difference]: Start difference. First operand 77 states and 85 transitions. Second operand has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:57,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:49:57,875 INFO L93 Difference]: Finished difference Result 201 states and 231 transitions. [2022-11-25 23:49:57,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-25 23:49:57,875 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2022-11-25 23:49:57,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:49:57,876 INFO L225 Difference]: With dead ends: 201 [2022-11-25 23:49:57,876 INFO L226 Difference]: Without dead ends: 198 [2022-11-25 23:49:57,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 149 SyntacticMatches, 70 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7225 ImplicationChecksByTransitivity, 20.7s TimeCoverageRelationStatistics Valid=1101, Invalid=13905, Unknown=0, NotChecked=0, Total=15006 [2022-11-25 23:49:57,878 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 42 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 4354 mSolverCounterSat, 560 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 560 IncrementalHoareTripleChecker+Valid, 4354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:49:57,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 95 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [560 Valid, 4354 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-11-25 23:49:57,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-25 23:49:58,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 138. [2022-11-25 23:49:58,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 1.145985401459854) internal successors, (157), 137 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:58,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 157 transitions. [2022-11-25 23:49:58,003 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 157 transitions. Word has length 76 [2022-11-25 23:49:58,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:49:58,004 INFO L495 AbstractCegarLoop]: Abstraction has 138 states and 157 transitions. [2022-11-25 23:49:58,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.3797468354430378) internal successors, (188), 79 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:49:58,005 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 157 transitions. [2022-11-25 23:49:58,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-11-25 23:49:58,005 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:49:58,005 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:49:58,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-25 23:49:58,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:49:58,206 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:49:58,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:49:58,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1610592622, now seen corresponding path program 17 times [2022-11-25 23:49:58,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:49:58,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326171101] [2022-11-25 23:49:58,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:49:58,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:49:58,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:49:58,564 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-25 23:49:58,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:49:58,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326171101] [2022-11-25 23:49:58,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326171101] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:49:58,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270403431] [2022-11-25 23:49:58,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:49:58,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:49:58,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:49:58,570 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:49:58,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-25 23:49:58,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-25 23:49:58,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:49:58,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:49:58,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:49:59,175 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-25 23:49:59,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:49:59,465 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-11-25 23:49:59,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270403431] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:49:59,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1394416357] [2022-11-25 23:49:59,467 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:49:59,468 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:49:59,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:49:59,468 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:49:59,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:49:59,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:59,519 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:49:59,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:49:59,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:59,576 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:49:59,576 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:49:59,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:59,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:49:59,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:59,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:49:59,686 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:49:59,686 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 244 treesize of output 232 [2022-11-25 23:49:59,735 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 [2022-11-25 23:49:59,949 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:01,204 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12513#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:01,204 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:01,204 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:50:01,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2022-11-25 23:50:01,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618204764] [2022-11-25 23:50:01,205 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:01,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:50:01,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:01,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:50:01,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2022-11-25 23:50:01,207 INFO L87 Difference]: Start difference. First operand 138 states and 157 transitions. Second operand has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:02,068 INFO L93 Difference]: Finished difference Result 324 states and 369 transitions. [2022-11-25 23:50:02,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-25 23:50:02,069 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 77 [2022-11-25 23:50:02,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:02,069 INFO L225 Difference]: With dead ends: 324 [2022-11-25 23:50:02,069 INFO L226 Difference]: Without dead ends: 139 [2022-11-25 23:50:02,070 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 176 SyntacticMatches, 40 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=349, Invalid=1373, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 23:50:02,071 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:02,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 17 Invalid, 750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:50:02,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-25 23:50:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-11-25 23:50:02,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 138 states have (on average 1.144927536231884) internal successors, (158), 138 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 158 transitions. [2022-11-25 23:50:02,205 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 158 transitions. Word has length 77 [2022-11-25 23:50:02,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:02,206 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 158 transitions. [2022-11-25 23:50:02,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.6551724137931034) internal successors, (48), 29 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:02,206 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 158 transitions. [2022-11-25 23:50:02,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-11-25 23:50:02,207 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:02,207 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:02,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:02,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:02,415 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:02,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:02,415 INFO L85 PathProgramCache]: Analyzing trace with hash 621213444, now seen corresponding path program 18 times [2022-11-25 23:50:02,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:02,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910205501] [2022-11-25 23:50:02,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:02,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:02,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:02,773 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-25 23:50:02,774 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:50:02,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910205501] [2022-11-25 23:50:02,774 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910205501] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:50:02,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [959645206] [2022-11-25 23:50:02,774 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:50:02,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:02,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:02,776 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:02,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-25 23:50:02,924 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:50:02,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:50:02,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:50:02,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:50:03,378 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-25 23:50:03,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:50:03,831 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2022-11-25 23:50:03,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [959645206] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:50:03,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1246419694] [2022-11-25 23:50:03,833 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:50:03,833 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:50:03,834 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:50:03,834 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:50:03,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:50:03,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:03,892 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:50:03,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:50:03,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:03,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:50:03,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:03,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:50:03,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:03,988 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:50:04,017 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:50:04,018 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 234 treesize of output 233 [2022-11-25 23:50:04,110 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 [2022-11-25 23:50:04,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:06,011 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13953#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:06,012 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:06,012 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:50:06,012 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-11-25 23:50:06,012 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537889505] [2022-11-25 23:50:06,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:06,013 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 23:50:06,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:06,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 23:50:06,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=2049, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:50:06,018 INFO L87 Difference]: Start difference. First operand 139 states and 158 transitions. Second operand has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:06,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:50:06,762 INFO L93 Difference]: Finished difference Result 206 states and 239 transitions. [2022-11-25 23:50:06,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-25 23:50:06,762 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 78 [2022-11-25 23:50:06,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:50:06,763 INFO L225 Difference]: With dead ends: 206 [2022-11-25 23:50:06,763 INFO L226 Difference]: Without dead ends: 86 [2022-11-25 23:50:06,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 172 SyntacticMatches, 33 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2044 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=520, Invalid=2902, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 23:50:06,764 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 162 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 184 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 601 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 184 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:50:06,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [162 Valid, 19 Invalid, 601 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [184 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:50:06,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-25 23:50:06,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-11-25 23:50:06,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.1058823529411765) internal successors, (94), 85 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:06,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2022-11-25 23:50:06,861 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 78 [2022-11-25 23:50:06,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:50:06,862 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2022-11-25 23:50:06,862 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7045454545454546) internal successors, (75), 44 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:50:06,862 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2022-11-25 23:50:06,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-11-25 23:50:06,863 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:50:06,864 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:50:06,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-25 23:50:07,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:07,070 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:50:07,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:50:07,071 INFO L85 PathProgramCache]: Analyzing trace with hash 1518045775, now seen corresponding path program 19 times [2022-11-25 23:50:07,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:50:07,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558672740] [2022-11-25 23:50:07,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:50:07,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:50:07,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:30,123 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 25 proven. 