./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/seq-3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version b5237d83 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_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/seq-3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba --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 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 --- 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-b5237d8 [2022-11-22 01:55:06,072 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-22 01:55:06,074 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-22 01:55:06,115 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-22 01:55:06,120 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-22 01:55:06,125 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-22 01:55:06,127 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-22 01:55:06,129 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-22 01:55:06,131 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-22 01:55:06,132 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-22 01:55:06,133 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-22 01:55:06,134 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-22 01:55:06,134 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-22 01:55:06,135 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-22 01:55:06,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-22 01:55:06,138 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-22 01:55:06,138 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-22 01:55:06,139 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-22 01:55:06,141 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-22 01:55:06,143 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-22 01:55:06,144 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-22 01:55:06,146 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-22 01:55:06,147 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-22 01:55:06,148 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-22 01:55:06,152 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-22 01:55:06,152 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-22 01:55:06,152 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-22 01:55:06,153 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-22 01:55:06,154 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-22 01:55:06,155 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-22 01:55:06,155 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-22 01:55:06,156 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-22 01:55:06,157 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-22 01:55:06,158 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-22 01:55:06,159 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-22 01:55:06,159 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-22 01:55:06,160 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-22 01:55:06,160 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-22 01:55:06,160 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-22 01:55:06,161 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-22 01:55:06,162 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-22 01:55:06,169 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-22 01:55:06,207 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-22 01:55:06,208 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-22 01:55:06,209 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-22 01:55:06,209 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-22 01:55:06,210 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-22 01:55:06,210 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-22 01:55:06,210 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-22 01:55:06,210 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-22 01:55:06,211 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-22 01:55:06,211 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-22 01:55:06,212 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-22 01:55:06,212 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-22 01:55:06,212 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-22 01:55:06,212 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-22 01:55:06,213 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-22 01:55:06,213 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-22 01:55:06,213 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-22 01:55:06,213 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-22 01:55:06,214 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-22 01:55:06,214 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-22 01:55:06,214 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-22 01:55:06,215 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-22 01:55:06,215 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-22 01:55:06,215 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-22 01:55:06,215 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-22 01:55:06,216 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-22 01:55:06,216 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-22 01:55:06,216 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-22 01:55:06,216 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-22 01:55:06,217 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-22 01:55:06,217 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-22 01:55:06,217 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-22 01:55:06,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:55:06,218 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-22 01:55:06,218 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-22 01:55:06,218 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-22 01:55:06,218 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-22 01:55:06,218 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-22 01:55:06,219 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-22 01:55:06,219 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-22 01:55:06,219 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-22 01:55:06,219 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_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6c770a3141edeab927df0da4e8c2152e1fb2e87b0c43a352500a7e3d3cff4533 [2022-11-22 01:55:06,527 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-22 01:55:06,561 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-22 01:55:06,564 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-22 01:55:06,566 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-22 01:55:06,566 INFO L275 PluginConnector]: CDTParser initialized [2022-11-22 01:55:06,567 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/../../sv-benchmarks/c/loop-invgen/seq-3.i [2022-11-22 01:55:09,700 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-22 01:55:09,948 INFO L351 CDTParser]: Found 1 translation units. [2022-11-22 01:55:09,949 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/sv-benchmarks/c/loop-invgen/seq-3.i [2022-11-22 01:55:09,955 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/data/1cde7d915/7186ba50229449f899f3a4827d524cca/FLAG56dcb2ddc [2022-11-22 01:55:09,975 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/data/1cde7d915/7186ba50229449f899f3a4827d524cca [2022-11-22 01:55:09,987 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-22 01:55:09,988 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-22 01:55:09,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-22 01:55:09,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-22 01:55:09,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-22 01:55:09,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:55:09" (1/1) ... [2022-11-22 01:55:09,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50337e73 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:09, skipping insertion in model container [2022-11-22 01:55:09,995 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:55:09" (1/1) ... [2022-11-22 01:55:10,003 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-22 01:55:10,017 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-22 01:55:10,136 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_12f08967-2884-402d-b224-a0c78aa0f17d/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2022-11-22 01:55:10,148 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:55:10,157 INFO L203 MainTranslator]: Completed pre-run [2022-11-22 01:55:10,167 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_12f08967-2884-402d-b224-a0c78aa0f17d/sv-benchmarks/c/loop-invgen/seq-3.i[893,906] [2022-11-22 01:55:10,171 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-22 01:55:10,182 INFO L208 MainTranslator]: Completed translation [2022-11-22 01:55:10,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10 WrapperNode [2022-11-22 01:55:10,183 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-22 01:55:10,183 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-22 01:55:10,184 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-22 01:55:10,184 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-22 01:55:10,191 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,196 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,214 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2022-11-22 01:55:10,214 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-22 01:55:10,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-22 01:55:10,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-22 01:55:10,215 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-22 01:55:10,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,224 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,225 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,226 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,228 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,235 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,244 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,249 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,251 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-22 01:55:10,252 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-22 01:55:10,252 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-22 01:55:10,252 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-22 01:55:10,253 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (1/1) ... [2022-11-22 01:55:10,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-22 01:55:10,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:10,284 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-22 01:55:10,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-22 01:55:10,318 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-22 01:55:10,318 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-22 01:55:10,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-22 01:55:10,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-22 01:55:10,376 INFO L235 CfgBuilder]: Building ICFG [2022-11-22 01:55:10,378 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-22 01:55:10,497 INFO L276 CfgBuilder]: Performing block encoding [2022-11-22 01:55:10,534 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-22 01:55:10,535 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-22 01:55:10,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:55:10 BoogieIcfgContainer [2022-11-22 01:55:10,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-22 01:55:10,541 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-22 01:55:10,541 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-22 01:55:10,565 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-22 01:55:10,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:55:09" (1/3) ... [2022-11-22 01:55:10,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3804921d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:55:10, skipping insertion in model container [2022-11-22 01:55:10,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:55:10" (2/3) ... [2022-11-22 01:55:10,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3804921d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:55:10, skipping insertion in model container [2022-11-22 01:55:10,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:55:10" (3/3) ... [2022-11-22 01:55:10,568 INFO L112 eAbstractionObserver]: Analyzing ICFG seq-3.i [2022-11-22 01:55:10,598 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-22 01:55:10,599 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-22 01:55:10,666 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-22 01:55:10,673 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;@54eb3281, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-22 01:55:10,673 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-22 01:55:10,678 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:10,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-22 01:55:10,684 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:10,685 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:10,686 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:10,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:10,692 INFO L85 PathProgramCache]: Analyzing trace with hash 388343819, now seen corresponding path program 1 times [2022-11-22 01:55:10,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:10,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529141802] [2022-11-22 01:55:10,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:10,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:10,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:11,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:11,010 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:11,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529141802] [2022-11-22 01:55:11,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529141802] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:55:11,011 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:55:11,012 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 01:55:11,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887374461] [2022-11-22 01:55:11,014 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:55:11,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:55:11,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:11,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:55:11,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:55:11,051 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.7) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:11,152 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2022-11-22 01:55:11,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-22 01:55:11,155 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-22 01:55:11,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:11,164 INFO L225 Difference]: With dead ends: 32 [2022-11-22 01:55:11,164 INFO L226 Difference]: Without dead ends: 18 [2022-11-22 01:55:11,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-11-22 01:55:11,171 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:11,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 24 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-22 01:55:11,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-11-22 01:55:11,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2022-11-22 01:55:11,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2022-11-22 01:55:11,207 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2022-11-22 01:55:11,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:11,207 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2022-11-22 01:55:11,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,208 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2022-11-22 01:55:11,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-22 01:55:11,208 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:11,209 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:11,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-22 01:55:11,209 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:11,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:11,210 INFO L85 PathProgramCache]: Analyzing trace with hash -877914225, now seen corresponding path program 1 times [2022-11-22 01:55:11,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:11,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858741226] [2022-11-22 01:55:11,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:11,211 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:11,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:11,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:11,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:11,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858741226] [2022-11-22 01:55:11,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858741226] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-22 01:55:11,389 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-22 01:55:11,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-22 01:55:11,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134987488] [2022-11-22 01:55:11,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-22 01:55:11,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-22 01:55:11,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:11,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-22 01:55:11,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-22 01:55:11,393 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:11,482 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2022-11-22 01:55:11,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 01:55:11,483 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-22 01:55:11,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:11,484 INFO L225 Difference]: With dead ends: 22 [2022-11-22 01:55:11,484 INFO L226 Difference]: Without dead ends: 20 [2022-11-22 01:55:11,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-11-22 01:55:11,486 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 12 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:11,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 15 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:11,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-11-22 01:55:11,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 14. [2022-11-22 01:55:11,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2022-11-22 01:55:11,492 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2022-11-22 01:55:11,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:11,493 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2022-11-22 01:55:11,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:11,493 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2022-11-22 01:55:11,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-22 01:55:11,494 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:11,494 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:11,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-22 01:55:11,495 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:11,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:11,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1881968511, now seen corresponding path program 1 times [2022-11-22 01:55:11,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:11,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131292562] [2022-11-22 01:55:11,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:11,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:11,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:11,734 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:11,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:11,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131292562] [2022-11-22 01:55:11,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131292562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:11,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103664651] [2022-11-22 01:55:11,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:11,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:11,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:11,745 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:11,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-22 01:55:11,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:11,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 01:55:11,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:12,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:12,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:12,149 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:12,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103664651] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:12,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [331451311] [2022-11-22 01:55:12,185 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:12,186 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:12,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:12,197 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:12,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:12,564 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:13,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '232#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:13,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:13,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:13,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 13 [2022-11-22 01:55:13,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105273137] [2022-11-22 01:55:13,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:13,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 01:55:13,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:13,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 01:55:13,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2022-11-22 01:55:13,118 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:13,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:13,305 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2022-11-22 01:55:13,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-22 01:55:13,306 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-11-22 01:55:13,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:13,308 INFO L225 Difference]: With dead ends: 32 [2022-11-22 01:55:13,308 INFO L226 Difference]: Without dead ends: 23 [2022-11-22 01:55:13,310 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:55:13,313 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 22 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 84 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:13,314 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 59 Invalid, 84 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:13,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-11-22 01:55:13,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2022-11-22 01:55:13,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:13,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2022-11-22 01:55:13,323 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 12 [2022-11-22 01:55:13,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:13,324 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2022-11-22 01:55:13,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:13,324 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2022-11-22 01:55:13,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-22 01:55:13,325 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:13,325 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:13,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:13,536 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:13,537 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:13,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:13,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1334724370, now seen corresponding path program 1 times [2022-11-22 01:55:13,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:13,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [16217871] [2022-11-22 01:55:13,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:13,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:13,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:13,646 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:13,646 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:13,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [16217871] [2022-11-22 01:55:13,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [16217871] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:13,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359106931] [2022-11-22 01:55:13,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:13,647 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:13,647 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:13,657 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:13,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-22 01:55:13,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:13,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-22 01:55:13,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:13,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:13,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:13,901 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:13,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359106931] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:13,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027407473] [2022-11-22 01:55:13,904 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:13,904 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:13,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:13,905 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:13,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:14,067 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:14,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '399#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:14,518 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:14,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:14,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-11-22 01:55:14,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070477719] [2022-11-22 01:55:14,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:14,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 01:55:14,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:14,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 01:55:14,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2022-11-22 01:55:14,520 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2022-11-22 01:55:14,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:14,649 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2022-11-22 01:55:14,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-22 01:55:14,649 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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 12 [2022-11-22 01:55:14,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:14,650 INFO L225 Difference]: With dead ends: 42 [2022-11-22 01:55:14,650 INFO L226 Difference]: Without dead ends: 33 [2022-11-22 01:55:14,651 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:55:14,652 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 28 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:14,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 40 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:14,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-22 01:55:14,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2022-11-22 01:55:14,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:14,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2022-11-22 01:55:14,657 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 12 [2022-11-22 01:55:14,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:14,657 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2022-11-22 01:55:14,658 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 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) [2022-11-22 01:55:14,658 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2022-11-22 01:55:14,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-22 01:55:14,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:14,658 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:14,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:14,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:14,864 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:14,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:14,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1261535739, now seen corresponding path program 2 times [2022-11-22 01:55:14,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:14,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913914233] [2022-11-22 01:55:14,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:14,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:14,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:15,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:15,005 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:15,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913914233] [2022-11-22 01:55:15,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913914233] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:15,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538588631] [2022-11-22 01:55:15,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:15,006 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:15,006 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:15,007 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:15,010 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-22 01:55:15,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-22 01:55:15,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:15,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 01:55:15,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:15,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:15,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:15,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538588631] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:15,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [351074983] [2022-11-22 01:55:15,132 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:15,132 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:15,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:15,133 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:15,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:15,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:15,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '584#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:15,647 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:15,647 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:15,647 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-11-22 01:55:15,647 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94040928] [2022-11-22 01:55:15,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:15,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-22 01:55:15,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:15,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-22 01:55:15,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2022-11-22 01:55:15,649 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:15,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:15,754 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2022-11-22 01:55:15,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-22 01:55:15,755 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-22 01:55:15,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:15,756 INFO L225 Difference]: With dead ends: 27 [2022-11-22 01:55:15,756 INFO L226 Difference]: Without dead ends: 25 [2022-11-22 01:55:15,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2022-11-22 01:55:15,757 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 22 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:15,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 22 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:15,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-22 01:55:15,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2022-11-22 01:55:15,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 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) [2022-11-22 01:55:15,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2022-11-22 01:55:15,763 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 13 [2022-11-22 01:55:15,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:15,763 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2022-11-22 01:55:15,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:15,763 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2022-11-22 01:55:15,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 01:55:15,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:15,764 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:15,774 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:15,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:15,965 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:15,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:15,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1442517429, now seen corresponding path program 3 times [2022-11-22 01:55:15,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:15,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034720662] [2022-11-22 01:55:15,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:15,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:15,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:16,121 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:16,121 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:16,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034720662] [2022-11-22 01:55:16,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034720662] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:16,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337858123] [2022-11-22 01:55:16,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:16,122 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:16,122 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:16,127 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:16,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-22 01:55:16,181 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:16,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:16,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 01:55:16,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:16,340 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:16,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:16,430 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:16,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337858123] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:16,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1372178483] [2022-11-22 01:55:16,432 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:16,432 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:16,433 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:16,433 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:16,433 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:16,542 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:16,971 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '779#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:16,971 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:16,971 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:16,971 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2022-11-22 01:55:16,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994840878] [2022-11-22 01:55:16,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:16,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 01:55:16,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:16,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 01:55:16,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2022-11-22 01:55:16,973 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 18 states, 18 states have (on average 2.0) 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) [2022-11-22 01:55:17,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:17,147 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2022-11-22 01:55:17,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-22 01:55:17,147 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) 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 16 [2022-11-22 01:55:17,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:17,148 INFO L225 Difference]: With dead ends: 44 [2022-11-22 01:55:17,148 INFO L226 Difference]: Without dead ends: 32 [2022-11-22 01:55:17,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 25 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2022-11-22 01:55:17,149 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 29 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:17,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 61 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:17,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-22 01:55:17,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 20. [2022-11-22 01:55:17,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:17,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-22 01:55:17,159 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2022-11-22 01:55:17,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:17,159 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-22 01:55:17,160 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0) 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) [2022-11-22 01:55:17,160 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-22 01:55:17,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 01:55:17,160 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:17,160 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:17,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:17,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:17,361 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:17,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:17,361 INFO L85 PathProgramCache]: Analyzing trace with hash -866118564, now seen corresponding path program 1 times [2022-11-22 01:55:17,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:17,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187095699] [2022-11-22 01:55:17,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:17,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:17,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:17,466 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:17,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:17,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187095699] [2022-11-22 01:55:17,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187095699] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:17,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488883264] [2022-11-22 01:55:17,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:17,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:17,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:17,469 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:17,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-22 01:55:17,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:17,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 01:55:17,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:17,658 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:17,658 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:17,738 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:17,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488883264] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:17,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412063871] [2022-11-22 01:55:17,740 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:17,740 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:17,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:17,741 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:17,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:17,862 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:18,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1008#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:18,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:18,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:18,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2022-11-22 01:55:18,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004857221] [2022-11-22 01:55:18,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:18,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 01:55:18,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:18,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 01:55:18,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:55:18,284 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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) [2022-11-22 01:55:18,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:18,476 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2022-11-22 01:55:18,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 01:55:18,477 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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 16 [2022-11-22 01:55:18,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:18,477 INFO L225 Difference]: With dead ends: 56 [2022-11-22 01:55:18,477 INFO L226 Difference]: Without dead ends: 44 [2022-11-22 01:55:18,478 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2022-11-22 01:55:18,478 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 50 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:18,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 76 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:18,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-22 01:55:18,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 20. [2022-11-22 01:55:18,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:18,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2022-11-22 01:55:18,485 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 16 [2022-11-22 01:55:18,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:18,485 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2022-11-22 01:55:18,486 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 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) [2022-11-22 01:55:18,486 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2022-11-22 01:55:18,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-22 01:55:18,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:18,487 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:18,495 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:18,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:18,693 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:18,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:18,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1678809045, now seen corresponding path program 2 times [2022-11-22 01:55:18,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:18,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625595521] [2022-11-22 01:55:18,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:18,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:18,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:18,801 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:18,802 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:18,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625595521] [2022-11-22 01:55:18,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625595521] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:18,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657985363] [2022-11-22 01:55:18,802 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:18,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:18,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:18,817 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:18,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-22 01:55:18,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-22 01:55:18,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:18,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-22 01:55:18,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:18,970 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:18,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:19,046 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:19,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657985363] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:19,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906214886] [2022-11-22 01:55:19,048 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:19,049 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:19,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:19,049 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:19,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:19,162 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:19,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1257#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:19,683 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:19,684 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:19,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2022-11-22 01:55:19,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723016994] [2022-11-22 01:55:19,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:19,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 01:55:19,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:19,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 01:55:19,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-11-22 01:55:19,685 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:19,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:19,844 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2022-11-22 01:55:19,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 01:55:19,844 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-22 01:55:19,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:19,845 INFO L225 Difference]: With dead ends: 69 [2022-11-22 01:55:19,845 INFO L226 Difference]: Without dead ends: 57 [2022-11-22 01:55:19,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2022-11-22 01:55:19,846 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 56 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:19,846 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 41 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:19,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-22 01:55:19,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 21. [2022-11-22 01:55:19,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:19,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-11-22 01:55:19,859 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 16 [2022-11-22 01:55:19,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:19,859 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-11-22 01:55:19,859 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:19,859 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-11-22 01:55:19,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-22 01:55:19,860 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:19,860 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:19,871 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:20,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:20,067 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:20,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:20,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1745511985, now seen corresponding path program 4 times [2022-11-22 01:55:20,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:20,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109134002] [2022-11-22 01:55:20,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:20,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:20,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:20,140 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:20,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:20,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109134002] [2022-11-22 01:55:20,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109134002] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:20,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796376832] [2022-11-22 01:55:20,141 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:20,141 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:20,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:20,142 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:20,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-22 01:55:20,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:20,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:55:20,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:20,232 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:20,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:20,273 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:20,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796376832] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:20,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610840859] [2022-11-22 01:55:20,275 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:20,275 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:20,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:20,276 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:20,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:20,383 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:20,784 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1525#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:20,784 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:20,784 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:20,784 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 7 [2022-11-22 01:55:20,784 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993720451] [2022-11-22 01:55:20,785 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:20,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-22 01:55:20,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:20,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-22 01:55:20,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2022-11-22 01:55:20,786 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:20,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:20,905 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2022-11-22 01:55:20,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-22 01:55:20,905 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-11-22 01:55:20,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:20,906 INFO L225 Difference]: With dead ends: 32 [2022-11-22 01:55:20,906 INFO L226 Difference]: Without dead ends: 30 [2022-11-22 01:55:20,906 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=96, Invalid=324, Unknown=0, NotChecked=0, Total=420 [2022-11-22 01:55:20,907 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 23 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:20,907 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 18 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:20,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-22 01:55:20,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2022-11-22 01:55:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:20,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2022-11-22 01:55:20,915 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 17 [2022-11-22 01:55:20,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:20,916 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2022-11-22 01:55:20,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:20,916 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-11-22 01:55:20,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:55:20,917 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:20,917 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:20,926 