299 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:30,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:50:30,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1558672740] [2022-11-25 23:50:30,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1558672740] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:50:30,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614487529] [2022-11-25 23:50:30,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:50:30,125 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:50:30,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:50:30,138 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:50:30,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-25 23:50:30,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:50:30,338 WARN L261 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 284 conjunts are in the unsatisfiable core [2022-11-25 23:50:30,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:50:30,814 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 15 treesize of output 11 [2022-11-25 23:50:37,389 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:50:37,392 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:50:37,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 14 [2022-11-25 23:50:37,599 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:50:37,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:50:41,871 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2022-11-25 23:50:41,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614487529] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:50:41,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [248103932] [2022-11-25 23:50:41,873 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:50:41,874 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:50:41,874 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:50:41,874 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:50:41,874 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:50:41,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:41,925 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:50:41,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:50:41,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:41,979 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:50:41,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:50:42,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:42,010 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:50:42,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:42,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:50:42,091 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:50:42,092 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 244 treesize of output 232 [2022-11-25 23:50:42,148 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 [2022-11-25 23:50:42,355 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:50:46,666 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15147#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:50:46,666 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:50:46,667 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:50:46,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 30, 21] total 93 [2022-11-25 23:50:46,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949027059] [2022-11-25 23:50:46,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:50:46,667 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-25 23:50:46,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:50:46,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-25 23:50:46,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=470, Invalid=9036, Unknown=0, NotChecked=0, Total=9506 [2022-11-25 23:50:46,670 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:07,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:07,742 INFO L93 Difference]: Finished difference Result 321 states and 362 transitions. [2022-11-25 23:51:07,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-11-25 23:51:07,743 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 85 [2022-11-25 23:51:07,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:07,745 INFO L225 Difference]: With dead ends: 321 [2022-11-25 23:51:07,745 INFO L226 Difference]: Without dead ends: 228 [2022-11-25 23:51:07,746 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 169 SyntacticMatches, 72 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9974 ImplicationChecksByTransitivity, 32.9s TimeCoverageRelationStatistics Valid=1640, Invalid=21312, Unknown=0, NotChecked=0, Total=22952 [2022-11-25 23:51:07,747 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 49 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 5392 mSolverCounterSat, 952 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 6344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 952 IncrementalHoareTripleChecker+Valid, 5392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:07,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 165 Invalid, 6344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [952 Valid, 5392 Invalid, 0 Unknown, 0 Unchecked, 7.7s Time] [2022-11-25 23:51:07,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2022-11-25 23:51:07,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 181. [2022-11-25 23:51:07,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.1222222222222222) internal successors, (202), 180 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:07,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2022-11-25 23:51:07,904 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 85 [2022-11-25 23:51:07,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:07,904 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2022-11-25 23:51:07,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 2.3118279569892475) internal successors, (215), 93 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:07,904 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2022-11-25 23:51:07,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-11-25 23:51:07,905 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:07,905 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:51:07,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:08,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:08,106 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:08,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:08,106 INFO L85 PathProgramCache]: Analyzing trace with hash -375630095, now seen corresponding path program 20 times [2022-11-25 23:51:08,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:08,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311380916] [2022-11-25 23:51:08,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:08,107 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:08,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:51:08,625 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-25 23:51:08,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:51:08,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311380916] [2022-11-25 23:51:08,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311380916] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:51:08,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120931938] [2022-11-25 23:51:08,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:51:08,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:08,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:51:08,627 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:51:08,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-25 23:51:08,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 23:51:08,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:51:08,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-25 23:51:08,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:09,345 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-25 23:51:09,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:51:09,703 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2022-11-25 23:51:09,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120931938] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:51:09,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1201850042] [2022-11-25 23:51:09,705 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:51:09,705 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:51:09,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:51:09,706 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:51:09,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:51:09,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:09,760 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:51:09,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:51:09,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:09,805 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:51:09,805 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:51:09,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:09,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:51:09,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:09,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:09,900 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:51:09,900 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 244 treesize of output 232 [2022-11-25 23:51:09,947 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 [2022-11-25 23:51:10,155 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:51:11,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16801#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:51:11,974 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:51:11,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:51:11,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2022-11-25 23:51:11,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435411397] [2022-11-25 23:51:11,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:51:11,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-25 23:51:11,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:51:11,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-25 23:51:11,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1672, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:51:11,977 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:12,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:51:12,896 INFO L93 Difference]: Finished difference Result 246 states and 280 transitions. [2022-11-25 23:51:12,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-25 23:51:12,897 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 87 [2022-11-25 23:51:12,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:51:12,897 INFO L225 Difference]: With dead ends: 246 [2022-11-25 23:51:12,897 INFO L226 Difference]: Without dead ends: 95 [2022-11-25 23:51:12,898 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 183 SyntacticMatches, 64 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3526 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=585, Invalid=2495, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:51:12,899 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 305 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 637 mSolverCounterSat, 375 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 305 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 1012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 375 IncrementalHoareTripleChecker+Valid, 637 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:51:12,899 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [305 Valid, 13 Invalid, 1012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [375 Valid, 637 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:51:12,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-25 23:51:13,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-11-25 23:51:13,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0957446808510638) internal successors, (103), 94 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:13,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2022-11-25 23:51:13,007 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 87 [2022-11-25 23:51:13,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:51:13,007 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2022-11-25 23:51:13,008 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.975) internal successors, (79), 40 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:51:13,008 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2022-11-25 23:51:13,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-11-25 23:51:13,009 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:51:13,009 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:51:13,016 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-25 23:51:13,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:13,217 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:51:13,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:51:13,217 INFO L85 PathProgramCache]: Analyzing trace with hash -1520980926, now seen corresponding path program 21 times [2022-11-25 23:51:13,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:51:13,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902141781] [2022-11-25 23:51:13,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:51:13,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:51:13,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:51:41,735 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 42 proven. 