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-11-22 01:55:21,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:21,127 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:21,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:21,127 INFO L85 PathProgramCache]: Analyzing trace with hash -1373649343, now seen corresponding path program 5 times [2022-11-22 01:55:21,127 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:21,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962797540] [2022-11-22 01:55:21,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:21,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:21,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:21,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:21,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962797540] [2022-11-22 01:55:21,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962797540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:21,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791947165] [2022-11-22 01:55:21,253 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:21,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:21,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:21,255 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:21,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-22 01:55:21,307 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 01:55:21,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:21,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:55:21,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:21,533 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:21,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:21,648 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:21,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791947165] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:21,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1474014163] [2022-11-22 01:55:21,650 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:21,650 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:21,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:21,651 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:21,651 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:21,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:22,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1768#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:22,231 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:22,231 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:22,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 21 [2022-11-22 01:55:22,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156475724] [2022-11-22 01:55:22,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:22,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 01:55:22,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:22,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 01:55:22,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=734, Unknown=0, NotChecked=0, Total=870 [2022-11-22 01:55:22,234 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:22,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:22,477 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2022-11-22 01:55:22,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-22 01:55:22,478 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-22 01:55:22,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:22,478 INFO L225 Difference]: With dead ends: 56 [2022-11-22 01:55:22,478 INFO L226 Difference]: Without dead ends: 41 [2022-11-22 01:55:22,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 33 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=231, Invalid=1175, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:55:22,480 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 39 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:22,480 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 89 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:22,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-11-22 01:55:22,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 25. [2022-11-22 01:55:22,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:22,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-22 01:55:22,487 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2022-11-22 01:55:22,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:22,487 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-22 01:55:22,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:22,488 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-22 01:55:22,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:55:22,488 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:22,488 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:22,495 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-11-22 01:55:22,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-22 01:55:22,695 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:22,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:22,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1130855378, now seen corresponding path program 2 times [2022-11-22 01:55:22,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:22,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102868686] [2022-11-22 01:55:22,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:22,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:22,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:22,852 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:22,853 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:22,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102868686] [2022-11-22 01:55:22,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102868686] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:22,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36867934] [2022-11-22 01:55:22,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:22,854 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:22,854 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:22,855 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:22,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-22 01:55:22,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-22 01:55:22,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:22,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:55:22,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:23,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:23,220 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:23,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36867934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:23,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411441098] [2022-11-22 01:55:23,222 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:23,222 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:23,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:23,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:23,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:23,383 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:23,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2059#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:23,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:23,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:23,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 20 [2022-11-22 01:55:23,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20679927] [2022-11-22 01:55:23,801 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:23,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 01:55:23,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:23,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 01:55:23,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=698, Unknown=0, NotChecked=0, Total=812 [2022-11-22 01:55:23,802 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:24,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:24,059 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2022-11-22 01:55:24,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 01:55:24,060 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-22 01:55:24,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:24,060 INFO L225 Difference]: With dead ends: 72 [2022-11-22 01:55:24,061 INFO L226 Difference]: Without dead ends: 57 [2022-11-22 01:55:24,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 34 SyntacticMatches, 7 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=224, Invalid=1258, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 01:55:24,062 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 53 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:24,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 87 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:24,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-22 01:55:24,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 25. [2022-11-22 01:55:24,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:24,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-22 01:55:24,070 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2022-11-22 01:55:24,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:24,070 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-22 01:55:24,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:24,071 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-22 01:55:24,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:55:24,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:24,071 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:24,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:24,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:24,277 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:24,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:24,278 INFO L85 PathProgramCache]: Analyzing trace with hash 1350193185, now seen corresponding path program 3 times [2022-11-22 01:55:24,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:24,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390921132] [2022-11-22 01:55:24,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:24,278 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:24,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:24,404 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:24,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:24,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390921132] [2022-11-22 01:55:24,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390921132] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:24,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1983201576] [2022-11-22 01:55:24,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:24,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:24,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:24,405 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:24,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-22 01:55:24,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:24,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:24,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:55:24,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:24,639 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:24,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:24,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1983201576] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:24,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342189740] [2022-11-22 01:55:24,747 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:24,747 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:24,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:24,747 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:24,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:24,885 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:25,270 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2379#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:25,270 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:25,271 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:25,271 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 19 [2022-11-22 01:55:25,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364503901] [2022-11-22 01:55:25,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:25,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 01:55:25,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:25,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 01:55:25,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2022-11-22 01:55:25,273 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:25,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:25,519 INFO L93 Difference]: Finished difference Result 87 states and 96 transitions. [2022-11-22 01:55:25,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 01:55:25,519 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-22 01:55:25,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:25,520 INFO L225 Difference]: With dead ends: 87 [2022-11-22 01:55:25,520 INFO L226 Difference]: Without dead ends: 72 [2022-11-22 01:55:25,521 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 35 SyntacticMatches, 7 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 447 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=215, Invalid=1191, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:55:25,522 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:25,522 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 85 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:25,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-11-22 01:55:25,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 25. [2022-11-22 01:55:25,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.25) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:25,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2022-11-22 01:55:25,531 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 20 [2022-11-22 01:55:25,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:25,531 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2022-11-22 01:55:25,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:25,532 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2022-11-22 01:55:25,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-22 01:55:25,532 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:25,533 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:25,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:25,738 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:25,738 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:25,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:25,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1218721266, now seen corresponding path program 3 times [2022-11-22 01:55:25,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:25,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435563681] [2022-11-22 01:55:25,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:25,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:25,860 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:25,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:25,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435563681] [2022-11-22 01:55:25,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435563681] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:25,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150412640] [2022-11-22 01:55:25,861 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:25,862 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:25,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:25,863 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:25,872 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-22 01:55:25,916 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:25,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:25,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-22 01:55:25,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:26,055 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:26,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:26,150 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:26,151 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150412640] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:26,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573118024] [2022-11-22 01:55:26,154 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:26,154 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:26,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:26,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:26,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:26,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:26,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2722#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:26,696 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:26,696 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:26,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 18 [2022-11-22 01:55:26,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961670074] [2022-11-22 01:55:26,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:26,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 01:55:26,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:26,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 01:55:26,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=597, Unknown=0, NotChecked=0, Total=702 [2022-11-22 01:55:26,698 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:26,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:26,912 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2022-11-22 01:55:26,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 01:55:26,912 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-22 01:55:26,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:26,913 INFO L225 Difference]: With dead ends: 103 [2022-11-22 01:55:26,913 INFO L226 Difference]: Without dead ends: 88 [2022-11-22 01:55:26,914 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 36 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=194, Invalid=996, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 01:55:26,915 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 85 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:26,915 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 61 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:26,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-22 01:55:26,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 26. [2022-11-22 01:55:26,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 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) [2022-11-22 01:55:26,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-11-22 01:55:26,924 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 20 [2022-11-22 01:55:26,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:26,925 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-11-22 01:55:26,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:26,925 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-11-22 01:55:26,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-22 01:55:26,926 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:26,926 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:26,932 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:27,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-22 01:55:27,131 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:27,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:27,131 INFO L85 PathProgramCache]: Analyzing trace with hash -1794699323, now seen corresponding path program 6 times [2022-11-22 01:55:27,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:27,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112337065] [2022-11-22 01:55:27,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:27,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:27,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:27,249 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:27,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:27,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112337065] [2022-11-22 01:55:27,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112337065] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:27,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726986930] [2022-11-22 01:55:27,250 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:27,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:27,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:27,251 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:27,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-22 01:55:27,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:27,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:27,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:27,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:27,341 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:27,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:27,400 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:27,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726986930] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:27,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [614084057] [2022-11-22 01:55:27,404 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:27,405 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:27,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:27,405 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:27,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:27,514 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:27,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3085#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:27,877 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:27,877 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:27,877 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 8 [2022-11-22 01:55:27,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203372700] [2022-11-22 01:55:27,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:27,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-22 01:55:27,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:27,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-22 01:55:27,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-11-22 01:55:27,879 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 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) [2022-11-22 01:55:28,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:28,007 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-11-22 01:55:28,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-22 01:55:28,007 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 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) Word has length 21 [2022-11-22 01:55:28,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:28,008 INFO L225 Difference]: With dead ends: 37 [2022-11-22 01:55:28,008 INFO L226 Difference]: Without dead ends: 35 [2022-11-22 01:55:28,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 48 SyntacticMatches, 8 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2022-11-22 01:55:28,009 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 35 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:28,009 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 22 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:28,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-11-22 01:55:28,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 29. [2022-11-22 01:55:28,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:28,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-11-22 01:55:28,020 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 21 [2022-11-22 01:55:28,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:28,021 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-11-22 01:55:28,021 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 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) [2022-11-22 01:55:28,021 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-11-22 01:55:28,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 01:55:28,022 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:28,022 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:28,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:28,227 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-22 01:55:28,228 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:28,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:28,228 INFO L85 PathProgramCache]: Analyzing trace with hash -2129787765, now seen corresponding path program 7 times [2022-11-22 01:55:28,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:28,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112600265] [2022-11-22 01:55:28,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:28,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:28,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:28,397 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:28,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:28,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112600265] [2022-11-22 01:55:28,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112600265] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:28,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153228132] [2022-11-22 01:55:28,398 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:28,398 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:28,398 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:28,399 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:28,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-22 01:55:28,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:28,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:28,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:28,716 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:28,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:28,852 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:28,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153228132] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:28,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314055764] [2022-11-22 01:55:28,854 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:28,854 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:28,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:28,854 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:28,854 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:28,968 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:29,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3376#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:29,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:29,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:29,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 25 [2022-11-22 01:55:29,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031885416] [2022-11-22 01:55:29,418 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:29,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 01:55:29,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:29,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 01:55:29,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=950, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 01:55:29,420 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:29,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:29,685 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2022-11-22 01:55:29,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-22 01:55:29,685 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-22 01:55:29,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:29,686 INFO L225 Difference]: With dead ends: 68 [2022-11-22 01:55:29,686 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 01:55:29,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 41 SyntacticMatches, 9 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=305, Invalid=1587, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 01:55:29,688 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:29,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 96 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:29,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 01:55:29,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 30. [2022-11-22 01:55:29,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-22 01:55:29,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-22 01:55:29,698 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2022-11-22 01:55:29,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:29,699 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-22 01:55:29,699 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:29,699 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-22 01:55:29,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 01:55:29,700 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:29,700 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:29,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:29,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:29,905 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:29,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:29,906 INFO L85 PathProgramCache]: Analyzing trace with hash 426674588, now seen corresponding path program 4 times [2022-11-22 01:55:29,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:29,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417301827] [2022-11-22 01:55:29,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:29,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:29,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:30,102 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:30,102 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:30,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417301827] [2022-11-22 01:55:30,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417301827] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:30,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84927850] [2022-11-22 01:55:30,103 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:30,103 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:30,103 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:30,104 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:30,109 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-22 01:55:30,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:30,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:30,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:30,394 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:30,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:30,528 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:30,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84927850] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:30,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447406518] [2022-11-22 01:55:30,530 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:30,531 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:30,531 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:30,531 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:30,531 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:30,638 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:31,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3729#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:31,059 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:31,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:31,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-11-22 01:55:31,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693154095] [2022-11-22 01:55:31,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:31,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 01:55:31,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:31,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 01:55:31,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 01:55:31,061 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:31,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:31,362 INFO L93 Difference]: Finished difference Result 88 states and 97 transitions. [2022-11-22 01:55:31,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 01:55:31,362 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-22 01:55:31,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:31,363 INFO L225 Difference]: With dead ends: 88 [2022-11-22 01:55:31,363 INFO L226 Difference]: Without dead ends: 70 [2022-11-22 01:55:31,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 42 SyntacticMatches, 9 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 755 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:55:31,365 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 56 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:31,365 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 86 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:31,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-22 01:55:31,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 30. [2022-11-22 01:55:31,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-22 01:55:31,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-22 01:55:31,376 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2022-11-22 01:55:31,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:31,376 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-22 01:55:31,376 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:31,377 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-22 01:55:31,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 01:55:31,377 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:31,377 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:31,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:31,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-22 01:55:31,584 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:31,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:31,584 INFO L85 PathProgramCache]: Analyzing trace with hash -45048213, now seen corresponding path program 5 times [2022-11-22 01:55:31,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:31,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771567769] [2022-11-22 01:55:31,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:31,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:31,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:31,738 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:31,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:31,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771567769] [2022-11-22 01:55:31,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771567769] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:31,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169417028] [2022-11-22 01:55:31,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:31,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:31,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:31,740 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:31,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-22 01:55:31,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 01:55:31,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:31,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:31,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:32,015 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:32,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:32,141 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 26 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:32,141 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169417028] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:32,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479698382] [2022-11-22 01:55:32,143 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:32,143 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:32,143 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:32,143 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:32,143 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:32,259 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:32,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4120#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:32,657 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:32,657 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:32,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 23 [2022-11-22 01:55:32,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645321974] [2022-11-22 01:55:32,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:32,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-11-22 01:55:32,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:32,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-11-22 01:55:32,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2022-11-22 01:55:32,659 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:32,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:32,998 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2022-11-22 01:55:32,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 01:55:32,998 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-22 01:55:32,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:32,999 INFO L225 Difference]: With dead ends: 107 [2022-11-22 01:55:32,999 INFO L226 Difference]: Without dead ends: 89 [2022-11-22 01:55:33,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 43 SyntacticMatches, 9 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=310, Invalid=1760, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:55:33,000 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 53 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:33,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 96 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:33,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-22 01:55:33,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 30. [2022-11-22 01:55:33,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-22 01:55:33,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-22 01:55:33,018 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2022-11-22 01:55:33,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:33,018 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-22 01:55:33,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.125) internal successors, (51), 23 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:33,018 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-22 01:55:33,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 01:55:33,023 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:33,023 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:33,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:33,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-22 01:55:33,230 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:33,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:33,231 INFO L85 PathProgramCache]: Analyzing trace with hash 1602302908, now seen corresponding path program 6 times [2022-11-22 01:55:33,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:33,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910777904] [2022-11-22 01:55:33,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:33,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:33,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:33,400 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 16 proven. 17 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:33,401 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:33,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910777904] [2022-11-22 01:55:33,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910777904] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:33,401 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845949420] [2022-11-22 01:55:33,401 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:33,401 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:33,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:33,419 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:33,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-22 01:55:33,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:33,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:33,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:33,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:33,724 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:33,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:33,842 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:33,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845949420] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:33,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350302687] [2022-11-22 01:55:33,843 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:33,843 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:33,844 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:33,844 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:33,844 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:33,960 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:34,373 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4543#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:34,374 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:34,374 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:34,374 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 22 [2022-11-22 01:55:34,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131225473] [2022-11-22 01:55:34,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:34,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-22 01:55:34,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:34,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-22 01:55:34,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2022-11-22 01:55:34,375 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:34,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:34,710 INFO L93 Difference]: Finished difference Result 125 states and 136 transitions. [2022-11-22 01:55:34,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 01:55:34,710 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-22 01:55:34,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:34,711 INFO L225 Difference]: With dead ends: 125 [2022-11-22 01:55:34,711 INFO L226 Difference]: Without dead ends: 107 [2022-11-22 01:55:34,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 44 SyntacticMatches, 9 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=288, Invalid=1604, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 01:55:34,713 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 90 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:34,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 94 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 141 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:34,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-22 01:55:34,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 30. [2022-11-22 01:55:34,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.2413793103448276) internal successors, (36), 29 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) [2022-11-22 01:55:34,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2022-11-22 01:55:34,726 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 24 [2022-11-22 01:55:34,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:34,726 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2022-11-22 01:55:34,726 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.1739130434782608) internal successors, (50), 22 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:34,727 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2022-11-22 01:55:34,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-22 01:55:34,727 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:34,727 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:34,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-22 01:55:34,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-22 01:55:34,933 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:34,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:34,933 INFO L85 PathProgramCache]: Analyzing trace with hash 1932537931, now seen corresponding path program 4 times [2022-11-22 01:55:34,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:34,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898190820] [2022-11-22 01:55:34,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:34,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:34,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:35,083 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:35,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:35,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898190820] [2022-11-22 01:55:35,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898190820] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:35,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851550444] [2022-11-22 01:55:35,084 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:35,084 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:35,084 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:35,085 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:35,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-22 01:55:35,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:35,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-22 01:55:35,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:35,321 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:35,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:35,441 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:35,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851550444] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:35,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1538502824] [2022-11-22 01:55:35,443 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:35,443 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:35,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:35,443 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:35,444 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:35,549 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:35,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4992#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:35,964 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:35,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:35,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 21 [2022-11-22 01:55:35,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110520312] [2022-11-22 01:55:35,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:35,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-22 01:55:35,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:35,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-22 01:55:35,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=739, Unknown=0, NotChecked=0, Total=870 [2022-11-22 01:55:35,966 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 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) [2022-11-22 01:55:36,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:36,252 INFO L93 Difference]: Finished difference Result 144 states and 157 transitions. [2022-11-22 01:55:36,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 01:55:36,252 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-22 01:55:36,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:36,253 INFO L225 Difference]: With dead ends: 144 [2022-11-22 01:55:36,253 INFO L226 Difference]: Without dead ends: 126 [2022-11-22 01:55:36,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 45 SyntacticMatches, 9 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 483 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=254, Invalid=1306, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:55:36,254 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 101 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:36,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 76 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:36,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-11-22 01:55:36,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 31. [2022-11-22 01:55:36,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 30 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:36,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2022-11-22 01:55:36,267 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 24 [2022-11-22 01:55:36,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:36,268 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2022-11-22 01:55:36,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 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) [2022-11-22 01:55:36,268 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2022-11-22 01:55:36,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-22 01:55:36,269 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:36,269 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:36,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:36,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:36,474 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:36,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:36,475 INFO L85 PathProgramCache]: Analyzing trace with hash -1469256689, now seen corresponding path program 8 times [2022-11-22 01:55:36,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:36,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652711829] [2022-11-22 01:55:36,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:36,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:36,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:36,587 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:36,587 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:36,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652711829] [2022-11-22 01:55:36,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652711829] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:36,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675586357] [2022-11-22 01:55:36,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:36,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:36,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:36,591 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:36,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-22 01:55:36,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-11-22 01:55:36,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:36,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:36,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:36,691 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:36,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:36,762 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 15 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:36,762 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675586357] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:36,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815448009] [2022-11-22 01:55:36,763 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:36,764 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:36,764 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:36,764 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:36,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:36,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:37,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5462#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:37,222 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:37,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:37,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 9 [2022-11-22 01:55:37,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438883326] [2022-11-22 01:55:37,222 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:37,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-22 01:55:37,223 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:37,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-22 01:55:37,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2022-11-22 01:55:37,223 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 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) [2022-11-22 01:55:37,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:37,389 INFO L93 Difference]: Finished difference Result 42 states and 49 transitions. [2022-11-22 01:55:37,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-22 01:55:37,389 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 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 25 [2022-11-22 01:55:37,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:37,390 INFO L225 Difference]: With dead ends: 42 [2022-11-22 01:55:37,390 INFO L226 Difference]: Without dead ends: 40 [2022-11-22 01:55:37,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 59 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=139, Invalid=461, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:55:37,391 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 33 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:37,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 22 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:37,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-22 01:55:37,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2022-11-22 01:55:37,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 33 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:37,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2022-11-22 01:55:37,403 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2022-11-22 01:55:37,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:37,404 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2022-11-22 01:55:37,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 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) [2022-11-22 01:55:37,404 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2022-11-22 01:55:37,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:37,405 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:37,405 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:37,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:37,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:37,610 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:37,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:37,610 INFO L85 PathProgramCache]: Analyzing trace with hash -609465343, now seen corresponding path program 9 times [2022-11-22 01:55:37,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:37,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936432863] [2022-11-22 01:55:37,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:37,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:37,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:37,810 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:37,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:37,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936432863] [2022-11-22 01:55:37,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936432863] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:37,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439893399] [2022-11-22 01:55:37,810 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:37,811 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:37,811 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:37,813 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:37,844 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-22 01:55:37,873 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:37,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:37,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:37,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:38,183 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:38,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:38,344 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:38,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439893399] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:38,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [233857838] [2022-11-22 01:55:38,346 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:38,346 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:38,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:38,346 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:38,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:38,454 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:38,926 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5801#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:38,926 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:38,927 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:38,927 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 29 [2022-11-22 01:55:38,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39117469] [2022-11-22 01:55:38,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:38,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 01:55:38,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:38,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 01:55:38,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:55:38,929 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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) [2022-11-22 01:55:39,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:39,261 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2022-11-22 01:55:39,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-22 01:55:39,262 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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 28 [2022-11-22 01:55:39,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:39,262 INFO L225 Difference]: With dead ends: 80 [2022-11-22 01:55:39,262 INFO L226 Difference]: Without dead ends: 59 [2022-11-22 01:55:39,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 49 SyntacticMatches, 11 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=2059, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:55:39,264 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:39,264 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 113 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:39,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-11-22 01:55:39,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2022-11-22 01:55:39,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-22 01:55:39,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-22 01:55:39,280 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-11-22 01:55:39,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:39,280 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-22 01:55:39,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 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) [2022-11-22 01:55:39,280 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-22 01:55:39,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:39,281 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:39,281 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:39,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:39,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-22 01:55:39,483 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:39,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:39,483 INFO L85 PathProgramCache]: Analyzing trace with hash -1758338926, now seen corresponding path program 7 times [2022-11-22 01:55:39,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:39,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889682489] [2022-11-22 01:55:39,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:39,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:39,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:39,665 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:39,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:39,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889682489] [2022-11-22 01:55:39,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889682489] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:39,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019924811] [2022-11-22 01:55:39,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:39,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:39,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:39,668 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:39,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-22 01:55:39,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:39,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:39,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:40,011 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:40,011 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:40,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019924811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:40,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [193172123] [2022-11-22 01:55:40,181 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:40,181 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:40,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:40,182 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:40,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:40,298 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:40,733 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6216#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:40,734 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:40,734 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:40,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 28 [2022-11-22 01:55:40,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036932555] [2022-11-22 01:55:40,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:40,734 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 01:55:40,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:40,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 01:55:40,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1146, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 01:55:40,736 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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) [2022-11-22 01:55:41,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:41,167 INFO L93 Difference]: Finished difference Result 104 states and 114 transitions. [2022-11-22 01:55:41,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 01:55:41,167 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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 28 [2022-11-22 01:55:41,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:41,168 INFO L225 Difference]: With dead ends: 104 [2022-11-22 01:55:41,168 INFO L226 Difference]: Without dead ends: 83 [2022-11-22 01:55:41,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 50 SyntacticMatches, 11 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1054 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 01:55:41,170 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 52 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 232 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:41,170 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 133 Invalid, 232 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:41,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-22 01:55:41,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 35. [2022-11-22 01:55:41,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-22 01:55:41,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-22 01:55:41,191 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-11-22 01:55:41,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:41,192 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-22 01:55:41,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 28 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) [2022-11-22 01:55:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-22 01:55:41,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:41,192 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:41,192 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:41,197 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:41,392 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:41,393 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:41,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:41,393 INFO L85 PathProgramCache]: Analyzing trace with hash -548473375, now seen corresponding path program 8 times [2022-11-22 01:55:41,393 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:41,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [348036011] [2022-11-22 01:55:41,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:41,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:41,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:41,576 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:41,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:41,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [348036011] [2022-11-22 01:55:41,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [348036011] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:41,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191824818] [2022-11-22 01:55:41,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:41,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:41,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:41,578 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:41,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-22 01:55:41,643 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 01:55:41,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:41,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:41,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:41,912 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:41,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:42,068 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:42,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191824818] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:42,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104528960] [2022-11-22 01:55:42,069 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:42,069 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:42,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:42,070 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:42,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:42,170 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:42,590 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6678#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:42,590 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:42,590 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:42,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2022-11-22 01:55:42,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960286840] [2022-11-22 01:55:42,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:42,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 01:55:42,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:42,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 01:55:42,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1086, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 01:55:42,592 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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) [2022-11-22 01:55:43,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:43,044 INFO L93 Difference]: Finished difference Result 127 states and 138 transitions. [2022-11-22 01:55:43,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:55:43,045 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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 28 [2022-11-22 01:55:43,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:43,045 INFO L225 Difference]: With dead ends: 127 [2022-11-22 01:55:43,046 INFO L226 Difference]: Without dead ends: 106 [2022-11-22 01:55:43,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 51 SyntacticMatches, 11 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1053 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=426, Invalid=2436, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 01:55:43,047 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 63 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:43,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 128 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:43,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-11-22 01:55:43,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 35. [2022-11-22 01:55:43,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-22 01:55:43,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-22 01:55:43,063 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-11-22 01:55:43,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:43,063 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-22 01:55:43,064 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.107142857142857) internal successors, (59), 27 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) [2022-11-22 01:55:43,064 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-22 01:55:43,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:43,064 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:43,064 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:43,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:43,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:43,270 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:43,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:43,270 INFO L85 PathProgramCache]: Analyzing trace with hash -509445454, now seen corresponding path program 9 times [2022-11-22 01:55:43,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:43,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890155837] [2022-11-22 01:55:43,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:43,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:43,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:43,464 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 27 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:43,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:43,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890155837] [2022-11-22 01:55:43,465 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [890155837] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:43,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744620407] [2022-11-22 01:55:43,465 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:43,465 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:43,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:43,467 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:43,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-22 01:55:43,520 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:43,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:43,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:43,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:43,803 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:43,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:43,954 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 40 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:43,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744620407] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:43,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1766248733] [2022-11-22 01:55:43,955 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:43,956 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:43,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:43,956 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:43,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:44,074 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:44,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7181#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:44,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:44,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:44,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 26 [2022-11-22 01:55:44,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981460691] [2022-11-22 01:55:44,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:44,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-22 01:55:44,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:44,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-22 01:55:44,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1024, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 01:55:44,580 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 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) [2022-11-22 01:55:45,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:45,027 INFO L93 Difference]: Finished difference Result 149 states and 161 transitions. [2022-11-22 01:55:45,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 01:55:45,027 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-22 01:55:45,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:45,028 INFO L225 Difference]: With dead ends: 149 [2022-11-22 01:55:45,028 INFO L226 Difference]: Without dead ends: 128 [2022-11-22 01:55:45,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 52 SyntacticMatches, 11 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=412, Invalid=2344, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 01:55:45,030 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 81 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:45,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 125 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:45,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-11-22 01:55:45,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 35. [2022-11-22 01:55:45,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-22 01:55:45,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-22 01:55:45,055 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-11-22 01:55:45,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:45,055 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-22 01:55:45,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 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) [2022-11-22 01:55:45,056 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-22 01:55:45,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:45,056 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:45,056 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:45,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:45,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-22 01:55:45,262 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:45,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:45,262 INFO L85 PathProgramCache]: Analyzing trace with hash 1431476161, now seen corresponding path program 10 times [2022-11-22 01:55:45,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:45,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1196481952] [2022-11-22 01:55:45,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:45,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:45,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:45,453 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:45,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:45,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1196481952] [2022-11-22 01:55:45,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1196481952] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:45,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374970358] [2022-11-22 01:55:45,454 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:45,454 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:45,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:45,456 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:45,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-22 01:55:45,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:45,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:45,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:45,752 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:45,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 40 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:45,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [374970358] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:45,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1696529467] [2022-11-22 01:55:45,905 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:45,905 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:45,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:45,905 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:45,906 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:46,012 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:46,460 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7719#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:46,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:46,460 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:46,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 25 [2022-11-22 01:55:46,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029235902] [2022-11-22 01:55:46,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:46,461 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-22 01:55:46,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:46,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-22 01:55:46,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=960, Unknown=0, NotChecked=0, Total=1122 [2022-11-22 01:55:46,462 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 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) [2022-11-22 01:55:46,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:46,909 INFO L93 Difference]: Finished difference Result 170 states and 183 transitions. [2022-11-22 01:55:46,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:55:46,909 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 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 28 [2022-11-22 01:55:46,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:46,910 INFO L225 Difference]: With dead ends: 170 [2022-11-22 01:55:46,910 INFO L226 Difference]: Without dead ends: 149 [2022-11-22 01:55:46,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 53 SyntacticMatches, 11 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 829 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=373, Invalid=2077, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:55:46,911 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 102 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:46,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [102 Valid, 100 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:46,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-11-22 01:55:46,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 35. [2022-11-22 01:55:46,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 34 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) [2022-11-22 01:55:46,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-11-22 01:55:46,930 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-11-22 01:55:46,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:46,930 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-11-22 01:55:46,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 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) [2022-11-22 01:55:46,931 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-11-22 01:55:46,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-22 01:55:46,931 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:46,931 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:46,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:47,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-22 01:55:47,135 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:47,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:47,135 INFO L85 PathProgramCache]: Analyzing trace with hash -307028782, now seen corresponding path program 5 times [2022-11-22 01:55:47,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:47,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674352777] [2022-11-22 01:55:47,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:47,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:47,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:47,321 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 27 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:47,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:47,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674352777] [2022-11-22 01:55:47,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674352777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:47,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [222093879] [2022-11-22 01:55:47,322 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:47,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:47,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:47,323 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:47,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-22 01:55:47,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-22 01:55:47,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:47,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-22 01:55:47,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:47,619 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:47,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:47,768 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 40 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:47,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [222093879] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:47,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1332548897] [2022-11-22 01:55:47,769 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:47,769 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:47,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:47,770 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:47,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:47,853 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:48,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8286#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:48,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:48,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:48,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 24 [2022-11-22 01:55:48,297 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208521067] [2022-11-22 01:55:48,297 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:48,298 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-22 01:55:48,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:48,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-22 01:55:48,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=895, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 01:55:48,299 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:48,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:48,694 INFO L93 Difference]: Finished difference Result 192 states and 207 transitions. [2022-11-22 01:55:48,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 01:55:48,694 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-11-22 01:55:48,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:48,695 INFO L225 Difference]: With dead ends: 192 [2022-11-22 01:55:48,695 INFO L226 Difference]: Without dead ends: 171 [2022-11-22 01:55:48,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 54 SyntacticMatches, 11 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=323, Invalid=1657, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 01:55:48,697 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 161 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:48,697 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 100 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:48,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-11-22 01:55:48,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 36. [2022-11-22 01:55:48,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 35 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:48,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2022-11-22 01:55:48,719 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 28 [2022-11-22 01:55:48,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:48,720 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2022-11-22 01:55:48,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:48,720 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2022-11-22 01:55:48,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-22 01:55:48,720 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:48,720 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:48,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:48,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:48,921 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:48,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:48,921 INFO L85 PathProgramCache]: Analyzing trace with hash -494677627, now seen corresponding path program 10 times [2022-11-22 01:55:48,921 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:48,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102760202] [2022-11-22 01:55:48,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:48,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:48,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:49,038 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:49,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:49,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102760202] [2022-11-22 01:55:49,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [102760202] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:49,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694720344] [2022-11-22 01:55:49,039 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:49,039 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:49,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:49,042 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:49,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-22 01:55:49,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:49,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:49,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:49,141 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:49,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:49,235 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 21 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:49,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694720344] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:49,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605912735] [2022-11-22 01:55:49,237 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:49,237 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:49,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:49,237 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:49,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:49,355 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:49,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8875#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:49,738 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:49,738 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:49,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 10 [2022-11-22 01:55:49,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328477330] [2022-11-22 01:55:49,738 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:49,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-22 01:55:49,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:49,738 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-22 01:55:49,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-11-22 01:55:49,739 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 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) [2022-11-22 01:55:49,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:49,946 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2022-11-22 01:55:49,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-22 01:55:49,947 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-11-22 01:55:49,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:49,947 INFO L225 Difference]: With dead ends: 47 [2022-11-22 01:55:49,947 INFO L226 Difference]: Without dead ends: 45 [2022-11-22 01:55:49,948 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 70 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=165, Invalid=537, Unknown=0, NotChecked=0, Total=702 [2022-11-22 01:55:49,948 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 38 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:49,949 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 22 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:49,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-11-22 01:55:49,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2022-11-22 01:55:49,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.236842105263158) internal successors, (47), 38 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:49,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2022-11-22 01:55:49,972 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 29 [2022-11-22 01:55:49,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:49,972 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2022-11-22 01:55:49,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 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) [2022-11-22 01:55:49,973 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2022-11-22 01:55:49,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:55:49,973 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:49,973 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:49,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:50,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-22 01:55:50,179 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:50,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:50,179 INFO L85 PathProgramCache]: Analyzing trace with hash -903550261, now seen corresponding path program 11 times [2022-11-22 01:55:50,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:50,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932379571] [2022-11-22 01:55:50,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:50,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:50,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:50,399 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:50,399 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:50,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932379571] [2022-11-22 01:55:50,400 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932379571] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:50,400 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603691071] [2022-11-22 01:55:50,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:50,400 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:50,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:50,403 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:50,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-22 01:55:50,468 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 01:55:50,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:50,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:50,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:50,854 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:50,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:51,041 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:51,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603691071] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:51,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [471118526] [2022-11-22 01:55:51,043 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:51,043 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:51,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:51,043 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:51,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:51,141 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:51,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9262#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:51,626 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:51,626 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:51,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 33 [2022-11-22 01:55:51,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616476714] [2022-11-22 01:55:51,626 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:51,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-22 01:55:51,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:51,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-22 01:55:51,628 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=1460, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 01:55:51,628 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 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) [2022-11-22 01:55:52,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:52,029 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2022-11-22 01:55:52,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-22 01:55:52,029 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:55:52,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:52,029 INFO L225 Difference]: With dead ends: 92 [2022-11-22 01:55:52,029 INFO L226 Difference]: Without dead ends: 68 [2022-11-22 01:55:52,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 57 SyntacticMatches, 13 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1277 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=489, Invalid=2591, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:55:52,031 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 200 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:52,031 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 124 Invalid, 200 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:52,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-11-22 01:55:52,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 40. [2022-11-22 01:55:52,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:55:52,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:55:52,048 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:55:52,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:52,048 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:55:52,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 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) [2022-11-22 01:55:52,049 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:55:52,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:55:52,049 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:52,049 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:52,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-11-22 01:55:52,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-22 01:55:52,255 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:52,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:52,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1757138652, now seen corresponding path program 11 times [2022-11-22 01:55:52,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:52,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112238971] [2022-11-22 01:55:52,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:52,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:52,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:52,466 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:52,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:52,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112238971] [2022-11-22 01:55:52,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112238971] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:52,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214712466] [2022-11-22 01:55:52,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:52,466 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:52,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:52,468 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:52,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-22 01:55:52,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 01:55:52,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:52,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:52,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:52,847 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:52,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:53,020 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:53,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1214712466] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:53,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057271731] [2022-11-22 01:55:53,026 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:53,026 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:53,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:53,026 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:53,027 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:53,138 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:53,582 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9739#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:53,582 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:53,582 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:53,582 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 32 [2022-11-22 01:55:53,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149602581] [2022-11-22 01:55:53,583 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:53,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 01:55:53,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:53,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 01:55:53,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1409, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 01:55:53,585 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 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) [2022-11-22 01:55:54,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:54,058 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2022-11-22 01:55:54,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:55:54,058 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:55:54,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:54,059 INFO L225 Difference]: With dead ends: 120 [2022-11-22 01:55:54,059 INFO L226 Difference]: Without dead ends: 96 [2022-11-22 01:55:54,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 58 SyntacticMatches, 13 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1401 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:55:54,062 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 62 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:54,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 80 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:54,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-22 01:55:54,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 40. [2022-11-22 01:55:54,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:55:54,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:55:54,084 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:55:54,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:54,085 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:55:54,085 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0606060606060606) internal successors, (68), 32 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) [2022-11-22 01:55:54,085 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:55:54,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:55:54,085 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:54,085 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:54,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:54,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-22 01:55:54,286 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:54,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:54,286 INFO L85 PathProgramCache]: Analyzing trace with hash -2036357973, now seen corresponding path program 12 times [2022-11-22 01:55:54,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:54,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039888643] [2022-11-22 01:55:54,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:54,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:54,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:54,506 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:54,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:54,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039888643] [2022-11-22 01:55:54,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039888643] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:54,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130200076] [2022-11-22 01:55:54,507 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:55:54,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:54,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:54,511 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:54,533 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-22 01:55:54,564 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:55:54,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:54,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:54,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:54,909 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:54,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:55,074 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:55,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130200076] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:55,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610450914] [2022-11-22 01:55:55,076 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:55,076 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:55,076 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:55,076 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:55,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:55,176 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:55,604 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10272#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:55,605 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:55,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:55,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 31 [2022-11-22 01:55:55,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631901407] [2022-11-22 01:55:55,605 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:55,605 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 01:55:55,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:55,606 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 01:55:55,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:55:55,606 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 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) [2022-11-22 01:55:56,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:56,158 INFO L93 Difference]: Finished difference Result 147 states and 159 transitions. [2022-11-22 01:55:56,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 01:55:56,158 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:55:56,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:56,158 INFO L225 Difference]: With dead ends: 147 [2022-11-22 01:55:56,158 INFO L226 Difference]: Without dead ends: 123 [2022-11-22 01:55:56,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 59 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1442 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:55:56,159 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 87 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:56,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 116 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:56,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-22 01:55:56,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 40. [2022-11-22 01:55:56,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:55:56,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:55:56,179 