363 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:51:41,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:51:41,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902141781] [2022-11-25 23:51:41,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902141781] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:51:41,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354123964] [2022-11-25 23:51:41,735 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:51:41,736 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:51:41,736 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:51:41,737 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:51:41,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-25 23:51:41,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:51:41,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:51:41,964 WARN L261 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 318 conjunts are in the unsatisfiable core [2022-11-25 23:51:41,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:51:42,191 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 15 treesize of output 11 [2022-11-25 23:51:49,776 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 405 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:51:49,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:51:55,109 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-11-25 23:51:55,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354123964] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:51:55,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099297456] [2022-11-25 23:51:55,111 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:51:55,111 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:51:55,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:51:55,112 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:51:55,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:51:55,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:55,161 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:51:55,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:51:55,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:55,214 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:51:55,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:51:55,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:55,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:51:55,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:55,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:51:55,324 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:51:55,325 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 244 treesize of output 232 [2022-11-25 23:51:55,375 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 [2022-11-25 23:51:55,579 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:52:00,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18166#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:52:00,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:52:00,633 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:52:00,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 33, 23] total 101 [2022-11-25 23:52:00,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457522515] [2022-11-25 23:52:00,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:52:00,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-11-25 23:52:00,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:52:00,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-11-25 23:52:00,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=10645, Unknown=0, NotChecked=0, Total=11130 [2022-11-25 23:52:00,638 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:30,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:52:30,213 INFO L93 Difference]: Finished difference Result 270 states and 309 transitions. [2022-11-25 23:52:30,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-25 23:52:30,214 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-11-25 23:52:30,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:52:30,216 INFO L225 Difference]: With dead ends: 270 [2022-11-25 23:52:30,217 INFO L226 Difference]: Without dead ends: 267 [2022-11-25 23:52:30,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 195 SyntacticMatches, 74 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11804 ImplicationChecksByTransitivity, 42.0s TimeCoverageRelationStatistics Valid=1904, Invalid=26826, Unknown=0, NotChecked=0, Total=28730 [2022-11-25 23:52:30,220 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 71 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 6563 mSolverCounterSat, 1272 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 7835 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1272 IncrementalHoareTripleChecker+Valid, 6563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:52:30,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 87 Invalid, 7835 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1272 Valid, 6563 Invalid, 0 Unknown, 0 Unchecked, 10.2s Time] [2022-11-25 23:52:30,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2022-11-25 23:52:30,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 161. [2022-11-25 23:52:30,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.125) internal successors, (180), 160 states have internal predecessors, (180), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:30,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 180 transitions. [2022-11-25 23:52:30,448 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 180 transitions. Word has length 94 [2022-11-25 23:52:30,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:52:30,448 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 180 transitions. [2022-11-25 23:52:30,449 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.3267326732673266) internal successors, (235), 101 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:30,449 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 180 transitions. [2022-11-25 23:52:30,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-11-25 23:52:30,450 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:52:30,450 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:52:30,457 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-25 23:52:30,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-25 23:52:30,656 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:52:30,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:52:30,657 INFO L85 PathProgramCache]: Analyzing trace with hash 93499342, now seen corresponding path program 22 times [2022-11-25 23:52:30,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:52:30,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504230954] [2022-11-25 23:52:30,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:52:30,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:52:30,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:52:31,255 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-25 23:52:31,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:52:31,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504230954] [2022-11-25 23:52:31,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504230954] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:52:31,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44745458] [2022-11-25 23:52:31,256 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:52:31,256 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:52:31,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:52:31,257 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:52:31,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-25 23:52:31,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:52:31,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:52:31,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:52:31,858 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-25 23:52:31,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:52:32,221 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2022-11-25 23:52:32,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44745458] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:52:32,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [138056922] [2022-11-25 23:52:32,222 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:52:32,222 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:52:32,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:52:32,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:52:32,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:52:32,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:32,264 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:52:32,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:52:32,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:32,307 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:52:32,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:52:32,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:32,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:52:32,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:32,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:32,404 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:52:32,405 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 244 treesize of output 232 [2022-11-25 23:52:32,451 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 [2022-11-25 23:52:32,653 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:52:34,266 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19741#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:52:34,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:52:34,267 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:52:34,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-25 23:52:34,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732586473] [2022-11-25 23:52:34,267 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:52:34,268 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 23:52:34,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:52:34,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 23:52:34,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:52:34,269 INFO L87 Difference]: Start difference. First operand 161 states and 180 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:35,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:52:35,430 INFO L93 Difference]: Finished difference Result 381 states and 425 transitions. [2022-11-25 23:52:35,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-25 23:52:35,430 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 95 [2022-11-25 23:52:35,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:52:35,432 INFO L225 Difference]: With dead ends: 381 [2022-11-25 23:52:35,432 INFO L226 Difference]: Without dead ends: 162 [2022-11-25 23:52:35,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 218 SyntacticMatches, 50 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2022-11-25 23:52:35,434 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 734 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 857 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 734 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:52:35,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 23 Invalid, 857 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 734 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:52:35,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2022-11-25 23:52:35,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2022-11-25 23:52:35,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.124223602484472) internal successors, (181), 161 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:35,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2022-11-25 23:52:35,696 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 95 [2022-11-25 23:52:35,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:52:35,697 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2022-11-25 23:52:35,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:35,697 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2022-11-25 23:52:35,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-25 23:52:35,698 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:52:35,698 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:52:35,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-25 23:52:35,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-25 23:52:35,906 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:52:35,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:52:35,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1526203420, now seen corresponding path program 23 times [2022-11-25 23:52:35,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:52:35,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674789160] [2022-11-25 23:52:35,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:52:35,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:52:35,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:52:36,402 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-25 23:52:36,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:52:36,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674789160] [2022-11-25 23:52:36,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674789160] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:52:36,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296264009] [2022-11-25 23:52:36,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:52:36,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:52:36,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:52:36,404 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:52:36,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-25 23:52:36,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-25 23:52:36,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:52:36,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-25 23:52:36,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:52:37,069 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-25 23:52:37,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:52:37,337 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2022-11-25 23:52:37,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296264009] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:52:37,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2019906586] [2022-11-25 23:52:37,339 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:52:37,339 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:52:37,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:52:37,340 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:52:37,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:52:37,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:37,390 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:52:37,391 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:52:37,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:37,438 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:52:37,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:52:37,465 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:37,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:52:37,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:37,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:52:37,536 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:52:37,537 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 244 treesize of output 232 [2022-11-25 23:52:37,587 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 [2022-11-25 23:52:37,777 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:52:38,815 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21444#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:52:38,815 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:52:38,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:52:38,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2022-11-25 23:52:38,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835393903] [2022-11-25 23:52:38,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:52:38,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-25 23:52:38,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:52:38,817 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-25 23:52:38,817 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=1251, Unknown=0, NotChecked=0, Total=1560 [2022-11-25 23:52:38,817 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:39,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:52:39,581 INFO L93 Difference]: Finished difference Result 243 states and 276 transitions. [2022-11-25 23:52:39,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-25 23:52:39,581 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-11-25 23:52:39,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:52:39,582 INFO L225 Difference]: With dead ends: 243 [2022-11-25 23:52:39,582 INFO L226 Difference]: Without dead ends: 115 [2022-11-25 23:52:39,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 231 SyntacticMatches, 40 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=618, Invalid=1932, Unknown=0, NotChecked=0, Total=2550 [2022-11-25 23:52:39,584 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 224 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:52:39,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 9 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:52:39,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-25 23:52:39,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 104. [2022-11-25 23:52:39,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 103 states have (on average 1.087378640776699) internal successors, (112), 103 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:39,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 112 transitions. [2022-11-25 23:52:39,716 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 112 transitions. Word has length 96 [2022-11-25 23:52:39,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:52:39,716 INFO L495 AbstractCegarLoop]: Abstraction has 104 states and 112 transitions. [2022-11-25 23:52:39,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.542857142857143) internal successors, (54), 35 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:52:39,717 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 112 transitions. [2022-11-25 23:52:39,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-25 23:52:39,717 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:52:39,718 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:52:39,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-25 23:52:39,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:52:39,921 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:52:39,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:52:39,922 INFO L85 PathProgramCache]: Analyzing trace with hash -166367441, now seen corresponding path program 24 times [2022-11-25 23:52:39,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:52:39,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329082453] [2022-11-25 23:52:39,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:52:39,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:52:40,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:53:14,637 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 77 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:53:14,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:53:14,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329082453] [2022-11-25 23:53:14,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329082453] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:53:14,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377136281] [2022-11-25 23:53:14,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:53:14,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:53:14,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:53:14,639 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:53:14,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-25 23:53:14,861 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:53:14,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:53:14,870 WARN L261 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 354 conjunts are in the unsatisfiable core [2022-11-25 23:53:14,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:53:15,952 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 15 treesize of output 11 [2022-11-25 23:53:28,526 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:53:28,526 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:53:35,675 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 440 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-11-25 23:53:35,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377136281] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:53:35,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470229554] [2022-11-25 23:53:35,678 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:53:35,678 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:53:35,678 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:53:35,679 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:53:35,679 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:53:35,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:53:35,726 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:53:35,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:53:35,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:53:35,771 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:53:35,771 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:53:35,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:53:35,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:53:35,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:53:35,852 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:53:35,880 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:53:35,881 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 234 treesize of output 233 [2022-11-25 23:53:35,962 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 [2022-11-25 23:53:36,178 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:53:45,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22878#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:53:45,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:53:45,279 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:53:45,279 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 36, 25] total 114 [2022-11-25 23:53:45,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50484169] [2022-11-25 23:53:45,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:53:45,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-11-25 23:53:45,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:53:45,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-11-25 23:53:45,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=578, Invalid=13464, Unknown=0, NotChecked=0, Total=14042 [2022-11-25 23:53:45,283 INFO L87 Difference]: Start difference. First operand 104 states and 112 transitions. Second operand has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:15,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:54:15,697 INFO L93 Difference]: Finished difference Result 208 states and 236 transitions. [2022-11-25 23:54:15,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-25 23:54:15,699 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 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 103 [2022-11-25 23:54:15,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:54:15,700 INFO L225 Difference]: With dead ends: 208 [2022-11-25 23:54:15,700 INFO L226 Difference]: Without dead ends: 205 [2022-11-25 23:54:15,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 465 GetRequests, 172 SyntacticMatches, 120 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15075 ImplicationChecksByTransitivity, 56.6s TimeCoverageRelationStatistics Valid=1960, Invalid=28490, Unknown=0, NotChecked=0, Total=30450 [2022-11-25 23:54:15,703 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 103 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 7049 mSolverCounterSat, 1533 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 8582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1533 IncrementalHoareTripleChecker+Valid, 7049 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:54:15,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 97 Invalid, 8582 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1533 Valid, 7049 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2022-11-25 23:54:15,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2022-11-25 23:54:15,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 105. [2022-11-25 23:54:15,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0865384615384615) internal successors, (113), 104 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:15,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 113 transitions. [2022-11-25 23:54:15,856 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 113 transitions. Word has length 103 [2022-11-25 23:54:15,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:54:15,856 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 113 transitions. [2022-11-25 23:54:15,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 114 states have (on average 2.2719298245614037) internal successors, (259), 114 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:15,857 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 113 transitions. [2022-11-25 23:54:15,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-25 23:54:15,857 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:54:15,857 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:54:15,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-25 23:54:16,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 23:54:16,058 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:54:16,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:54:16,058 