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:55:56,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:56,179 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:55:56,179 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 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) [2022-11-22 01:55:56,179 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:55:56,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:55:56,179 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:56,180 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:56,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:56,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:56,380 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:56,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:56,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1997691132, now seen corresponding path program 13 times [2022-11-22 01:55:56,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:56,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1091251904] [2022-11-22 01:55:56,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:56,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:56,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:56,592 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 41 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:56,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:56,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1091251904] [2022-11-22 01:55:56,592 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1091251904] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:56,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046403203] [2022-11-22 01:55:56,593 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:55:56,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:56,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:56,597 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:56,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-22 01:55:56,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:56,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:56,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:56,944 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:56,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:57,107 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 57 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:57,107 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046403203] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:57,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1389097723] [2022-11-22 01:55:57,109 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:57,109 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:57,109 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:57,109 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:57,109 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:57,205 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:57,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10855#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:57,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:57,633 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:57,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2022-11-22 01:55:57,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215593191] [2022-11-22 01:55:57,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:57,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-22 01:55:57,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:57,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-22 01:55:57,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=205, Invalid=1277, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 01:55:57,635 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:58,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:55:58,250 INFO L93 Difference]: Finished difference Result 173 states and 186 transitions. [2022-11-22 01:55:58,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 01:55:58,250 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 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 [2022-11-22 01:55:58,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:55:58,251 INFO L225 Difference]: With dead ends: 173 [2022-11-22 01:55:58,251 INFO L226 Difference]: Without dead ends: 149 [2022-11-22 01:55:58,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 60 SyntacticMatches, 13 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=563, Invalid=3219, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:55:58,252 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 68 mSDsluCounter, 148 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:55:58,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 163 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:55:58,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-11-22 01:55:58,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 40. [2022-11-22 01:55:58,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:55:58,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:55:58,277 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:55:58,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:55:58,277 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:55:58,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.129032258064516) internal successors, (66), 30 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:55:58,278 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:55:58,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:55:58,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:55:58,278 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:55:58,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-22 01:55:58,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2022-11-22 01:55:58,482 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:55:58,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:55:58,483 INFO L85 PathProgramCache]: Analyzing trace with hash 742348427, now seen corresponding path program 14 times [2022-11-22 01:55:58,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:55:58,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692263339] [2022-11-22 01:55:58,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:55:58,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:55:58,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:55:58,690 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 41 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:58,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:55:58,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692263339] [2022-11-22 01:55:58,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692263339] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:55:58,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315439633] [2022-11-22 01:55:58,690 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:55:58,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:55:58,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:55:58,692 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:55:58,714 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-22 01:55:58,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-22 01:55:58,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:55:58,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:55:58,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:55:59,064 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:59,065 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:55:59,229 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 57 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:55:59,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315439633] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:55:59,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1551223548] [2022-11-22 01:55:59,231 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:55:59,231 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:55:59,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:55:59,231 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:55:59,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:55:59,338 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:55:59,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11482#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:55:59,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:55:59,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:55:59,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 29 [2022-11-22 01:55:59,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951623505] [2022-11-22 01:55:59,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:55:59,776 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-22 01:55:59,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:55:59,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-22 01:55:59,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1208, Unknown=0, NotChecked=0, Total=1406 [2022-11-22 01:55:59,777 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:00,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:00,400 INFO L93 Difference]: Finished difference Result 198 states and 212 transitions. [2022-11-22 01:56:00,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 01:56:00,401 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:56:00,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:00,402 INFO L225 Difference]: With dead ends: 198 [2022-11-22 01:56:00,402 INFO L226 Difference]: Without dead ends: 174 [2022-11-22 01:56:00,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 61 SyntacticMatches, 13 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1273 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=530, Invalid=3010, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:56:00,403 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 97 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:00,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 130 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:00,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-22 01:56:00,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 40. [2022-11-22 01:56:00,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:56:00,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:56:00,436 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:56:00,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:00,437 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:56:00,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:00,437 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:56:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:56:00,438 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:00,438 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:00,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:00,642 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-11-22 01:56:00,643 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:00,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:00,643 INFO L85 PathProgramCache]: Analyzing trace with hash -406525156, now seen corresponding path program 15 times [2022-11-22 01:56:00,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:00,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326064366] [2022-11-22 01:56:00,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:00,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:00,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:00,855 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 41 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:00,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:00,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326064366] [2022-11-22 01:56:00,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326064366] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:00,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752224221] [2022-11-22 01:56:00,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:00,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:00,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:00,858 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:00,880 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-22 01:56:00,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:00,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:00,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:56:00,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:01,217 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:01,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:01,408 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 57 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:01,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752224221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:01,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [455177884] [2022-11-22 01:56:01,409 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:01,409 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:01,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:01,409 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:01,409 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:01,509 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:01,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12147#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:01,950 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:01,950 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:01,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 28 [2022-11-22 01:56:01,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253105913] [2022-11-22 01:56:01,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:01,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-22 01:56:01,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:01,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-22 01:56:01,952 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1137, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 01:56:01,952 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:02,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:02,527 INFO L93 Difference]: Finished difference Result 222 states and 237 transitions. [2022-11-22 01:56:02,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 01:56:02,527 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:56:02,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:02,528 INFO L225 Difference]: With dead ends: 222 [2022-11-22 01:56:02,528 INFO L226 Difference]: Without dead ends: 198 [2022-11-22 01:56:02,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 62 SyntacticMatches, 13 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1062 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=470, Invalid=2610, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:56:02,529 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 100 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:02,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 139 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:02,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2022-11-22 01:56:02,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 40. [2022-11-22 01:56:02,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 39 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) [2022-11-22 01:56:02,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-11-22 01:56:02,565 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 32 [2022-11-22 01:56:02,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:02,565 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-11-22 01:56:02,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:02,566 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-11-22 01:56:02,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-11-22 01:56:02,566 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:02,566 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:02,572 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:02,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:02,772 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:02,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:02,772 INFO L85 PathProgramCache]: Analyzing trace with hash 803340395, now seen corresponding path program 6 times [2022-11-22 01:56:02,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:02,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [421122956] [2022-11-22 01:56:02,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:02,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:02,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:02,983 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 41 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:02,983 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:02,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [421122956] [2022-11-22 01:56:02,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [421122956] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:02,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432612106] [2022-11-22 01:56:02,984 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:02,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:02,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:02,985 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:03,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-22 01:56:03,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:03,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:03,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-22 01:56:03,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:03,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:03,487 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 57 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:03,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432612106] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:03,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1391301229] [2022-11-22 01:56:03,489 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:03,489 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:03,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:03,489 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:03,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:03,593 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:04,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12844#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:04,156 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:04,157 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:04,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 27 [2022-11-22 01:56:04,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186767319] [2022-11-22 01:56:04,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:04,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-22 01:56:04,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:04,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-22 01:56:04,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1065, Unknown=0, NotChecked=0, Total=1260 [2022-11-22 01:56:04,158 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:04,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:04,689 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2022-11-22 01:56:04,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:56:04,689 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-11-22 01:56:04,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:04,690 INFO L225 Difference]: With dead ends: 247 [2022-11-22 01:56:04,691 INFO L226 Difference]: Without dead ends: 223 [2022-11-22 01:56:04,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 63 SyntacticMatches, 13 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=401, Invalid=2049, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:56:04,692 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 130 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:04,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 121 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:04,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2022-11-22 01:56:04,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 41. [2022-11-22 01:56:04,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.25) internal successors, (50), 40 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:04,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 50 transitions. [2022-11-22 01:56:04,723 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 50 transitions. Word has length 32 [2022-11-22 01:56:04,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:04,723 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 50 transitions. [2022-11-22 01:56:04,723 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2142857142857144) internal successors, (62), 27 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:04,723 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 50 transitions. [2022-11-22 01:56:04,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-22 01:56:04,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:04,724 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:04,727 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-11-22 01:56:04,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:04,924 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:04,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:04,924 INFO L85 PathProgramCache]: Analyzing trace with hash -420082097, now seen corresponding path program 12 times [2022-11-22 01:56:04,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:04,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694607420] [2022-11-22 01:56:04,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:04,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:04,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:05,071 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:05,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:05,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694607420] [2022-11-22 01:56:05,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694607420] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:05,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824410552] [2022-11-22 01:56:05,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:05,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:05,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:05,073 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:05,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-22 01:56:05,131 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:05,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:05,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:05,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:05,191 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:05,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:05,312 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 28 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:05,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824410552] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:05,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447916401] [2022-11-22 01:56:05,314 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:05,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:05,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:05,314 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:05,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:05,399 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:05,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13564#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:05,781 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:05,781 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:05,781 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 11 [2022-11-22 01:56:05,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272840450] [2022-11-22 01:56:05,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:05,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-11-22 01:56:05,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:05,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-11-22 01:56:05,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-11-22 01:56:05,782 INFO L87 Difference]: Start difference. First operand 41 states and 50 transitions. Second operand has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:06,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:06,006 INFO L93 Difference]: Finished difference Result 52 states and 61 transitions. [2022-11-22 01:56:06,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-22 01:56:06,007 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-11-22 01:56:06,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:06,007 INFO L225 Difference]: With dead ends: 52 [2022-11-22 01:56:06,007 INFO L226 Difference]: Without dead ends: 50 [2022-11-22 01:56:06,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 81 SyntacticMatches, 14 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=194, Invalid=618, Unknown=0, NotChecked=0, Total=812 [2022-11-22 01:56:06,008 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 72 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:06,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 19 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:06,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-11-22 01:56:06,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2022-11-22 01:56:06,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 43 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) [2022-11-22 01:56:06,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-22 01:56:06,040 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 33 [2022-11-22 01:56:06,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:06,040 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-22 01:56:06,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.9166666666666665) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:06,040 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-22 01:56:06,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:06,041 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:06,041 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:06,045 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:06,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-11-22 01:56:06,241 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:06,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:06,241 INFO L85 PathProgramCache]: Analyzing trace with hash 873791937, now seen corresponding path program 13 times [2022-11-22 01:56:06,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:06,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067608285] [2022-11-22 01:56:06,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:06,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:06,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:06,506 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:06,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:06,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067608285] [2022-11-22 01:56:06,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067608285] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:06,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389380511] [2022-11-22 01:56:06,507 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:06,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:06,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:06,508 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:06,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-22 01:56:06,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:06,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:06,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:06,976 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:06,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:07,183 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:07,183 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389380511] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:07,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783975594] [2022-11-22 01:56:07,187 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:07,187 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:07,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:07,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:07,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:07,266 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:07,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13999#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:07,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:07,751 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:07,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 37 [2022-11-22 01:56:07,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225829067] [2022-11-22 01:56:07,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:07,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 01:56:07,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:07,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 01:56:07,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=1754, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:56:07,752 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 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) [2022-11-22 01:56:08,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:08,268 INFO L93 Difference]: Finished difference Result 104 states and 115 transitions. [2022-11-22 01:56:08,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-22 01:56:08,268 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:08,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:08,269 INFO L225 Difference]: With dead ends: 104 [2022-11-22 01:56:08,269 INFO L226 Difference]: Without dead ends: 77 [2022-11-22 01:56:08,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 65 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1612 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=599, Invalid=3183, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:56:08,270 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 34 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 170 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:08,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 170 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:08,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-22 01:56:08,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 45. [2022-11-22 01:56:08,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:08,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:08,300 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:08,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:08,300 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:08,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 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) [2022-11-22 01:56:08,300 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:08,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:08,301 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:08,301 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:08,305 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-11-22 01:56:08,501 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-22 01:56:08,501 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:08,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:08,502 INFO L85 PathProgramCache]: Analyzing trace with hash 629765458, now seen corresponding path program 16 times [2022-11-22 01:56:08,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:08,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940197943] [2022-11-22 01:56:08,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:08,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:08,743 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:08,744 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:08,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940197943] [2022-11-22 01:56:08,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940197943] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:08,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036976326] [2022-11-22 01:56:08,744 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:08,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:08,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:08,746 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:08,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-22 01:56:08,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:08,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:08,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:09,203 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:09,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:09,408 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:09,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036976326] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:09,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [779927156] [2022-11-22 01:56:09,410 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:09,410 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:09,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:09,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:09,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:09,525 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:09,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14538#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:09,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:09,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:09,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-11-22 01:56:09,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382410836] [2022-11-22 01:56:09,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:09,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 01:56:09,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:09,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 01:56:09,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=1698, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 01:56:09,991 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 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) [2022-11-22 01:56:10,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:10,655 INFO L93 Difference]: Finished difference Result 136 states and 148 transitions. [2022-11-22 01:56:10,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 01:56:10,656 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:10,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:10,656 INFO L225 Difference]: With dead ends: 136 [2022-11-22 01:56:10,656 INFO L226 Difference]: Without dead ends: 109 [2022-11-22 01:56:10,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 66 SyntacticMatches, 15 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1796 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 01:56:10,657 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 50 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 302 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 302 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:10,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 167 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 302 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:56:10,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-11-22 01:56:10,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 45. [2022-11-22 01:56:10,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:10,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:10,690 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:10,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:10,690 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:10,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.054054054054054) internal successors, (76), 36 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) [2022-11-22 01:56:10,690 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:10,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:10,691 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:10,691 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:10,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-11-22 01:56:10,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:10,892 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:10,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:10,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1591724961, now seen corresponding path program 17 times [2022-11-22 01:56:10,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:10,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671051915] [2022-11-22 01:56:10,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:10,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:10,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:11,149 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:11,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:11,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671051915] [2022-11-22 01:56:11,150 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671051915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:11,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025914109] [2022-11-22 01:56:11,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:11,150 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:11,150 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:11,151 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:11,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-22 01:56:11,213 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 01:56:11,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:11,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:11,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:11,617 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:11,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:11,832 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:11,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025914109] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:11,832 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [116514321] [2022-11-22 01:56:11,833 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:11,833 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:11,834 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:11,834 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:11,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:11,937 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:12,395 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15142#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:12,395 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:12,395 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:12,395 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2022-11-22 01:56:12,395 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498116099] [2022-11-22 01:56:12,395 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:12,396 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 01:56:12,396 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:12,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 01:56:12,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1628, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 01:56:12,397 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 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) [2022-11-22 01:56:13,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:13,113 INFO L93 Difference]: Finished difference Result 167 states and 180 transitions. [2022-11-22 01:56:13,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 01:56:13,113 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 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 36 [2022-11-22 01:56:13,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:13,113 INFO L225 Difference]: With dead ends: 167 [2022-11-22 01:56:13,113 INFO L226 Difference]: Without dead ends: 140 [2022-11-22 01:56:13,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 67 SyntacticMatches, 15 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1891 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 01:56:13,115 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 85 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 225 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:13,115 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 140 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 225 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:13,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-11-22 01:56:13,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 45. [2022-11-22 01:56:13,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:13,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:13,153 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:13,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:13,154 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:13,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0833333333333335) internal successors, (75), 35 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) [2022-11-22 01:56:13,154 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:13,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:13,155 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:13,155 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:13,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:13,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-22 01:56:13,360 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:13,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:13,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1286738062, now seen corresponding path program 18 times [2022-11-22 01:56:13,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:13,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59269641] [2022-11-22 01:56:13,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:13,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:13,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:13,597 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:13,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:13,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59269641] [2022-11-22 01:56:13,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59269641] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:13,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624285418] [2022-11-22 01:56:13,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:13,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:13,598 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:13,599 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:13,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-22 01:56:13,650 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:13,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:13,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:13,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:14,027 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:14,027 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:14,226 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:14,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624285418] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:14,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [53362427] [2022-11-22 01:56:14,227 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:14,227 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:14,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:14,228 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:14,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:14,327 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:14,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15805#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:14,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:14,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:14,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 34 [2022-11-22 01:56:14,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119566824] [2022-11-22 01:56:14,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:14,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 01:56:14,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:14,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 01:56:14,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 01:56:14,781 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:15,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:15,587 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2022-11-22 01:56:15,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 01:56:15,587 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:15,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:15,588 INFO L225 Difference]: With dead ends: 197 [2022-11-22 01:56:15,588 INFO L226 Difference]: Without dead ends: 170 [2022-11-22 01:56:15,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 68 SyntacticMatches, 15 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1891 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=741, Invalid=4229, Unknown=0, NotChecked=0, Total=4970 [2022-11-22 01:56:15,589 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 91 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:15,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 156 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:15,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-11-22 01:56:15,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 45. [2022-11-22 01:56:15,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:15,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:15,629 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:15,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:15,630 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:15,630 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 34 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:15,630 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:15,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:15,630 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:15,630 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:15,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:15,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-22 01:56:15,831 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:15,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:15,831 INFO L85 PathProgramCache]: Analyzing trace with hash -409760383, now seen corresponding path program 19 times [2022-11-22 01:56:15,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:15,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589235962] [2022-11-22 01:56:15,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:15,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:15,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:16,068 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 58 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:16,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:16,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589235962] [2022-11-22 01:56:16,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589235962] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:16,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658417622] [2022-11-22 01:56:16,068 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:16,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:16,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:16,069 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:16,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-22 01:56:16,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:16,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:16,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:16,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:16,662 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 77 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:16,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658417622] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:16,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2024809548] [2022-11-22 01:56:16,664 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:16,664 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:16,664 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:16,664 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:16,664 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:16,767 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:17,213 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16521#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:17,214 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:17,214 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:17,214 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2022-11-22 01:56:17,214 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500742937] [2022-11-22 01:56:17,214 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:17,214 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-22 01:56:17,214 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:17,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-22 01:56:17,215 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=1482, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 01:56:17,215 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 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) [2022-11-22 01:56:18,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:18,066 INFO L93 Difference]: Finished difference Result 226 states and 241 transitions. [2022-11-22 01:56:18,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:56:18,066 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 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 36 [2022-11-22 01:56:18,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:18,066 INFO L225 Difference]: With dead ends: 226 [2022-11-22 01:56:18,067 INFO L226 Difference]: Without dead ends: 199 [2022-11-22 01:56:18,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 69 SyntacticMatches, 15 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1795 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=721, Invalid=4109, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 01:56:18,070 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 156 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:18,071 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 129 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:18,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-22 01:56:18,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 45. [2022-11-22 01:56:18,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:18,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:18,108 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:18,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:18,108 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:18,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 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) [2022-11-22 01:56:18,109 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:18,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:18,109 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:18,109 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:18,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-22 01:56:18,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-22 01:56:18,310 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:18,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:18,310 INFO L85 PathProgramCache]: Analyzing trace with hash -2044038766, now seen corresponding path program 20 times [2022-11-22 01:56:18,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:18,310 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505213195] [2022-11-22 01:56:18,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:18,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:18,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:18,564 