INFO L85 PathProgramCache]: Analyzing trace with hash -863155583, now seen corresponding path program 25 times [2022-11-25 23:54:16,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:54:16,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291078750] [2022-11-25 23:54:16,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:54:16,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:54:16,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:54:16,600 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-25 23:54:16,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:54:16,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291078750] [2022-11-25 23:54:16,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291078750] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:54:16,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975438693] [2022-11-25 23:54:16,601 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:54:16,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:54:16,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:54:16,602 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:54:16,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-25 23:54:16,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:54:16,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 571 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:54:16,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:54:17,299 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-25 23:54:17,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:54:17,693 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2022-11-25 23:54:17,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975438693] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:54:17,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6231209] [2022-11-25 23:54:17,697 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:54:17,697 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:54:17,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:54:17,698 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:54:17,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:54:17,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:17,747 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:54:17,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:54:17,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:17,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:54:17,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:17,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:54:17,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:17,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:17,852 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:54:17,853 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 244 treesize of output 232 [2022-11-25 23:54:17,902 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 [2022-11-25 23:54:18,105 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:54:19,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24261#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:54:19,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:54:19,495 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:54:19,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2022-11-25 23:54:19,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731934834] [2022-11-25 23:54:19,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:54:19,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-25 23:54:19,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:54:19,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-25 23:54:19,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2022-11-25 23:54:19,497 INFO L87 Difference]: Start difference. First operand 105 states and 113 transitions. Second operand has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:20,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:54:20,682 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-11-25 23:54:20,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-25 23:54:20,685 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-11-25 23:54:20,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:54:20,686 INFO L225 Difference]: With dead ends: 276 [2022-11-25 23:54:20,686 INFO L226 Difference]: Without dead ends: 106 [2022-11-25 23:54:20,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 250 SyntacticMatches, 44 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1972 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2022-11-25 23:54:20,687 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 30 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:54:20,687 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 17 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:54:20,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-25 23:54:20,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-11-25 23:54:20,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 105 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:20,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 114 transitions. [2022-11-25 23:54:20,841 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 114 transitions. Word has length 104 [2022-11-25 23:54:20,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:54:20,842 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 114 transitions. [2022-11-25 23:54:20,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5) internal successors, (57), 38 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:20,842 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 114 transitions. [2022-11-25 23:54:20,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-11-25 23:54:20,843 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:54:20,843 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:54:20,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-25 23:54:21,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 23:54:21,050 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:54:21,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:54:21,050 INFO L85 PathProgramCache]: Analyzing trace with hash -1935853781, now seen corresponding path program 26 times [2022-11-25 23:54:21,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:54:21,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373000419] [2022-11-25 23:54:21,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:54:21,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:54:21,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:54:21,610 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-25 23:54:21,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:54:21,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373000419] [2022-11-25 23:54:21,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373000419] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:54:21,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282941511] [2022-11-25 23:54:21,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:54:21,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:54:21,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:54:21,612 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:54:21,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-25 23:54:22,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:54:22,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:54:22,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-25 23:54:22,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:54:22,693 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-25 23:54:22,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:54:23,352 INFO L134 CoverageAnalysis]: Checked inductivity of 517 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 396 trivial. 0 not checked. [2022-11-25 23:54:23,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282941511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:54:23,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [369565396] [2022-11-25 23:54:23,353 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:54:23,353 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:54:23,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:54:23,353 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:54:23,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:54:23,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:23,401 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:54:23,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:54:23,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:23,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:54:23,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:23,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:54:23,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:23,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:54:23,504 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:54:23,504 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 244 treesize of output 232 [2022-11-25 23:54:23,554 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 [2022-11-25 23:54:23,745 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:54:27,170 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25722#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:54:27,171 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:54:27,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:54:27,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2022-11-25 23:54:27,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611127604] [2022-11-25 23:54:27,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:54:27,172 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-25 23:54:27,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:54:27,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-25 23:54:27,173 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=3525, Unknown=0, NotChecked=0, Total=4032 [2022-11-25 23:54:27,173 INFO L87 Difference]: Start difference. First operand 106 states and 114 transitions. Second operand has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:28,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:54:28,396 INFO L93 Difference]: Finished difference Result 194 states and 215 transitions. [2022-11-25 23:54:28,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-25 23:54:28,396 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 0 states have call successors, (0), 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 105 [2022-11-25 23:54:28,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:54:28,397 INFO L225 Difference]: With dead ends: 194 [2022-11-25 23:54:28,397 INFO L226 Difference]: Without dead ends: 113 [2022-11-25 23:54:28,398 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 363 GetRequests, 220 SyntacticMatches, 68 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5009 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=886, Invalid=4966, Unknown=0, NotChecked=0, Total=5852 [2022-11-25 23:54:28,398 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 317 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 898 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:54:28,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 23 Invalid, 898 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:54:28,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-25 23:54:28,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-11-25 23:54:28,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 112 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:28,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2022-11-25 23:54:28,570 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 105 [2022-11-25 23:54:28,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:54:28,570 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2022-11-25 23:54:28,571 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.5254237288135593) internal successors, (90), 59 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:54:28,571 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2022-11-25 23:54:28,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-25 23:54:28,572 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:54:28,572 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:54:28,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-25 23:54:28,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:54:28,781 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:54:28,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:54:28,781 INFO L85 PathProgramCache]: Analyzing trace with hash -676144670, now seen corresponding path program 27 times [2022-11-25 23:54:28,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:54:28,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110286066] [2022-11-25 23:54:28,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:54:28,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:54:29,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:55:08,191 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 93 proven. 