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 58 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:18,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:18,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505213195] [2022-11-22 01:56:18,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505213195] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:18,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366436776] [2022-11-22 01:56:18,565 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:18,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:18,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:18,567 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:18,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-22 01:56:18,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 01:56:18,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:18,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:18,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:18,962 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:18,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:19,165 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 77 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:19,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366436776] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:19,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799165650] [2022-11-22 01:56:19,167 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:19,167 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:19,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:19,167 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:19,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:19,263 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:19,751 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17284#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:19,751 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:19,751 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:19,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 32 [2022-11-22 01:56:19,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753096835] [2022-11-22 01:56:19,752 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:19,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-22 01:56:19,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:19,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-22 01:56:19,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1406, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 01:56:19,752 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:20,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:20,561 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2022-11-22 01:56:20,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 01:56:20,561 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:20,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:20,561 INFO L225 Difference]: With dead ends: 254 [2022-11-22 01:56:20,561 INFO L226 Difference]: Without dead ends: 227 [2022-11-22 01:56:20,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 70 SyntacticMatches, 15 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1606 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=664, Invalid=3758, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 01:56:20,562 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 125 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:20,562 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 151 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 229 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:20,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-11-22 01:56:20,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 45. [2022-11-22 01:56:20,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:20,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:20,605 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:20,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:20,605 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:20,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.1818181818181817) internal successors, (72), 32 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:20,605 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:20,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:20,605 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:20,605 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:20,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:20,806 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:20,806 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:20,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:20,806 INFO L85 PathProgramCache]: Analyzing trace with hash -1542568095, now seen corresponding path program 21 times [2022-11-22 01:56:20,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:20,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686227303] [2022-11-22 01:56:20,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:20,807 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:20,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:21,050 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 58 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:21,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:21,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686227303] [2022-11-22 01:56:21,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686227303] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:21,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690003852] [2022-11-22 01:56:21,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:21,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:21,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:21,052 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:21,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-22 01:56:21,111 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:21,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:21,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:21,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:21,445 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:21,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:21,639 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:21,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690003852] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:21,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140800793] [2022-11-22 01:56:21,640 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:21,640 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:21,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:21,640 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:21,640 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:21,737 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:22,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18088#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:22,186 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:22,186 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:22,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2022-11-22 01:56:22,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [788074369] [2022-11-22 01:56:22,186 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:22,186 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-22 01:56:22,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:22,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-22 01:56:22,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=1328, Unknown=0, NotChecked=0, Total=1560 [2022-11-22 01:56:22,187 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:23,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:23,022 INFO L93 Difference]: Finished difference Result 281 states and 298 transitions. [2022-11-22 01:56:23,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 01:56:23,022 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:23,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:23,023 INFO L225 Difference]: With dead ends: 281 [2022-11-22 01:56:23,023 INFO L226 Difference]: Without dead ends: 254 [2022-11-22 01:56:23,024 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 71 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1323 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=579, Invalid=3203, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:56:23,024 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 135 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:23,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [135 Valid, 160 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:23,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-11-22 01:56:23,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 45. [2022-11-22 01:56:23,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.2272727272727273) internal successors, (54), 44 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) [2022-11-22 01:56:23,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-22 01:56:23,064 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 36 [2022-11-22 01:56:23,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:23,065 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-22 01:56:23,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.21875) internal successors, (71), 31 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:23,065 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-22 01:56:23,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-22 01:56:23,065 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:23,065 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:23,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-11-22 01:56:23,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-22 01:56:23,266 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:23,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:23,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1803486286, now seen corresponding path program 7 times [2022-11-22 01:56:23,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:23,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323586992] [2022-11-22 01:56:23,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:23,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:23,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:23,497 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 58 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:23,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323586992] [2022-11-22 01:56:23,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323586992] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:23,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302897443] [2022-11-22 01:56:23,498 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:23,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:23,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:23,501 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:23,507 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-22 01:56:23,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:23,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-22 01:56:23,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:23,860 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:23,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 77 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:24,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302897443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:24,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88287709] [2022-11-22 01:56:24,051 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:24,051 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:24,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:24,052 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:24,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:24,147 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:24,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18927#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:24,703 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:24,703 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:24,703 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 30 [2022-11-22 01:56:24,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496260374] [2022-11-22 01:56:24,703 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:24,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-22 01:56:24,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:24,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-22 01:56:24,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=1249, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 01:56:24,704 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:25,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:25,446 INFO L93 Difference]: Finished difference Result 309 states and 328 transitions. [2022-11-22 01:56:25,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 01:56:25,446 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-11-22 01:56:25,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:25,447 INFO L225 Difference]: With dead ends: 309 [2022-11-22 01:56:25,447 INFO L226 Difference]: Without dead ends: 282 [2022-11-22 01:56:25,448 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 72 SyntacticMatches, 15 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1002 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=488, Invalid=2482, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 01:56:25,448 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 121 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:25,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [121 Valid, 140 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:25,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2022-11-22 01:56:25,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 46. [2022-11-22 01:56:25,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 45 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:25,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2022-11-22 01:56:25,513 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 36 [2022-11-22 01:56:25,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:25,514 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2022-11-22 01:56:25,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 30 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:25,514 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2022-11-22 01:56:25,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-22 01:56:25,515 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:25,515 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:25,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:25,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-11-22 01:56:25,720 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:25,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:25,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1960887109, now seen corresponding path program 14 times [2022-11-22 01:56:25,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:25,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974224420] [2022-11-22 01:56:25,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:25,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:25,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:25,864 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:25,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:25,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974224420] [2022-11-22 01:56:25,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974224420] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:25,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950247706] [2022-11-22 01:56:25,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:25,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:25,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:25,866 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:25,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-22 01:56:25,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-22 01:56:25,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:25,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:25,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:25,988 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:25,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:26,111 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:26,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950247706] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:26,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911565607] [2022-11-22 01:56:26,113 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:26,113 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:26,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:26,113 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:26,113 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:26,202 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:26,566 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19790#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:26,567 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:26,567 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:26,567 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 12 [2022-11-22 01:56:26,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592083651] [2022-11-22 01:56:26,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:26,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-22 01:56:26,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:26,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-22 01:56:26,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2022-11-22 01:56:26,568 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 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) [2022-11-22 01:56:26,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:26,857 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2022-11-22 01:56:26,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-22 01:56:26,858 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 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 37 [2022-11-22 01:56:26,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:26,858 INFO L225 Difference]: With dead ends: 57 [2022-11-22 01:56:26,858 INFO L226 Difference]: Without dead ends: 55 [2022-11-22 01:56:26,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 92 SyntacticMatches, 16 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2022-11-22 01:56:26,859 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 66 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:26,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 18 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:26,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-22 01:56:26,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2022-11-22 01:56:26,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.2291666666666667) internal successors, (59), 48 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) [2022-11-22 01:56:26,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2022-11-22 01:56:26,914 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 37 [2022-11-22 01:56:26,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:26,914 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2022-11-22 01:56:26,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 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) [2022-11-22 01:56:26,914 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2022-11-22 01:56:26,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:26,914 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:26,914 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:26,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-11-22 01:56:27,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:27,115 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:27,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:27,115 INFO L85 PathProgramCache]: Analyzing trace with hash 942514443, now seen corresponding path program 15 times [2022-11-22 01:56:27,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:27,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412640544] [2022-11-22 01:56:27,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:27,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:27,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:27,405 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:27,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:27,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412640544] [2022-11-22 01:56:27,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412640544] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:27,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83095365] [2022-11-22 01:56:27,406 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:27,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:27,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:27,407 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:27,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-22 01:56:27,462 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:27,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:27,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:27,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:27,945 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:27,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:28,186 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:28,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83095365] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:28,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [569275174] [2022-11-22 01:56:28,187 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:28,188 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:28,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:28,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:28,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:28,271 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:28,771 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20273#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:28,771 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:28,771 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:28,771 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 41 [2022-11-22 01:56:28,771 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874962900] [2022-11-22 01:56:28,771 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:28,772 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-22 01:56:28,772 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:28,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-22 01:56:28,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2074, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:56:28,772 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:29,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:29,396 INFO L93 Difference]: Finished difference Result 116 states and 128 transitions. [2022-11-22 01:56:29,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-22 01:56:29,396 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-22 01:56:29,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:29,397 INFO L225 Difference]: With dead ends: 116 [2022-11-22 01:56:29,397 INFO L226 Difference]: Without dead ends: 86 [2022-11-22 01:56:29,397 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 73 SyntacticMatches, 17 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1985 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=721, Invalid=3835, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 01:56:29,398 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:29,398 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 145 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:29,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-11-22 01:56:29,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 50. [2022-11-22 01:56:29,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:29,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:29,447 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:29,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:29,447 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:29,447 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:29,447 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:29,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:29,448 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:29,448 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:29,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:29,653 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:29,654 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:29,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:29,654 INFO L85 PathProgramCache]: Analyzing trace with hash -1406409700, now seen corresponding path program 22 times [2022-11-22 01:56:29,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:29,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201517389] [2022-11-22 01:56:29,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:29,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:29,948 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:29,948 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:29,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201517389] [2022-11-22 01:56:29,948 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201517389] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:29,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371883712] [2022-11-22 01:56:29,948 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:29,948 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:29,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:29,950 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:29,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-22 01:56:30,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:30,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:30,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:30,517 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:30,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:30,779 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:30,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371883712] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:30,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [676353351] [2022-11-22 01:56:30,780 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:30,780 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:30,780 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:30,780 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:30,780 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:30,869 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:31,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20874#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:31,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:31,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:31,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 40 [2022-11-22 01:56:31,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110554742] [2022-11-22 01:56:31,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:31,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-22 01:56:31,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:31,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-22 01:56:31,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=2013, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 01:56:31,348 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:32,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:32,141 INFO L93 Difference]: Finished difference Result 152 states and 165 transitions. [2022-11-22 01:56:32,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 01:56:32,142 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-22 01:56:32,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:32,143 INFO L225 Difference]: With dead ends: 152 [2022-11-22 01:56:32,143 INFO L226 Difference]: Without dead ends: 122 [2022-11-22 01:56:32,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 74 SyntacticMatches, 17 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2239 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=814, Invalid=4588, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 01:56:32,144 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 52 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:32,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 154 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:32,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-22 01:56:32,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 50. [2022-11-22 01:56:32,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:32,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:32,226 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:32,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:32,226 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:32,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.048780487804878) internal successors, (84), 40 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:32,227 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:32,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:32,227 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:32,227 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:32,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:32,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-11-22 01:56:32,433 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:32,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:32,433 INFO L85 PathProgramCache]: Analyzing trace with hash 180386539, now seen corresponding path program 23 times [2022-11-22 01:56:32,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:32,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246857817] [2022-11-22 01:56:32,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:32,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:32,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:32,711 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:32,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:32,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246857817] [2022-11-22 01:56:32,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [246857817] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:32,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562417216] [2022-11-22 01:56:32,712 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:32,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:32,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:32,713 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:32,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-22 01:56:32,802 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 01:56:32,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:32,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:32,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:33,297 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:33,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:33,558 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:33,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562417216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:33,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [52038246] [2022-11-22 01:56:33,559 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:33,560 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:33,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:33,560 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:33,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:33,654 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:34,136 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21549#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:34,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:34,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:34,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 39 [2022-11-22 01:56:34,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554345671] [2022-11-22 01:56:34,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:34,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 01:56:34,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:34,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 01:56:34,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1938, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:56:34,138 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:35,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:35,082 INFO L93 Difference]: Finished difference Result 187 states and 201 transitions. [2022-11-22 01:56:35,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:56:35,082 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 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 [2022-11-22 01:56:35,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:35,083 INFO L225 Difference]: With dead ends: 187 [2022-11-22 01:56:35,084 INFO L226 Difference]: Without dead ends: 157 [2022-11-22 01:56:35,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 75 SyntacticMatches, 17 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2400 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=900, Invalid=5106, Unknown=0, NotChecked=0, Total=6006 [2022-11-22 01:56:35,084 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 97 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:35,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [97 Valid, 162 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:35,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-11-22 01:56:35,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 50. [2022-11-22 01:56:35,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:35,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:35,139 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:35,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:35,139 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:35,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.075) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:35,139 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:35,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:35,140 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:35,140 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:35,145 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:35,345 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-22 01:56:35,345 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:35,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:35,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1894141500, now seen corresponding path program 24 times [2022-11-22 01:56:35,345 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:35,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481906341] [2022-11-22 01:56:35,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:35,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:35,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:35,642 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:35,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:35,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481906341] [2022-11-22 01:56:35,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [481906341] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:35,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166401840] [2022-11-22 01:56:35,643 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:35,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:35,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:35,644 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:35,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-22 01:56:35,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:35,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:35,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:35,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:36,123 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:36,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:36,348 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:36,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166401840] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:36,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [144280243] [2022-11-22 01:56:36,349 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:36,349 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:36,350 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:36,350 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:36,350 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:36,445 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:36,907 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22292#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:36,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:36,908 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:36,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 38 [2022-11-22 01:56:36,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452107999] [2022-11-22 01:56:36,908 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:36,908 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-22 01:56:36,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:36,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-22 01:56:36,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=301, Invalid=1861, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 01:56:36,909 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:37,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:37,965 INFO L93 Difference]: Finished difference Result 221 states and 236 transitions. [2022-11-22 01:56:37,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 01:56:37,965 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 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 [2022-11-22 01:56:37,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:37,966 INFO L225 Difference]: With dead ends: 221 [2022-11-22 01:56:37,966 INFO L226 Difference]: Without dead ends: 191 [2022-11-22 01:56:37,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 76 SyntacticMatches, 17 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2458 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 01:56:37,967 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 115 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 281 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 115 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:37,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [115 Valid, 184 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 281 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:56:37,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-22 01:56:38,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 50. [2022-11-22 01:56:38,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:38,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:38,030 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:38,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:38,030 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:38,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.1025641025641026) internal successors, (82), 38 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:38,031 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:38,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:38,031 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:38,031 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:38,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:38,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:38,237 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:38,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:38,237 INFO L85 PathProgramCache]: Analyzing trace with hash -1375712053, now seen corresponding path program 25 times [2022-11-22 01:56:38,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:38,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151481356] [2022-11-22 01:56:38,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:38,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:38,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:38,492 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 78 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:38,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:38,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151481356] [2022-11-22 01:56:38,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151481356] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:38,493 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816740150] [2022-11-22 01:56:38,493 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:38,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:38,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:38,494 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:38,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-22 01:56:38,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:38,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:38,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:38,961 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:38,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:39,182 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 100 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:39,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816740150] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:39,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [854467184] [2022-11-22 01:56:39,183 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:39,183 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:39,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:39,183 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:39,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:39,279 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:39,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23097#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:39,766 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:39,766 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:39,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 37 [2022-11-22 01:56:39,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529304333] [2022-11-22 01:56:39,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:39,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 01:56:39,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:39,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 01:56:39,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1782, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:56:39,768 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:40,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:40,900 INFO L93 Difference]: Finished difference Result 254 states and 270 transitions. [2022-11-22 01:56:40,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 01:56:40,900 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 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 [2022-11-22 01:56:40,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:40,901 INFO L225 Difference]: With dead ends: 254 [2022-11-22 01:56:40,901 INFO L226 Difference]: Without dead ends: 224 [2022-11-22 01:56:40,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 77 SyntacticMatches, 17 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2407 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=946, Invalid=5374, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 01:56:40,903 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 171 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:40,903 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 163 Invalid, 280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:40,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2022-11-22 01:56:40,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 50. [2022-11-22 01:56:40,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:40,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:40,981 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:40,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:40,981 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:40,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:40,982 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:40,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:40,982 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:40,982 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:40,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:41,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-22 01:56:41,187 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:41,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:41,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1619738532, now seen corresponding path program 26 times [2022-11-22 01:56:41,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:41,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439126212] [2022-11-22 01:56:41,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:41,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:41,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:41,466 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 78 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:41,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:41,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439126212] [2022-11-22 01:56:41,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439126212] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:41,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270431455] [2022-11-22 01:56:41,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:41,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:41,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:41,468 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:41,486 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-22 01:56:41,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 01:56:41,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:41,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:41,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:41,965 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:41,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:42,204 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 100 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:42,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270431455] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:42,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1482554412] [2022-11-22 01:56:42,205 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:42,205 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:42,205 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:42,205 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:42,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:42,311 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:42,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23958#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:42,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:42,776 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:42,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 36 [2022-11-22 01:56:42,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876632617] [2022-11-22 01:56:42,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:42,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 01:56:42,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:42,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 01:56:42,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 01:56:42,777 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:43,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:43,980 INFO L93 Difference]: Finished difference Result 286 states and 303 transitions. [2022-11-22 01:56:43,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 01:56:43,981 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 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 [2022-11-22 01:56:43,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:43,982 INFO L225 Difference]: With dead ends: 286 [2022-11-22 01:56:43,982 INFO L226 Difference]: Without dead ends: 256 [2022-11-22 01:56:43,983 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 78 SyntacticMatches, 17 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2244 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=900, Invalid=5106, Unknown=0, NotChecked=0, Total=6006 [2022-11-22 01:56:43,983 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 125 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 364 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 389 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 364 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:43,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 239 Invalid, 389 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 364 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:56:43,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-11-22 01:56:44,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 50. [2022-11-22 01:56:44,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:44,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:44,070 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:44,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:44,070 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:44,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.1621621621621623) internal successors, (80), 36 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:44,071 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:44,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:44,071 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:44,071 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:44,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:44,276 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-22 01:56:44,276 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:44,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:44,276 INFO L85 PathProgramCache]: Analyzing trace with hash -657779029, now seen corresponding path program 27 times [2022-11-22 01:56:44,276 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:44,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007732775] [2022-11-22 01:56:44,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:44,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:44,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:44,546 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 78 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:44,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:44,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007732775] [2022-11-22 01:56:44,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007732775] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:44,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188453716] [2022-11-22 01:56:44,547 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:56:44,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:44,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:44,548 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:44,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-22 01:56:44,607 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:56:44,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:44,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:44,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:45,034 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:45,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:45,272 INFO L134 CoverageAnalysis]: Checked inductivity of 124 backedges. 