501 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:55:08,191 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:55:08,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110286066] [2022-11-25 23:55:08,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110286066] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:55:08,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315020671] [2022-11-25 23:55:08,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:55:08,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:55:08,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:55:08,193 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:55:08,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-25 23:55:08,425 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:55:08,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:55:08,434 WARN L261 TraceCheckSpWp]: Trace formula consists of 615 conjuncts, 386 conjunts are in the unsatisfiable core [2022-11-25 23:55:08,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:55:09,500 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 15 treesize of output 11 [2022-11-25 23:55:20,911 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:55:20,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:55:28,836 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-25 23:55:28,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315020671] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:55:28,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052903197] [2022-11-25 23:55:28,838 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:55:28,838 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:55:28,838 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:55:28,838 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:55:28,839 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:55:28,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:55:28,883 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:55:28,884 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:55:28,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:55:28,927 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:55:28,927 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:55:28,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:55:28,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:55:28,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:55:29,000 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:55:29,028 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:55:29,029 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 234 treesize of output 233 [2022-11-25 23:55:29,109 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 [2022-11-25 23:55:29,368 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:55:40,099 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27160#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:55:40,099 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:55:40,099 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:55:40,099 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 39, 27] total 128 [2022-11-25 23:55:40,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609886897] [2022-11-25 23:55:40,099 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:55:40,100 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2022-11-25 23:55:40,100 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:55:40,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2022-11-25 23:55:40,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=16851, Unknown=0, NotChecked=0, Total=17556 [2022-11-25 23:55:40,102 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:12,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:56:12,345 INFO L93 Difference]: Finished difference Result 224 states and 252 transitions. [2022-11-25 23:56:12,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-25 23:56:12,346 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2022-11-25 23:56:12,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:56:12,347 INFO L225 Difference]: With dead ends: 224 [2022-11-25 23:56:12,348 INFO L226 Difference]: Without dead ends: 221 [2022-11-25 23:56:12,350 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 505 GetRequests, 182 SyntacticMatches, 132 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20658 ImplicationChecksByTransitivity, 59.9s TimeCoverageRelationStatistics Valid=2306, Invalid=34750, Unknown=0, NotChecked=0, Total=37056 [2022-11-25 23:56:12,351 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 87 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 8076 mSolverCounterSat, 1556 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 9632 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1556 IncrementalHoareTripleChecker+Valid, 8076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:56:12,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 105 Invalid, 9632 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1556 Valid, 8076 Invalid, 0 Unknown, 0 Unchecked, 11.8s Time] [2022-11-25 23:56:12,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-11-25 23:56:12,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 114. [2022-11-25 23:56:12,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 1.079646017699115) internal successors, (122), 113 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:12,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 122 transitions. [2022-11-25 23:56:12,653 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 122 transitions. Word has length 112 [2022-11-25 23:56:12,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:56:12,653 INFO L495 AbstractCegarLoop]: Abstraction has 114 states and 122 transitions. [2022-11-25 23:56:12,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 2.2265625) internal successors, (285), 128 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:12,654 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 122 transitions. [2022-11-25 23:56:12,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-11-25 23:56:12,655 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:56:12,655 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:56:12,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-25 23:56:12,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-25 23:56:12,863 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:56:12,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:56:12,863 INFO L85 PathProgramCache]: Analyzing trace with hash 513619502, now seen corresponding path program 28 times [2022-11-25 23:56:12,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:56:12,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60388473] [2022-11-25 23:56:12,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:56:12,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:56:12,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:56:13,471 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-25 23:56:13,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:56:13,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60388473] [2022-11-25 23:56:13,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60388473] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:56:13,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1113404812] [2022-11-25 23:56:13,471 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:56:13,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:56:13,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:56:13,472 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:56:13,475 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-25 23:56:13,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:56:13,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:56:13,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:56:14,203 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-25 23:56:14,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:56:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 606 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2022-11-25 23:56:14,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1113404812] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:56:14,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832694367] [2022-11-25 23:56:14,621 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:56:14,621 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:56:14,621 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:56:14,621 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:56:14,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:56:14,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:14,673 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:56:14,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:56:14,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:14,718 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:56:14,718 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:56:14,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:14,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:56:14,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:14,790 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:56:14,817 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:56:14,817 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 234 treesize of output 233 [2022-11-25 23:56:14,893 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 [2022-11-25 23:56:15,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:56:17,736 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28658#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:56:17,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:56:17,736 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:56:17,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-25 23:56:17,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075604203] [2022-11-25 23:56:17,736 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:56:17,737 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 23:56:17,737 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:56:17,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 23:56:17,738 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1651, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:56:17,738 INFO L87 Difference]: Start difference. First operand 114 states and 122 transitions. Second operand has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:19,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:56:19,334 INFO L93 Difference]: Finished difference Result 300 states and 323 transitions. [2022-11-25 23:56:19,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:56:19,334 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 113 [2022-11-25 23:56:19,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:56:19,335 INFO L225 Difference]: With dead ends: 300 [2022-11-25 23:56:19,335 INFO L226 Difference]: Without dead ends: 115 [2022-11-25 23:56:19,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 235 SyntacticMatches, 85 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3750 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2022-11-25 23:56:19,337 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 26 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1377 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 1377 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-25 23:56:19,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 29 Invalid, 1532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 1377 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-25 23:56:19,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-25 23:56:19,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-11-25 23:56:19,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0789473684210527) internal successors, (123), 114 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) [2022-11-25 23:56:19,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 123 transitions. [2022-11-25 23:56:19,513 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 123 transitions. Word has length 113 [2022-11-25 23:56:19,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:56:19,513 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 123 transitions. [2022-11-25 23:56:19,513 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4634146341463414) internal successors, (60), 41 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:19,513 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 123 transitions. [2022-11-25 23:56:19,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-25 23:56:19,514 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:56:19,514 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:56:19,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-25 23:56:19,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:56:19,714 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:56:19,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:56:19,715 INFO L85 PathProgramCache]: Analyzing trace with hash -327423804, now seen corresponding path program 29 times [2022-11-25 23:56:19,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:56:19,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913584295] [2022-11-25 23:56:19,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:56:19,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:56:19,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:56:20,303 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-25 23:56:20,303 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:56:20,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913584295] [2022-11-25 23:56:20,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913584295] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:56:20,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4058038] [2022-11-25 23:56:20,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:56:20,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:56:20,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:56:20,305 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:56:20,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-25 23:56:20,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-25 23:56:20,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:56:20,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-25 23:56:20,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:56:20,978 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-25 23:56:20,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:56:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2022-11-25 23:56:21,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4058038] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:56:21,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020723417] [2022-11-25 23:56:21,310 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:56:21,311 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:56:21,311 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:56:21,311 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:56:21,311 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:56:21,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:21,358 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:56:21,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:56:21,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:21,399 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:56:21,399 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:56:21,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:21,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:56:21,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:21,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:56:21,490 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:56:21,490 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 244 treesize of output 232 [2022-11-25 23:56:21,538 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 [2022-11-25 23:56:21,715 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:56:24,145 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30223#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:56:24,145 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:56:24,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:56:24,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2022-11-25 23:56:24,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554796838] [2022-11-25 23:56:24,146 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:56:24,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-25 23:56:24,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:56:24,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-25 23:56:24,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=413, Invalid=1657, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:56:24,147 INFO L87 Difference]: Start difference. First operand 115 states and 123 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:25,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:56:25,097 INFO L93 Difference]: Finished difference Result 210 states and 231 transitions. [2022-11-25 23:56:25,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-25 23:56:25,097 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2022-11-25 23:56:25,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:56:25,098 INFO L225 Difference]: With dead ends: 210 [2022-11-25 23:56:25,098 INFO L226 Difference]: Without dead ends: 122 [2022-11-25 23:56:25,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 380 GetRequests, 226 SyntacticMatches, 97 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5155 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=843, Invalid=2579, Unknown=0, NotChecked=0, Total=3422 [2022-11-25 23:56:25,100 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 392 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 340 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 392 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-25 23:56:25,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [392 Valid, 19 Invalid, 588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 340 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-25 23:56:25,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-25 23:56:25,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-11-25 23:56:25,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0743801652892562) internal successors, (130), 121 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:25,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 130 transitions. [2022-11-25 23:56:25,464 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 130 transitions. Word has length 114 [2022-11-25 23:56:25,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:56:25,465 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 130 transitions. [2022-11-25 23:56:25,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 41 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:56:25,465 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 130 transitions. [2022-11-25 23:56:25,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2022-11-25 23:56:25,466 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:56:25,466 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:56:25,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-25 23:56:25,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:56:25,674 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:56:25,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:56:25,675 INFO L85 PathProgramCache]: Analyzing trace with hash -259351537, now seen corresponding path program 30 times [2022-11-25 23:56:25,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:56:25,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073979218] [2022-11-25 23:56:25,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:56:25,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:56:26,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:57:12,169 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 90 proven. 612 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:12,169 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:57:12,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073979218] [2022-11-25 23:57:12,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073979218] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:57:12,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73093155] [2022-11-25 23:57:12,169 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:57:12,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:57:12,170 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:57:12,171 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:57:12,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-25 23:57:12,429 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:57:12,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:57:12,439 WARN L261 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 422 conjunts are in the unsatisfiable core [2022-11-25 23:57:12,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:57:12,725 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 13 treesize of output 9 [2022-11-25 23:57:25,565 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:57:25,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:57:34,022 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 624 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-25 23:57:34,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73093155] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:57:34,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [345629089] [2022-11-25 23:57:34,024 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:57:34,024 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:57:34,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:57:34,024 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:57:34,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:57:34,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:34,063 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:57:34,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:57:34,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:34,101 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:57:34,101 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:57:34,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:34,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:57:34,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:34,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:57:34,180 INFO L321 Elim1Store]: treesize reduction 49, result has 12.5 percent of original size [2022-11-25 23:57:34,181 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 244 treesize of output 232 [2022-11-25 23:57:34,223 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 [2022-11-25 23:57:34,399 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:57:45,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31757#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:57:45,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:57:45,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:57:45,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 42, 29] total 132 [2022-11-25 23:57:45,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026471437] [2022-11-25 23:57:45,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:57:45,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2022-11-25 23:57:45,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:57:45,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2022-11-25 23:57:45,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=850, Invalid=17782, Unknown=0, NotChecked=0, Total=18632 [2022-11-25 23:57:45,182 INFO L87 Difference]: Start difference. First operand 122 states and 130 transitions. Second operand has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:14,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:14,472 INFO L93 Difference]: Finished difference Result 240 states and 268 transitions. [2022-11-25 23:58:14,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-11-25 23:58:14,472 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 0 states have call successors, (0), 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 [2022-11-25 23:58:14,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:14,474 INFO L225 Difference]: With dead ends: 240 [2022-11-25 23:58:14,474 INFO L226 Difference]: Without dead ends: 237 [2022-11-25 23:58:14,477 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 193 SyntacticMatches, 153 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22352 ImplicationChecksByTransitivity, 59.4s TimeCoverageRelationStatistics Valid=2434, Invalid=35008, Unknown=0, NotChecked=0, Total=37442 [2022-11-25 23:58:14,478 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 62 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 8820 mSolverCounterSat, 1460 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 10280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1460 IncrementalHoareTripleChecker+Valid, 8820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:14,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 103 Invalid, 10280 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1460 Valid, 8820 Invalid, 0 Unknown, 0 Unchecked, 12.2s Time] [2022-11-25 23:58:14,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-11-25 23:58:14,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 123. [2022-11-25 23:58:14,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 122 states have (on average 1.0737704918032787) internal successors, (131), 122 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:14,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 131 transitions. [2022-11-25 23:58:14,701 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 131 transitions. Word has length 121 [2022-11-25 23:58:14,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:14,701 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 131 transitions. [2022-11-25 23:58:14,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 2.287878787878788) internal successors, (302), 132 states have internal predecessors, (302), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:14,702 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 131 transitions. [2022-11-25 23:58:14,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-25 23:58:14,702 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:14,702 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:58:14,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:14,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:14,903 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:14,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:14,903 INFO L85 PathProgramCache]: Analyzing trace with hash 549304737, now seen corresponding path program 31 times [2022-11-25 23:58:14,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:14,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311092977] [2022-11-25 23:58:14,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:14,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:14,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:15,552 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 79 proven. 