100 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:45,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188453716] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:45,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1994142501] [2022-11-22 01:56:45,273 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:45,273 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:45,273 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:45,273 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:45,274 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:45,367 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:45,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24869#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:45,860 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:45,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:45,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 35 [2022-11-22 01:56:45,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168916645] [2022-11-22 01:56:45,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:45,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-22 01:56:45,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:45,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-22 01:56:45,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=1618, Unknown=0, NotChecked=0, Total=1892 [2022-11-22 01:56:45,862 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 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) [2022-11-22 01:56:47,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:47,064 INFO L93 Difference]: Finished difference Result 317 states and 335 transitions. [2022-11-22 01:56:47,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 01:56:47,064 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 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 40 [2022-11-22 01:56:47,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:47,065 INFO L225 Difference]: With dead ends: 317 [2022-11-22 01:56:47,065 INFO L226 Difference]: Without dead ends: 287 [2022-11-22 01:56:47,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 79 SyntacticMatches, 17 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1978 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=814, Invalid=4588, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 01:56:47,066 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 171 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:47,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 168 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:47,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2022-11-22 01:56:47,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 50. [2022-11-22 01:56:47,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:47,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:47,157 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:47,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:47,158 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:47,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.1944444444444446) internal successors, (79), 35 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) [2022-11-22 01:56:47,158 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:47,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:47,159 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:47,159 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:47,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:47,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:47,364 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:47,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:47,364 INFO L85 PathProgramCache]: Analyzing trace with hash 758725244, now seen corresponding path program 28 times [2022-11-22 01:56:47,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:47,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024356793] [2022-11-22 01:56:47,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:47,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:47,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:47,606 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 78 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:47,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:47,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024356793] [2022-11-22 01:56:47,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024356793] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:47,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054166760] [2022-11-22 01:56:47,607 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:47,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:47,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:47,608 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:47,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-22 01:56:47,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:47,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:47,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:48,040 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:48,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:48,259 INFO L134 CoverageAnalysis]: Checked inductivity of 129 backedges. 100 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:48,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054166760] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:48,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016939204] [2022-11-22 01:56:48,260 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:48,260 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:48,261 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:48,261 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:48,261 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:48,355 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:48,819 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25824#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:48,819 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:48,819 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:48,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2022-11-22 01:56:48,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633245672] [2022-11-22 01:56:48,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:48,820 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-22 01:56:48,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:48,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-22 01:56:48,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=273, Invalid=1533, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 01:56:48,823 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:49,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:49,935 INFO L93 Difference]: Finished difference Result 347 states and 366 transitions. [2022-11-22 01:56:49,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:56:49,935 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 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 [2022-11-22 01:56:49,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:49,935 INFO L225 Difference]: With dead ends: 347 [2022-11-22 01:56:49,935 INFO L226 Difference]: Without dead ends: 317 [2022-11-22 01:56:49,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 80 SyntacticMatches, 17 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1612 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=700, Invalid=3856, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 01:56:49,936 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 172 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 172 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 301 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:49,937 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [172 Valid, 185 Invalid, 301 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:49,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-11-22 01:56:50,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 50. [2022-11-22 01:56:50,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.2244897959183674) internal successors, (60), 49 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) [2022-11-22 01:56:50,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2022-11-22 01:56:50,000 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 40 [2022-11-22 01:56:50,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:50,000 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2022-11-22 01:56:50,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 34 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:50,000 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2022-11-22 01:56:50,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-22 01:56:50,001 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:50,001 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:50,005 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:50,202 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:50,203 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:50,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:50,203 INFO L85 PathProgramCache]: Analyzing trace with hash 1635702923, now seen corresponding path program 8 times [2022-11-22 01:56:50,203 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:50,203 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371907642] [2022-11-22 01:56:50,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:50,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:50,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:50,440 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 78 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:50,440 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:50,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371907642] [2022-11-22 01:56:50,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371907642] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:50,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278049471] [2022-11-22 01:56:50,441 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:50,441 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:50,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:50,442 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:50,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-22 01:56:50,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-22 01:56:50,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:50,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 22 conjunts are in the unsatisfiable core [2022-11-22 01:56:50,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:50,842 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:50,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:51,077 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 100 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:51,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278049471] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:51,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1580558032] [2022-11-22 01:56:51,078 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:51,078 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:51,078 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:51,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:51,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:51,168 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:51,669 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26817#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:51,669 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:51,669 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:51,669 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 33 [2022-11-22 01:56:51,669 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637312452] [2022-11-22 01:56:51,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:51,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-22 01:56:51,670 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:51,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-22 01:56:51,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=1447, Unknown=0, NotChecked=0, Total=1722 [2022-11-22 01:56:51,670 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 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) [2022-11-22 01:56:52,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:52,722 INFO L93 Difference]: Finished difference Result 378 states and 399 transitions. [2022-11-22 01:56:52,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 01:56:52,722 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-11-22 01:56:52,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:52,724 INFO L225 Difference]: With dead ends: 378 [2022-11-22 01:56:52,724 INFO L226 Difference]: Without dead ends: 348 [2022-11-22 01:56:52,724 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 81 SyntacticMatches, 17 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=584, Invalid=2956, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:56:52,725 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 242 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 242 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:52,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [242 Valid, 145 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:52,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2022-11-22 01:56:52,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 51. [2022-11-22 01:56:52,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:52,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 62 transitions. [2022-11-22 01:56:52,803 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 62 transitions. Word has length 40 [2022-11-22 01:56:52,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:52,803 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 62 transitions. [2022-11-22 01:56:52,803 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.235294117647059) internal successors, (76), 33 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) [2022-11-22 01:56:52,803 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 62 transitions. [2022-11-22 01:56:52,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-22 01:56:52,804 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:52,804 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:52,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:53,004 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-11-22 01:56:53,004 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:53,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:53,005 INFO L85 PathProgramCache]: Analyzing trace with hash -1032519537, now seen corresponding path program 16 times [2022-11-22 01:56:53,005 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:53,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238750073] [2022-11-22 01:56:53,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:53,005 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:53,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:53,157 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:53,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:53,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238750073] [2022-11-22 01:56:53,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238750073] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:53,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902391461] [2022-11-22 01:56:53,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:56:53,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:53,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:53,159 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:53,178 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-22 01:56:53,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:53,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:56:53,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:53,291 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:53,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:53,430 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 45 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:53,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902391461] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:53,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [181872914] [2022-11-22 01:56:53,432 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:53,432 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:53,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:53,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:53,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:53,513 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:53,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27835#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:53,882 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:53,883 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:53,883 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 13 [2022-11-22 01:56:53,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190913073] [2022-11-22 01:56:53,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:53,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-22 01:56:53,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:53,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-22 01:56:53,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2022-11-22 01:56:53,884 INFO L87 Difference]: Start difference. First operand 51 states and 62 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:54,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:54,228 INFO L93 Difference]: Finished difference Result 62 states and 73 transitions. [2022-11-22 01:56:54,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-22 01:56:54,228 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-11-22 01:56:54,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:54,229 INFO L225 Difference]: With dead ends: 62 [2022-11-22 01:56:54,229 INFO L226 Difference]: Without dead ends: 60 [2022-11-22 01:56:54,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 103 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=261, Invalid=795, Unknown=0, NotChecked=0, Total=1056 [2022-11-22 01:56:54,229 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 72 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:54,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 26 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:54,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-22 01:56:54,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2022-11-22 01:56:54,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:54,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-11-22 01:56:54,293 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 41 [2022-11-22 01:56:54,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:54,293 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-11-22 01:56:54,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:54,293 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-11-22 01:56:54,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:56:54,294 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:54,294 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:54,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-11-22 01:56:54,494 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2022-11-22 01:56:54,494 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:54,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:54,495 INFO L85 PathProgramCache]: Analyzing trace with hash 771090305, now seen corresponding path program 17 times [2022-11-22 01:56:54,495 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:54,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484845268] [2022-11-22 01:56:54,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:54,495 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:54,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:54,790 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:54,790 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:54,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484845268] [2022-11-22 01:56:54,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484845268] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:54,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268763261] [2022-11-22 01:56:54,791 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:54,791 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:54,791 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:54,792 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:54,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-22 01:56:54,852 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-22 01:56:54,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:54,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:56:54,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:55,407 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:55,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:55,683 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:55,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268763261] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:55,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605959432] [2022-11-22 01:56:55,684 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:55,684 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:55,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:55,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:55,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:55,758 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:56,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28366#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:56,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:56,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:56,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 45 [2022-11-22 01:56:56,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127664546] [2022-11-22 01:56:56,283 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:56,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 01:56:56,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:56,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 01:56:56,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=2420, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 01:56:56,284 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:57,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:56:57,026 INFO L93 Difference]: Finished difference Result 128 states and 141 transitions. [2022-11-22 01:56:57,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-22 01:56:57,027 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:56:57,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:56:57,027 INFO L225 Difference]: With dead ends: 128 [2022-11-22 01:56:57,027 INFO L226 Difference]: Without dead ends: 95 [2022-11-22 01:56:57,028 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 81 SyntacticMatches, 19 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2396 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=855, Invalid=4547, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 01:56:57,028 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 51 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:56:57,028 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 154 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:56:57,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-22 01:56:57,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 55. [2022-11-22 01:56:57,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:57,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:56:57,121 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:56:57,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:56:57,121 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:56:57,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:56:57,121 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:56:57,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:56:57,122 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:56:57,122 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:56:57,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-22 01:56:57,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:57,322 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:56:57,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:56:57,323 INFO L85 PathProgramCache]: Analyzing trace with hash 604650002, now seen corresponding path program 29 times [2022-11-22 01:56:57,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:56:57,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080533391] [2022-11-22 01:56:57,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:56:57,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:56:57,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:56:57,608 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:57,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:56:57,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080533391] [2022-11-22 01:56:57,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080533391] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:56:57,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788185738] [2022-11-22 01:56:57,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:56:57,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:56:57,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:56:57,609 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:56:57,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-22 01:56:57,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-22 01:56:57,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:56:57,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:56:57,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:56:58,212 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:58,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:56:58,521 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:56:58,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788185738] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:56:58,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754572357] [2022-11-22 01:56:58,522 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:56:58,522 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:56:58,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:56:58,522 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:56:58,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:56:58,632 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:56:59,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29029#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:56:59,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:56:59,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:56:59,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 44 [2022-11-22 01:56:59,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032508517] [2022-11-22 01:56:59,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:56:59,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-22 01:56:59,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:56:59,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-22 01:56:59,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2354, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 01:56:59,127 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:00,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:00,146 INFO L93 Difference]: Finished difference Result 168 states and 182 transitions. [2022-11-22 01:57:00,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 01:57:00,146 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:00,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:00,147 INFO L225 Difference]: With dead ends: 168 [2022-11-22 01:57:00,147 INFO L226 Difference]: Without dead ends: 135 [2022-11-22 01:57:00,148 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 82 SyntacticMatches, 19 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2730 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=980, Invalid=5500, Unknown=0, NotChecked=0, Total=6480 [2022-11-22 01:57:00,148 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 71 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:00,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 183 Invalid, 334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:00,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-22 01:57:00,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 55. [2022-11-22 01:57:00,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:00,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:00,227 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:00,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:00,227 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:00,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.0444444444444443) internal successors, (92), 44 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:00,228 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:00,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:00,228 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:00,228 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:00,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:00,434 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:00,434 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:00,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:00,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1707659617, now seen corresponding path program 30 times [2022-11-22 01:57:00,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:00,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039320500] [2022-11-22 01:57:00,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:00,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:00,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:00,741 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:00,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:00,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039320500] [2022-11-22 01:57:00,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039320500] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:00,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039393298] [2022-11-22 01:57:00,742 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:00,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:00,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:00,743 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:00,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-22 01:57:00,807 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:00,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:00,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:00,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:01,332 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:01,333 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:01,599 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:01,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039393298] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:01,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [405009487] [2022-11-22 01:57:01,600 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:01,600 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:01,600 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:01,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:01,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:01,703 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:02,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29775#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:02,187 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:02,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:02,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 43 [2022-11-22 01:57:02,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263892872] [2022-11-22 01:57:02,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:02,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 01:57:02,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:02,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 01:57:02,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=2274, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 01:57:02,188 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:03,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:03,379 INFO L93 Difference]: Finished difference Result 207 states and 222 transitions. [2022-11-22 01:57:03,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 01:57:03,379 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:03,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:03,380 INFO L225 Difference]: With dead ends: 207 [2022-11-22 01:57:03,380 INFO L226 Difference]: Without dead ends: 174 [2022-11-22 01:57:03,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 83 SyntacticMatches, 19 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2969 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1100, Invalid=6210, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 01:57:03,380 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 61 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:03,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 200 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:03,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-22 01:57:03,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 55. [2022-11-22 01:57:03,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:03,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:03,469 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:03,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:03,469 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:03,469 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.0681818181818183) internal successors, (91), 43 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:03,469 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:03,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:03,469 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:03,469 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:03,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:03,670 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-11-22 01:57:03,670 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:03,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:03,670 INFO L85 PathProgramCache]: Analyzing trace with hash -750611406, now seen corresponding path program 31 times [2022-11-22 01:57:03,670 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:03,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1271728470] [2022-11-22 01:57:03,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:03,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:03,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:03,935 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:03,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:03,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1271728470] [2022-11-22 01:57:03,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1271728470] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:03,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354537070] [2022-11-22 01:57:03,935 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:03,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:03,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:03,936 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:03,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-22 01:57:03,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:03,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:03,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:04,510 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:04,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:04,782 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:04,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354537070] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:04,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [933850857] [2022-11-22 01:57:04,783 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:04,783 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:04,783 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:04,784 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:04,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:04,866 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:05,352 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30598#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:05,352 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:05,352 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:05,352 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 42 [2022-11-22 01:57:05,352 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192427343] [2022-11-22 01:57:05,352 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:05,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-22 01:57:05,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:05,353 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-22 01:57:05,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2192, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 01:57:05,354 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 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) [2022-11-22 01:57:06,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:06,761 INFO L93 Difference]: Finished difference Result 245 states and 261 transitions. [2022-11-22 01:57:06,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 01:57:06,762 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 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 44 [2022-11-22 01:57:06,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:06,763 INFO L225 Difference]: With dead ends: 245 [2022-11-22 01:57:06,763 INFO L226 Difference]: Without dead ends: 212 [2022-11-22 01:57:06,764 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 84 SyntacticMatches, 19 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3099 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1178, Invalid=6654, Unknown=0, NotChecked=0, Total=7832 [2022-11-22 01:57:06,764 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 127 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 364 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:06,764 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 199 Invalid, 364 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:06,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-11-22 01:57:06,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 55. [2022-11-22 01:57:06,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:06,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:06,871 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:06,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:06,871 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:06,872 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0930232558139537) internal successors, (90), 42 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) [2022-11-22 01:57:06,872 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:06,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:06,872 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:06,872 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:06,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2022-11-22 01:57:07,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-22 01:57:07,075 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:07,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:07,075 INFO L85 PathProgramCache]: Analyzing trace with hash -552815807, now seen corresponding path program 32 times [2022-11-22 01:57:07,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:07,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132448954] [2022-11-22 01:57:07,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:07,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:07,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:07,344 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:07,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:07,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132448954] [2022-11-22 01:57:07,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132448954] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:07,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101400599] [2022-11-22 01:57:07,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:57:07,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:07,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:07,345 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:07,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-11-22 01:57:07,404 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-22 01:57:07,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:07,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:07,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:07,888 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:07,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:08,147 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:08,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101400599] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:08,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1154323540] [2022-11-22 01:57:08,148 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:08,148 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:08,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:08,149 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:08,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:08,241 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:08,722 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31492#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:08,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:08,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:08,722 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 41 [2022-11-22 01:57:08,722 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494244572] [2022-11-22 01:57:08,722 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:08,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-22 01:57:08,723 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:08,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-22 01:57:08,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=2108, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:57:08,723 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:10,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:10,177 INFO L93 Difference]: Finished difference Result 282 states and 299 transitions. [2022-11-22 01:57:10,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 01:57:10,177 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:10,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:10,178 INFO L225 Difference]: With dead ends: 282 [2022-11-22 01:57:10,178 INFO L226 Difference]: Without dead ends: 249 [2022-11-22 01:57:10,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 85 SyntacticMatches, 19 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3109 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1205, Invalid=6805, Unknown=0, NotChecked=0, Total=8010 [2022-11-22 01:57:10,179 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 150 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:10,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 141 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:10,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2022-11-22 01:57:10,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 55. [2022-11-22 01:57:10,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:10,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:10,274 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:10,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:10,275 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:10,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.119047619047619) internal successors, (89), 41 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:10,275 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:10,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:10,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:10,275 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:10,279 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2022-11-22 01:57:10,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:10,476 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:10,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:10,476 INFO L85 PathProgramCache]: Analyzing trace with hash 1393227346, now seen corresponding path program 33 times [2022-11-22 01:57:10,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:10,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503369766] [2022-11-22 01:57:10,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:10,476 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:10,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:10,739 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 101 proven. 50 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:10,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:10,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503369766] [2022-11-22 01:57:10,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503369766] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:10,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138880950] [2022-11-22 01:57:10,740 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:10,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:10,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:10,741 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:10,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-11-22 01:57:10,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:10,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:10,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:10,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:11,254 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:11,254 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:11,518 INFO L134 CoverageAnalysis]: Checked inductivity of 151 backedges. 126 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:11,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138880950] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:11,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1636805166] [2022-11-22 01:57:11,519 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:11,519 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:11,519 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:11,519 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:11,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:11,611 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:12,100 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32451#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:12,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:12,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:12,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 40 [2022-11-22 01:57:12,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005317419] [2022-11-22 01:57:12,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:12,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-22 01:57:12,101 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:12,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-22 01:57:12,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=2022, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 01:57:12,102 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:13,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:13,668 INFO L93 Difference]: Finished difference Result 318 states and 336 transitions. [2022-11-22 01:57:13,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-22 01:57:13,669 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:13,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:13,670 INFO L225 Difference]: With dead ends: 318 [2022-11-22 01:57:13,670 INFO L226 Difference]: Without dead ends: 285 [2022-11-22 01:57:13,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 86 SyntacticMatches, 19 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2990 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1178, Invalid=6654, Unknown=0, NotChecked=0, Total=7832 [2022-11-22 01:57:13,671 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 186 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:13,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 147 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:13,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2022-11-22 01:57:13,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 55. [2022-11-22 01:57:13,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:13,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:13,781 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:13,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:13,781 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:13,781 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 40 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:13,782 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:13,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:13,782 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:13,782 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:13,786 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Ended with exit code 0 [2022-11-22 01:57:13,982 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-22 01:57:13,982 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:13,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:13,983 INFO L85 PathProgramCache]: Analyzing trace with hash -1314943711, now seen corresponding path program 34 times [2022-11-22 01:57:13,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:13,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619730550] [2022-11-22 01:57:13,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:13,983 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:13,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:14,254 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 101 proven. 52 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:14,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:14,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619730550] [2022-11-22 01:57:14,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619730550] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:14,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237670261] [2022-11-22 01:57:14,254 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:14,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:14,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:14,255 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:14,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-11-22 01:57:14,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:14,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:14,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:14,778 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:14,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 126 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:15,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237670261] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:15,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368474435] [2022-11-22 01:57:15,036 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:15,037 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:15,037 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:15,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:15,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:15,133 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:15,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33469#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:15,617 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:15,617 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:15,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2022-11-22 01:57:15,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505572667] [2022-11-22 01:57:15,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:15,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 01:57:15,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:15,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 01:57:15,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=1934, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:57:15,619 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:17,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:17,179 INFO L93 Difference]: Finished difference Result 353 states and 372 transitions. [2022-11-22 01:57:17,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 01:57:17,180 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:17,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:17,180 INFO L225 Difference]: With dead ends: 353 [2022-11-22 01:57:17,180 INFO L226 Difference]: Without dead ends: 320 [2022-11-22 01:57:17,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 87 SyntacticMatches, 19 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2745 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1100, Invalid=6210, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 01:57:17,181 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 216 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:17,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 167 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:17,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2022-11-22 01:57:17,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 55. [2022-11-22 01:57:17,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:17,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:17,278 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:17,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:17,278 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:17,278 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.175) internal successors, (87), 39 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:17,278 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:17,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:17,278 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:17,278 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:17,282 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-11-22 01:57:17,479 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:17,479 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:17,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:17,479 INFO L85 PathProgramCache]: Analyzing trace with hash 398811250, now seen corresponding path program 35 times [2022-11-22 01:57:17,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:17,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249041650] [2022-11-22 01:57:17,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:17,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:17,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:17,744 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 101 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:17,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:17,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249041650] [2022-11-22 01:57:17,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249041650] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:17,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128705356] [2022-11-22 01:57:17,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:57:17,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:17,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:17,751 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:17,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-11-22 01:57:17,813 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-22 01:57:17,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:17,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:17,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:18,300 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:18,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:18,556 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 126 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:18,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128705356] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:18,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1346230173] [2022-11-22 01:57:18,557 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:18,557 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:18,557 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:18,557 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:18,557 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:18,646 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:19,121 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34540#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:19,121 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:19,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:19,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 38 [2022-11-22 01:57:19,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495083007] [2022-11-22 01:57:19,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:19,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-22 01:57:19,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:19,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-22 01:57:19,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1844, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 01:57:19,123 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:20,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:20,687 INFO L93 Difference]: Finished difference Result 387 states and 407 transitions. [2022-11-22 01:57:20,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 01:57:20,688 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:20,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:20,689 INFO L225 Difference]: With dead ends: 387 [2022-11-22 01:57:20,689 INFO L226 Difference]: Without dead ends: 354 [2022-11-22 01:57:20,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 88 SyntacticMatches, 19 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2389 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=980, Invalid=5500, Unknown=0, NotChecked=0, Total=6480 [2022-11-22 01:57:20,690 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 233 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:20,690 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 184 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:20,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2022-11-22 01:57:20,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 55. [2022-11-22 01:57:20,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:20,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:20,847 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:20,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:20,848 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:20,848 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:20,848 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:20,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:20,848 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:20,848 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:20,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:21,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:21,049 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:21,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:21,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1423924993, now seen corresponding path program 36 times [2022-11-22 01:57:21,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:21,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560247418] [2022-11-22 01:57:21,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:21,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:21,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:21,308 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 101 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:21,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:21,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560247418] [2022-11-22 01:57:21,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560247418] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:21,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734804527] [2022-11-22 01:57:21,308 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:21,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:21,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:21,315 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:21,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-11-22 01:57:21,374 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:21,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:21,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:21,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:21,784 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:21,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:22,038 INFO L134 CoverageAnalysis]: Checked inductivity of 163 backedges. 126 proven. 37 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:22,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734804527] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:22,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1684142314] [2022-11-22 01:57:22,039 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:22,039 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:22,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:22,039 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:22,039 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:22,125 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:22,616 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35658#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:22,616 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:22,616 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:22,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 37 [2022-11-22 01:57:22,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712144583] [2022-11-22 01:57:22,616 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:22,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-22 01:57:22,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:22,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-22 01:57:22,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=1752, Unknown=0, NotChecked=0, Total=2070 [2022-11-22 01:57:22,617 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) [2022-11-22 01:57:24,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:24,156 INFO L93 Difference]: Finished difference Result 420 states and 441 transitions. [2022-11-22 01:57:24,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-22 01:57:24,156 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) Word has length 44 [2022-11-22 01:57:24,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:24,157 INFO L225 Difference]: With dead ends: 420 [2022-11-22 01:57:24,157 INFO L226 Difference]: Without dead ends: 387 [2022-11-22 01:57:24,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 89 SyntacticMatches, 19 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1929 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=833, Invalid=4569, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 01:57:24,158 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 200 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:24,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 163 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:24,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-11-22 01:57:24,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 55. [2022-11-22 01:57:24,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:24,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2022-11-22 01:57:24,255 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 44 [2022-11-22 01:57:24,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:24,256 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2022-11-22 01:57:24,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.236842105263158) internal successors, (85), 37 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) [2022-11-22 01:57:24,256 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2022-11-22 01:57:24,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-22 01:57:24,256 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:24,256 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:24,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:24,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:24,458 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:24,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:24,459 INFO L85 PathProgramCache]: Analyzing trace with hash 1179898514, now seen corresponding path program 9 times [2022-11-22 01:57:24,459 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:24,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140629555] [2022-11-22 01:57:24,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:24,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:24,732 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 101 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:24,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:24,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140629555] [2022-11-22 01:57:24,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140629555] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:24,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057263049] [2022-11-22 01:57:24,733 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:24,733 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:24,733 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:24,734 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:24,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-11-22 01:57:24,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:24,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:24,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-22 01:57:24,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:25,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:25,443 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 126 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:25,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057263049] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:25,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059066932] [2022-11-22 01:57:25,444 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:25,444 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:25,444 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:25,445 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:25,445 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:25,520 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:26,022 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36817#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:26,022 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:26,022 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:26,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 36 [2022-11-22 01:57:26,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829749742] [2022-11-22 01:57:26,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:26,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-22 01:57:26,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:26,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-22 01:57:26,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1659, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 01:57:26,024 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:27,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:27,445 INFO L93 Difference]: Finished difference Result 454 states and 477 transitions. [2022-11-22 01:57:27,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 01:57:27,446 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-11-22 01:57:27,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:27,447 INFO L225 Difference]: With dead ends: 454 [2022-11-22 01:57:27,447 INFO L226 Difference]: Without dead ends: 421 [2022-11-22 01:57:27,447 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 90 SyntacticMatches, 19 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1443 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=689, Invalid=3471, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 01:57:27,447 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 213 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:27,448 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 145 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 232 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:27,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2022-11-22 01:57:27,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 56. [2022-11-22 01:57:27,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2363636363636363) internal successors, (68), 55 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) [2022-11-22 01:57:27,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2022-11-22 01:57:27,551 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 44 [2022-11-22 01:57:27,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:27,551 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2022-11-22 01:57:27,551 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.2432432432432434) internal successors, (83), 36 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:27,552 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2022-11-22 01:57:27,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-22 01:57:27,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:27,552 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:27,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2022-11-22 01:57:27,752 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-11-22 01:57:27,753 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:27,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:27,753 INFO L85 PathProgramCache]: Analyzing trace with hash 2126112005, now seen corresponding path program 18 times [2022-11-22 01:57:27,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:27,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344952772] [2022-11-22 01:57:27,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:27,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:27,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:27,963 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:27,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:27,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344952772] [2022-11-22 01:57:27,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344952772] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:27,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883244256] [2022-11-22 01:57:27,965 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:27,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:27,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:27,971 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:27,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-11-22 01:57:28,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:28,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:28,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:28,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:28,127 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:28,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 55 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:28,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883244256] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:28,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1581739641] [2022-11-22 01:57:28,314 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:28,314 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:28,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:28,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:28,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:28,398 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:28,776 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38002#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:28,776 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:28,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:28,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 14 [2022-11-22 01:57:28,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759103147] [2022-11-22 01:57:28,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:28,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-22 01:57:28,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:28,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-22 01:57:28,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2022-11-22 01:57:28,778 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:29,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:29,213 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2022-11-22 01:57:29,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-22 01:57:29,213 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 45 [2022-11-22 01:57:29,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:29,214 INFO L225 Difference]: With dead ends: 67 [2022-11-22 01:57:29,214 INFO L226 Difference]: Without dead ends: 65 [2022-11-22 01:57:29,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 114 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=299, Invalid=891, Unknown=0, NotChecked=0, Total=1190 [2022-11-22 01:57:29,215 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 59 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:29,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 26 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:29,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-11-22 01:57:29,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2022-11-22 01:57:29,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 58 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:29,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 71 transitions. [2022-11-22 01:57:29,344 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 71 transitions. Word has length 45 [2022-11-22 01:57:29,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:29,345 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 71 transitions. [2022-11-22 01:57:29,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.1333333333333333) internal successors, (47), 14 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:29,345 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 71 transitions. [2022-11-22 01:57:29,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:29,345 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:29,345 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:29,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Ended with exit code 0 [2022-11-22 01:57:29,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2022-11-22 01:57:29,546 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:29,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:29,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1124869963, now seen corresponding path program 19 times [2022-11-22 01:57:29,546 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:29,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [371737204] [2022-11-22 01:57:29,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:29,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:29,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:29,937 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:29,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:29,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [371737204] [2022-11-22 01:57:29,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [371737204] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:29,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105848971] [2022-11-22 01:57:29,938 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:29,938 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:29,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:29,939 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:29,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-11-22 01:57:30,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:30,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:30,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:30,674 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:30,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:30,991 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:30,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105848971] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:30,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1719573433] [2022-11-22 01:57:30,993 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:30,993 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:30,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:30,993 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:30,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:31,069 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:31,609 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38581#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:31,610 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:31,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:31,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 49 [2022-11-22 01:57:31,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82815264] [2022-11-22 01:57:31,610 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:31,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 01:57:31,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:31,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 01:57:31,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=2792, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 01:57:31,611 INFO L87 Difference]: Start difference. First operand 59 states and 71 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 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) [2022-11-22 01:57:32,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:32,534 INFO L93 Difference]: Finished difference Result 140 states and 154 transitions. [2022-11-22 01:57:32,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-22 01:57:32,534 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 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 48 [2022-11-22 01:57:32,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:32,534 INFO L225 Difference]: With dead ends: 140 [2022-11-22 01:57:32,535 INFO L226 Difference]: Without dead ends: 104 [2022-11-22 01:57:32,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 89 SyntacticMatches, 21 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2845 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1001, Invalid=5319, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 01:57:32,535 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 37 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 304 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 304 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:32,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 163 Invalid, 310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 304 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:57:32,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-22 01:57:32,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 60. [2022-11-22 01:57:32,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:32,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:32,653 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:32,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:32,653 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:32,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 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) [2022-11-22 01:57:32,653 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:32,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:32,654 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:32,654 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:32,658 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:32,854 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:32,854 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:32,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:32,855 INFO L85 PathProgramCache]: Analyzing trace with hash -1700607652, now seen corresponding path program 37 times [2022-11-22 01:57:32,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:32,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270342192] [2022-11-22 01:57:32,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:32,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:32,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:33,208 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 127 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:33,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:33,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270342192] [2022-11-22 01:57:33,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270342192] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:33,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96052351] [2022-11-22 01:57:33,209 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:33,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:33,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:33,210 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:33,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-11-22 01:57:33,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:33,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:33,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:33,910 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:33,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:34,221 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:34,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [96052351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:34,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1736112830] [2022-11-22 01:57:34,222 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:34,223 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:34,223 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:34,223 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:34,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:34,319 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:34,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39306#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:34,845 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:34,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:34,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-11-22 01:57:34,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107775320] [2022-11-22 01:57:34,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:34,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 01:57:34,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:34,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 01:57:34,847 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=2721, Unknown=0, NotChecked=0, Total=3192 [2022-11-22 01:57:34,847 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 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) [2022-11-22 01:57:36,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:36,078 INFO L93 Difference]: Finished difference Result 184 states and 199 transitions. [2022-11-22 01:57:36,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:57:36,079 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 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 48 [2022-11-22 01:57:36,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:36,079 INFO L225 Difference]: With dead ends: 184 [2022-11-22 01:57:36,079 INFO L226 Difference]: Without dead ends: 148 [2022-11-22 01:57:36,080 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 90 SyntacticMatches, 21 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3269 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1162, Invalid=6494, Unknown=0, NotChecked=0, Total=7656 [2022-11-22 01:57:36,080 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 74 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:36,080 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 172 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 311 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:36,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-11-22 01:57:36,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 60. [2022-11-22 01:57:36,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:36,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:36,203 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:36,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:36,203 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:36,203 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0408163265306123) internal successors, (100), 48 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) [2022-11-22 01:57:36,203 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:36,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:36,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:36,204 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:36,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:36,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:36,406 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:36,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:36,407 INFO L85 PathProgramCache]: Analyzing trace with hash 563552555, now seen corresponding path program 38 times [2022-11-22 01:57:36,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:36,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633642966] [2022-11-22 01:57:36,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:36,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:36,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:36,721 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 127 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:36,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:36,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633642966] [2022-11-22 01:57:36,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633642966] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:36,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173762809] [2022-11-22 01:57:36,722 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:57:36,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:36,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:36,723 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:36,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-11-22 01:57:36,788 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-22 01:57:36,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:36,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:36,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:37,397 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:37,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:37,705 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:37,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173762809] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:37,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [733960474] [2022-11-22 01:57:37,706 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:37,707 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:37,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:37,707 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:37,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:37,790 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:38,303 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40123#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:38,303 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:38,303 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:38,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-11-22 01:57:38,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452043423] [2022-11-22 01:57:38,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:38,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 01:57:38,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:38,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 01:57:38,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=2636, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:57:38,304 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:39,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:39,834 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2022-11-22 01:57:39,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-22 01:57:39,835 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:57:39,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:39,836 INFO L225 Difference]: With dead ends: 227 [2022-11-22 01:57:39,836 INFO L226 Difference]: Without dead ends: 191 [2022-11-22 01:57:39,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 91 SyntacticMatches, 21 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3598 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1321, Invalid=7421, Unknown=0, NotChecked=0, Total=8742 [2022-11-22 01:57:39,837 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 64 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:39,837 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 224 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 376 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:39,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-22 01:57:40,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 60. [2022-11-22 01:57:40,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:40,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:40,051 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:40,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:40,052 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:40,052 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0625) internal successors, (99), 47 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:40,052 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:40,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:40,052 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:40,052 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:40,064 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:40,258 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-11-22 01:57:40,258 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:40,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:40,258 INFO L85 PathProgramCache]: Analyzing trace with hash -471788676, now seen corresponding path program 39 times [2022-11-22 01:57:40,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:40,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305877444] [2022-11-22 01:57:40,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:40,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:40,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:40,564 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 127 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:40,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:40,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305877444] [2022-11-22 01:57:40,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305877444] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:40,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813976784] [2022-11-22 01:57:40,565 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:40,565 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:40,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:40,566 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:40,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-11-22 01:57:40,623 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:40,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:40,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:40,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:41,216 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:41,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:41,546 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:41,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813976784] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:41,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [619474633] [2022-11-22 01:57:41,547 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:41,547 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:41,548 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:41,548 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:41,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:41,642 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:42,149 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41026#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:42,149 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:42,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:42,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 46 [2022-11-22 01:57:42,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861070180] [2022-11-22 01:57:42,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:42,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 01:57:42,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:42,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 01:57:42,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=421, Invalid=2549, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 01:57:42,151 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:43,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:43,884 INFO L93 Difference]: Finished difference Result 269 states and 286 transitions. [2022-11-22 01:57:43,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-22 01:57:43,884 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:57:43,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:43,885 INFO L225 Difference]: With dead ends: 269 [2022-11-22 01:57:43,885 INFO L226 Difference]: Without dead ends: 233 [2022-11-22 01:57:43,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 92 SyntacticMatches, 21 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3814 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1437, Invalid=8069, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 01:57:43,886 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 109 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:43,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 189 Invalid, 356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:43,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-11-22 01:57:44,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 60. [2022-11-22 01:57:44,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:44,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:44,066 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:44,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:44,066 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:44,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.0851063829787235) internal successors, (98), 46 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:44,066 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:44,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:44,067 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:44,067 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:44,071 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:44,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-11-22 01:57:44,267 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:44,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:44,267 INFO L85 PathProgramCache]: Analyzing trace with hash -1336470773, now seen corresponding path program 40 times [2022-11-22 01:57:44,267 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:44,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958979187] [2022-11-22 01:57:44,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:44,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:44,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:44,607 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 127 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:44,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:44,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958979187] [2022-11-22 01:57:44,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958979187] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:44,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737491266] [2022-11-22 01:57:44,607 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:44,607 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:44,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:44,608 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:44,610 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-11-22 01:57:44,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:44,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:44,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:45,233 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:45,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:45,539 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:45,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737491266] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:45,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1115928307] [2022-11-22 01:57:45,540 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:45,541 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:45,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:45,541 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:45,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:45,640 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:46,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42009#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:46,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:46,152 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:46,152 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 45 [2022-11-22 01:57:46,152 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567919301] [2022-11-22 01:57:46,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:46,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 01:57:46,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:46,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 01:57:46,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=402, Invalid=2460, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 01:57:46,153 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:48,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:48,128 INFO L93 Difference]: Finished difference Result 310 states and 328 transitions. [2022-11-22 01:57:48,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-22 01:57:48,128 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:57:48,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:48,129 INFO L225 Difference]: With dead ends: 310 [2022-11-22 01:57:48,129 INFO L226 Difference]: Without dead ends: 274 [2022-11-22 01:57:48,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 93 SyntacticMatches, 21 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3901 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1498, Invalid=8402, Unknown=0, NotChecked=0, Total=9900 [2022-11-22 01:57:48,130 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 165 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:48,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 212 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:48,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2022-11-22 01:57:48,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 60. [2022-11-22 01:57:48,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:48,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:48,272 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:48,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:48,272 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:48,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.108695652173913) internal successors, (97), 45 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:48,272 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:48,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:48,273 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:48,273 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:48,276 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2022-11-22 01:57:48,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:48,473 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:48,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:48,473 INFO L85 PathProgramCache]: Analyzing trace with hash -1502911076, now seen corresponding path program 41 times [2022-11-22 01:57:48,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:48,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071982102] [2022-11-22 01:57:48,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:48,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:48,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:48,795 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 127 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:48,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:48,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071982102] [2022-11-22 01:57:48,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071982102] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:48,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595250099] [2022-11-22 01:57:48,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:57:48,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:48,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:48,796 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:48,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-11-22 01:57:48,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-22 01:57:48,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:48,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:48,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:49,407 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 155 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:49,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:49,704 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 155 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:49,705 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595250099] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:49,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824672044] [2022-11-22 01:57:49,706 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:49,706 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:49,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:49,706 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:49,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:49,796 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:50,294 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43066#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:50,294 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:50,294 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:50,295 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 44 [2022-11-22 01:57:50,295 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227410108] [2022-11-22 01:57:50,295 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:50,295 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-22 01:57:50,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:50,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-22 01:57:50,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=2369, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 01:57:50,296 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:52,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:52,368 INFO L93 Difference]: Finished difference Result 350 states and 369 transitions. [2022-11-22 01:57:52,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 01:57:52,368 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:57:52,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:52,369 INFO L225 Difference]: With dead ends: 350 [2022-11-22 01:57:52,369 INFO L226 Difference]: Without dead ends: 314 [2022-11-22 01:57:52,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 94 SyntacticMatches, 21 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3844 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1498, Invalid=8402, Unknown=0, NotChecked=0, Total=9900 [2022-11-22 01:57:52,370 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 183 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 344 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 344 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:52,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 216 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 344 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:52,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 314 states. [2022-11-22 01:57:52,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 314 to 60. [2022-11-22 01:57:52,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:52,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:52,506 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:52,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:52,507 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:52,507 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.1333333333333333) internal successors, (96), 44 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:52,507 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:52,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:52,507 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:52,507 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:52,511 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:52,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:52,708 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:52,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:52,708 INFO L85 PathProgramCache]: Analyzing trace with hash -399901461, now seen corresponding path program 42 times [2022-11-22 01:57:52,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:52,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469807711] [2022-11-22 01:57:52,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:52,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:52,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:53,019 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 127 proven. 