90 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-25 23:58:15,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:15,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311092977] [2022-11-25 23:58:15,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311092977] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:15,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657065554] [2022-11-25 23:58:15,552 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-25 23:58:15,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:15,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:15,554 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:15,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-25 23:58:15,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:15,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:58:15,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:16,268 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-25 23:58:16,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:16,712 INFO L134 CoverageAnalysis]: Checked inductivity of 715 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-11-25 23:58:16,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657065554] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:16,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [336232183] [2022-11-25 23:58:16,713 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:58:16,713 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:16,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:16,714 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:16,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:16,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:16,750 INFO L321 Elim1Store]: treesize reduction 28, result has 40.4 percent of original size [2022-11-25 23:58:16,750 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 26 treesize of output 42 [2022-11-25 23:58:16,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:16,786 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:58:16,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:58:16,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:16,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:58:16,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:16,857 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:16,880 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:58:16,880 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 234 treesize of output 233 [2022-11-25 23:58:16,950 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 [2022-11-25 23:58:17,112 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:18,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33356#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (<= |#NULL.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:18,709 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:18,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:18,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2022-11-25 23:58:18,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985425612] [2022-11-25 23:58:18,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:18,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-25 23:58:18,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:18,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-25 23:58:18,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=1874, Unknown=0, NotChecked=0, Total=2352 [2022-11-25 23:58:18,711 INFO L87 Difference]: Start difference. First operand 123 states and 131 transitions. Second operand has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:20,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:20,106 INFO L93 Difference]: Finished difference Result 324 states and 347 transitions. [2022-11-25 23:58:20,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-25 23:58:20,106 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2022-11-25 23:58:20,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:20,107 INFO L225 Difference]: With dead ends: 324 [2022-11-25 23:58:20,107 INFO L226 Difference]: Without dead ends: 124 [2022-11-25 23:58:20,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 406 GetRequests, 293 SyntacticMatches, 53 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=779, Invalid=3003, Unknown=0, NotChecked=0, Total=3782 [2022-11-25 23:58:20,109 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 982 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 1154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 982 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:20,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 21 Invalid, 1154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 982 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:58:20,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-11-25 23:58:20,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-11-25 23:58:20,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 123 states have (on average 1.0731707317073171) internal successors, (132), 123 states have internal predecessors, (132), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:20,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions. [2022-11-25 23:58:20,301 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 122 [2022-11-25 23:58:20,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:20,301 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 132 transitions. [2022-11-25 23:58:20,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.4318181818181819) internal successors, (63), 44 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:20,301 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions. [2022-11-25 23:58:20,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-11-25 23:58:20,302 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:20,302 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:58:20,309 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:20,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:20,509 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:20,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:20,509 INFO L85 PathProgramCache]: Analyzing trace with hash 1078955979, now seen corresponding path program 32 times [2022-11-25 23:58:20,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:20,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587130395] [2022-11-25 23:58:20,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:20,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:20,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:58:21,100 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 66 proven. 103 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-25 23:58:21,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:58:21,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587130395] [2022-11-25 23:58:21,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1587130395] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:58:21,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586627154] [2022-11-25 23:58:21,100 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:58:21,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:58:21,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:58:21,101 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:58:21,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-25 23:58:21,565 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-25 23:58:21,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:58:21,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 678 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-25 23:58:21,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:58:22,396 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-25 23:58:22,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:58:23,167 INFO L134 CoverageAnalysis]: Checked inductivity of 728 backedges. 91 proven. 78 refuted. 0 times theorem prover too weak. 559 trivial. 0 not checked. [2022-11-25 23:58:23,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586627154] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:58:23,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2011408446] [2022-11-25 23:58:23,168 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-25 23:58:23,168 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:58:23,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:58:23,169 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:58:23,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:58:23,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,209 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:58:23,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2022-11-25 23:58:23,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2022-11-25 23:58:23,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2022-11-25 23:58:23,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:58:23,281 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:58:23,304 INFO L321 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2022-11-25 23:58:23,304 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 234 treesize of output 233 [2022-11-25 23:58:23,377 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 [2022-11-25 23:58:23,529 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:58:27,955 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35071#(and (<= ~SIZE~0 32767) (not (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0)) (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 1 |ULTIMATE.start_main_~i~1#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) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~sum~0#1| 0) 1 0)) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-25 23:58:27,955 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:58:27,955 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:58:27,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2022-11-25 23:58:27,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440118204] [2022-11-25 23:58:27,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:58:27,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-25 23:58:27,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:58:27,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-25 23:58:27,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=673, Invalid=4729, Unknown=0, NotChecked=0, Total=5402 [2022-11-25 23:58:27,957 INFO L87 Difference]: Start difference. First operand 124 states and 132 transitions. Second operand has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:29,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:58:29,284 INFO L93 Difference]: Finished difference Result 226 states and 247 transitions. [2022-11-25 23:58:29,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-25 23:58:29,284 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2022-11-25 23:58:29,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:58:29,284 INFO L225 Difference]: With dead ends: 226 [2022-11-25 23:58:29,284 INFO L226 Difference]: Without dead ends: 131 [2022-11-25 23:58:29,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 245 SyntacticMatches, 93 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7769 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=1185, Invalid=6647, Unknown=0, NotChecked=0, Total=7832 [2022-11-25 23:58:29,285 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 870 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 870 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:58:29,285 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [870 Valid, 23 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:58:29,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-11-25 23:58:29,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-11-25 23:58:29,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0692307692307692) internal successors, (139), 130 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:29,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 139 transitions. [2022-11-25 23:58:29,496 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 139 transitions. Word has length 123 [2022-11-25 23:58:29,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:58:29,496 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 139 transitions. [2022-11-25 23:58:29,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.4492753623188406) internal successors, (100), 69 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:58:29,496 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 139 transitions. [2022-11-25 23:58:29,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-25 23:58:29,497 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:58:29,497 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:58:29,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-25 23:58:29,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-25 23:58:29,697 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-25 23:58:29,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:58:29,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1637580674, now seen corresponding path program 33 times [2022-11-25 23:58:29,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:58:29,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556336773] [2022-11-25 23:58:29,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:58:29,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:58:30,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:59:17,721 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 120 proven. 699 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:17,721 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:59:17,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556336773] [2022-11-25 23:59:17,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556336773] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:59:17,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946148322] [2022-11-25 23:59:17,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:59:17,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:59:17,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:59:17,723 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:59:17,726 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ffdf5c8e-f536-4987-9a4d-cbafb91e9b87/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-25 23:59:17,997 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:59:17,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:59:18,007 WARN L261 TraceCheckSpWp]: Trace formula consists of 713 conjuncts, 454 conjunts are in the unsatisfiable core [2022-11-25 23:59:18,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:59:18,819 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 15 treesize of output 11 [2022-11-25 23:59:32,511 INFO L134 CoverageAnalysis]: Checked inductivity of 819 backedges. 0 proven. 819 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:59:32,512 INFO L328 TraceCheckSpWp]: Computing backward predicates...