59 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:53,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:53,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469807711] [2022-11-22 01:57:53,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469807711] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:53,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500537443] [2022-11-22 01:57:53,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:57:53,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:53,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:53,020 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:53,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-11-22 01:57:53,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:57:53,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:57:53,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:53,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:53,672 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:53,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:54,011 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 155 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:54,012 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500537443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:54,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1859002944] [2022-11-22 01:57:54,013 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:54,013 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:54,013 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:54,013 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:54,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:54,098 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:54,607 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44191#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:54,607 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:54,607 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:54,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 43 [2022-11-22 01:57:54,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578562316] [2022-11-22 01:57:54,607 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:54,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 01:57:54,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:54,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 01:57:54,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=2276, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 01:57:54,611 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:56,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:57:56,772 INFO L93 Difference]: Finished difference Result 389 states and 409 transitions. [2022-11-22 01:57:56,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 01:57:56,772 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:57:56,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:57:56,774 INFO L225 Difference]: With dead ends: 389 [2022-11-22 01:57:56,774 INFO L226 Difference]: Without dead ends: 353 [2022-11-22 01:57:56,775 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 95 SyntacticMatches, 21 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3640 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1437, Invalid=8069, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 01:57:56,775 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 273 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:57:56,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 223 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:57:56,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-11-22 01:57:56,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 60. [2022-11-22 01:57:56,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:56,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:57:56,921 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:57:56,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:57:56,921 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:57:56,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.159090909090909) internal successors, (95), 43 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:57:56,921 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:57:56,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:57:56,922 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:57:56,922 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:57:56,926 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2022-11-22 01:57:57,126 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:57,126 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:57:57,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:57:57,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1436794812, now seen corresponding path program 43 times [2022-11-22 01:57:57,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:57:57,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145146573] [2022-11-22 01:57:57,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:57:57,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:57:57,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:57,435 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 127 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:57,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:57:57,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145146573] [2022-11-22 01:57:57,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145146573] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:57:57,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877933161] [2022-11-22 01:57:57,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:57:57,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:57:57,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:57:57,436 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:57:57,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-11-22 01:57:57,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:57:57,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:57:57,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:57:58,016 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:58,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:57:58,320 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 155 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:57:58,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877933161] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:57:58,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2099885544] [2022-11-22 01:57:58,321 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:57:58,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:57:58,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:57:58,322 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:57:58,322 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:57:58,417 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:57:58,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45378#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:57:58,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:57:58,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:57:58,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2022-11-22 01:57:58,916 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221183337] [2022-11-22 01:57:58,916 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:57:58,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-22 01:57:58,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:57:58,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-22 01:57:58,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=369, Invalid=2181, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 01:57:58,916 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 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) [2022-11-22 01:58:01,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:01,097 INFO L93 Difference]: Finished difference Result 427 states and 448 transitions. [2022-11-22 01:58:01,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-22 01:58:01,098 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:58:01,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:01,099 INFO L225 Difference]: With dead ends: 427 [2022-11-22 01:58:01,099 INFO L226 Difference]: Without dead ends: 391 [2022-11-22 01:58:01,099 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 96 SyntacticMatches, 21 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3298 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1321, Invalid=7421, Unknown=0, NotChecked=0, Total=8742 [2022-11-22 01:58:01,103 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 269 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:01,103 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 204 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:01,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2022-11-22 01:58:01,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 60. [2022-11-22 01:58:01,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:01,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:58:01,247 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:58:01,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:01,248 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:58:01,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.186046511627907) internal successors, (94), 42 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) [2022-11-22 01:58:01,248 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:58:01,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:58:01,248 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:01,248 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:01,252 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:01,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:01,449 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:01,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:01,449 INFO L85 PathProgramCache]: Analyzing trace with hash 1634590411, now seen corresponding path program 44 times [2022-11-22 01:58:01,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:01,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946297605] [2022-11-22 01:58:01,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:01,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:01,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:01,751 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 127 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:01,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:01,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946297605] [2022-11-22 01:58:01,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946297605] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:01,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [462957815] [2022-11-22 01:58:01,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:01,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:01,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:01,753 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:01,755 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-11-22 01:58:01,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-22 01:58:01,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:01,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:58:01,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:02,311 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:02,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:02,604 INFO L134 CoverageAnalysis]: Checked inductivity of 194 backedges. 155 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:02,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [462957815] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:02,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [733514859] [2022-11-22 01:58:02,605 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:02,605 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:02,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:02,606 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:02,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:02,690 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:03,186 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46621#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:03,187 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:03,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:03,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 41 [2022-11-22 01:58:03,187 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075062] [2022-11-22 01:58:03,187 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:03,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-22 01:58:03,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:03,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-22 01:58:03,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2084, Unknown=0, NotChecked=0, Total=2450 [2022-11-22 01:58:03,188 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:05,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:05,349 INFO L93 Difference]: Finished difference Result 464 states and 486 transitions. [2022-11-22 01:58:05,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-11-22 01:58:05,349 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:58:05,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:05,350 INFO L225 Difference]: With dead ends: 464 [2022-11-22 01:58:05,350 INFO L226 Difference]: Without dead ends: 428 [2022-11-22 01:58:05,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 97 SyntacticMatches, 21 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2839 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1162, Invalid=6494, Unknown=0, NotChecked=0, Total=7656 [2022-11-22 01:58:05,351 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 191 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:05,351 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 214 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:05,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2022-11-22 01:58:05,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 60. [2022-11-22 01:58:05,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:05,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:58:05,496 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:58:05,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:05,496 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:58:05,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:05,497 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:58:05,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:58:05,497 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:05,497 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:05,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2022-11-22 01:58:05,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:05,700 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:05,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:05,700 INFO L85 PathProgramCache]: Analyzing trace with hash -714333732, now seen corresponding path program 45 times [2022-11-22 01:58:05,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:05,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716144330] [2022-11-22 01:58:05,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:05,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:05,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:06,019 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 127 proven. 74 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:06,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:06,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716144330] [2022-11-22 01:58:06,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716144330] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:06,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713727611] [2022-11-22 01:58:06,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:58:06,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:06,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:06,020 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:06,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-11-22 01:58:06,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:58:06,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:06,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:58:06,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:06,549 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:06,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:06,845 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 155 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:06,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713727611] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:06,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296930997] [2022-11-22 01:58:06,846 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:06,846 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:06,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:06,846 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:06,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:06,929 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:07,430 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47914#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:07,430 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:07,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:07,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2022-11-22 01:58:07,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411978217] [2022-11-22 01:58:07,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:07,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-11-22 01:58:07,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:07,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-11-22 01:58:07,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=367, Invalid=1985, Unknown=0, NotChecked=0, Total=2352 [2022-11-22 01:58:07,432 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:09,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:09,584 INFO L93 Difference]: Finished difference Result 500 states and 523 transitions. [2022-11-22 01:58:09,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-22 01:58:09,585 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-22 01:58:09,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:09,585 INFO L225 Difference]: With dead ends: 500 [2022-11-22 01:58:09,585 INFO L226 Difference]: Without dead ends: 464 [2022-11-22 01:58:09,586 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 98 SyntacticMatches, 21 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2274 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=978, Invalid=5342, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 01:58:09,586 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 192 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:09,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 180 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:09,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2022-11-22 01:58:09,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 60. [2022-11-22 01:58:09,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 59 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:09,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2022-11-22 01:58:09,741 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 48 [2022-11-22 01:58:09,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:09,741 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2022-11-22 01:58:09,741 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.2439024390243905) internal successors, (92), 40 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:09,741 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2022-11-22 01:58:09,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-22 01:58:09,741 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:09,742 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:09,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:09,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2022-11-22 01:58:09,942 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:09,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:09,942 INFO L85 PathProgramCache]: Analyzing trace with hash 872462507, now seen corresponding path program 10 times [2022-11-22 01:58:09,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:09,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375483462] [2022-11-22 01:58:09,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:09,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:09,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:10,253 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 127 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:10,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:10,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375483462] [2022-11-22 01:58:10,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375483462] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:10,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36554331] [2022-11-22 01:58:10,254 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:58:10,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:10,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:10,255 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:10,257 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-11-22 01:58:10,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:10,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 26 conjunts are in the unsatisfiable core [2022-11-22 01:58:10,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:10,765 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:10,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:11,060 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 155 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:11,060 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36554331] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:11,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1929859089] [2022-11-22 01:58:11,061 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:11,061 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:11,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:11,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:11,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:11,142 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:11,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49251#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:11,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:11,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:11,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 39 [2022-11-22 01:58:11,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404659298] [2022-11-22 01:58:11,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:11,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-22 01:58:11,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:11,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-22 01:58:11,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1885, Unknown=0, NotChecked=0, Total=2256 [2022-11-22 01:58:11,659 INFO L87 Difference]: Start difference. First operand 60 states and 72 transitions. Second operand has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 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) [2022-11-22 01:58:13,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:13,716 INFO L93 Difference]: Finished difference Result 537 states and 562 transitions. [2022-11-22 01:58:13,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 01:58:13,716 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 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 48 [2022-11-22 01:58:13,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:13,717 INFO L225 Difference]: With dead ends: 537 [2022-11-22 01:58:13,717 INFO L226 Difference]: Without dead ends: 501 [2022-11-22 01:58:13,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 99 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1692 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=803, Invalid=4027, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 01:58:13,718 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 231 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:13,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 143 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:58:13,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-22 01:58:13,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 61. [2022-11-22 01:58:13,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.2333333333333334) internal successors, (74), 60 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:13,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 74 transitions. [2022-11-22 01:58:13,880 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 74 transitions. Word has length 48 [2022-11-22 01:58:13,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:13,881 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 74 transitions. [2022-11-22 01:58:13,881 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.25) internal successors, (90), 39 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) [2022-11-22 01:58:13,881 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 74 transitions. [2022-11-22 01:58:13,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-11-22 01:58:13,881 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:13,881 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:13,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:14,081 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable75 [2022-11-22 01:58:14,082 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:14,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:14,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1858978511, now seen corresponding path program 20 times [2022-11-22 01:58:14,082 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:14,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435120511] [2022-11-22 01:58:14,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:14,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:14,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:14,270 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:14,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:14,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435120511] [2022-11-22 01:58:14,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1435120511] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:14,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953664377] [2022-11-22 01:58:14,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:14,270 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:14,270 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:14,271 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:14,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-11-22 01:58:14,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-11-22 01:58:14,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:14,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:14,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:14,420 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:14,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:14,605 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 66 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:14,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953664377] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:14,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [833474571] [2022-11-22 01:58:14,606 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:14,606 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:14,607 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:14,607 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:14,607 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:14,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:15,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50615#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:15,069 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:15,069 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:15,069 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 15 [2022-11-22 01:58:15,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636960693] [2022-11-22 01:58:15,069 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:15,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-22 01:58:15,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:15,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-22 01:58:15,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2022-11-22 01:58:15,070 INFO L87 Difference]: Start difference. First operand 61 states and 74 transitions. Second operand has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:15,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:15,598 INFO L93 Difference]: Finished difference Result 72 states and 85 transitions. [2022-11-22 01:58:15,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-22 01:58:15,598 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 49 [2022-11-22 01:58:15,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:15,599 INFO L225 Difference]: With dead ends: 72 [2022-11-22 01:58:15,599 INFO L226 Difference]: Without dead ends: 70 [2022-11-22 01:58:15,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 125 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 441 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=992, Unknown=0, NotChecked=0, Total=1332 [2022-11-22 01:58:15,599 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 87 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:15,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 19 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:58:15,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-22 01:58:15,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2022-11-22 01:58:15,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.2222222222222223) internal successors, (77), 63 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:15,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 77 transitions. [2022-11-22 01:58:15,763 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 77 transitions. Word has length 49 [2022-11-22 01:58:15,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:15,763 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 77 transitions. [2022-11-22 01:58:15,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.1875) internal successors, (51), 15 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:15,763 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 77 transitions. [2022-11-22 01:58:15,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:15,763 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:15,764 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:15,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:15,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:15,964 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:15,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:15,964 INFO L85 PathProgramCache]: Analyzing trace with hash 1525349697, now seen corresponding path program 21 times [2022-11-22 01:58:15,964 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:15,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401382245] [2022-11-22 01:58:15,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:15,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:15,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:16,342 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:16,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:16,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401382245] [2022-11-22 01:58:16,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401382245] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:16,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144251343] [2022-11-22 01:58:16,343 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:58:16,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:16,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:16,344 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:16,346 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-11-22 01:58:16,406 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:58:16,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:16,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:16,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:17,141 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:17,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:17,509 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:17,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144251343] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:17,510 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1525207212] [2022-11-22 01:58:17,511 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:17,511 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:17,511 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:17,511 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:17,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:17,583 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:18,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51242#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:18,151 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:18,151 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:18,151 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 53 [2022-11-22 01:58:18,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411414436] [2022-11-22 01:58:18,151 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:18,152 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 01:58:18,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:18,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 01:58:18,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=592, Invalid=3190, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:58:18,152 INFO L87 Difference]: Start difference. First operand 64 states and 77 transitions. Second operand has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:19,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:19,256 INFO L93 Difference]: Finished difference Result 152 states and 167 transitions. [2022-11-22 01:58:19,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-22 01:58:19,256 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:19,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:19,256 INFO L225 Difference]: With dead ends: 152 [2022-11-22 01:58:19,256 INFO L226 Difference]: Without dead ends: 113 [2022-11-22 01:58:19,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 97 SyntacticMatches, 23 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3332 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1159, Invalid=6151, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 01:58:19,257 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 55 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:19,257 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 148 Invalid, 278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:58:19,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-11-22 01:58:19,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 65. [2022-11-22 01:58:19,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:19,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:19,429 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:19,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:19,429 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:19,429 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:19,429 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:19,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:19,430 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:19,430 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:19,434 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2022-11-22 01:58:19,630 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:19,630 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:19,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:19,631 INFO L85 PathProgramCache]: Analyzing trace with hash -481284398, now seen corresponding path program 46 times [2022-11-22 01:58:19,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:19,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431046936] [2022-11-22 01:58:19,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:19,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:19,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:20,061 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:20,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:20,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431046936] [2022-11-22 01:58:20,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431046936] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:20,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367204352] [2022-11-22 01:58:20,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:58:20,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:20,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:20,062 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:20,064 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-11-22 01:58:20,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:20,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:20,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:20,847 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:20,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:21,205 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:21,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367204352] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:21,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1541082297] [2022-11-22 01:58:21,206 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:21,206 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:21,206 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:21,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:21,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:21,315 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:21,842 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52029#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:21,843 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:21,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:21,843 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2022-11-22 01:58:21,843 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559493365] [2022-11-22 01:58:21,843 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:21,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 01:58:21,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:21,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 01:58:21,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3114, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 01:58:21,844 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:23,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:23,395 INFO L93 Difference]: Finished difference Result 200 states and 216 transitions. [2022-11-22 01:58:23,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 01:58:23,395 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:23,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:23,396 INFO L225 Difference]: With dead ends: 200 [2022-11-22 01:58:23,396 INFO L226 Difference]: Without dead ends: 161 [2022-11-22 01:58:23,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 98 SyntacticMatches, 23 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3856 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 01:58:23,396 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 70 mSDsluCounter, 183 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:23,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [70 Valid, 203 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:23,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-11-22 01:58:23,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 65. [2022-11-22 01:58:23,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:23,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:23,585 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:23,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:23,585 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:23,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0377358490566038) internal successors, (108), 52 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:23,586 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:23,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:23,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:23,586 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:23,590 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2022-11-22 01:58:23,786 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2022-11-22 01:58:23,787 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:23,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:23,787 INFO L85 PathProgramCache]: Analyzing trace with hash -1515845855, now seen corresponding path program 47 times [2022-11-22 01:58:23,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:23,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444679921] [2022-11-22 01:58:23,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:23,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:23,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:24,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444679921] [2022-11-22 01:58:24,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444679921] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:24,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12799000] [2022-11-22 01:58:24,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:24,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:24,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:24,144 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:24,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-11-22 01:58:24,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-22 01:58:24,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:24,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:24,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:24,905 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:24,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:25,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [12799000] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:25,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1467820730] [2022-11-22 01:58:25,257 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:25,257 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:25,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:25,257 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:25,257 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:25,341 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:25,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52917#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:25,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:25,869 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:25,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 51 [2022-11-22 01:58:25,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945427717] [2022-11-22 01:58:25,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:25,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 01:58:25,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:25,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 01:58:25,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=516, Invalid=3024, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:58:25,870 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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) [2022-11-22 01:58:27,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:27,790 INFO L93 Difference]: Finished difference Result 247 states and 264 transitions. [2022-11-22 01:58:27,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 01:58:27,790 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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) Word has length 52 [2022-11-22 01:58:27,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:27,791 INFO L225 Difference]: With dead ends: 247 [2022-11-22 01:58:27,791 INFO L226 Difference]: Without dead ends: 208 [2022-11-22 01:58:27,791 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 99 SyntacticMatches, 23 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4287 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 01:58:27,792 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 130 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 370 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 370 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:27,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 193 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 370 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:27,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-11-22 01:58:27,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 65. [2022-11-22 01:58:27,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:27,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:27,986 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:27,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:27,986 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:27,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.0576923076923075) internal successors, (107), 51 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) [2022-11-22 01:58:27,986 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:27,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:27,987 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:27,987 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:27,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:28,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-11-22 01:58:28,188 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:28,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:28,188 INFO L85 PathProgramCache]: Analyzing trace with hash 1914464498, now seen corresponding path program 48 times [2022-11-22 01:58:28,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:28,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866464064] [2022-11-22 01:58:28,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:28,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:28,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:28,591 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:28,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:28,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866464064] [2022-11-22 01:58:28,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866464064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:28,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189957194] [2022-11-22 01:58:28,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:58:28,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:28,592 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:28,593 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:28,599 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-11-22 01:58:28,657 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:58:28,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:28,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:28,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:29,349 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:29,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:29,708 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:29,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189957194] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:29,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1876546919] [2022-11-22 01:58:29,709 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:29,710 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:29,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:29,711 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:29,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:29,805 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:30,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53900#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:30,339 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:30,339 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:30,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 50 [2022-11-22 01:58:30,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115862275] [2022-11-22 01:58:30,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:30,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 01:58:30,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:30,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 01:58:30,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=490, Invalid=2932, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 01:58:30,341 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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) [2022-11-22 01:58:32,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:32,573 INFO L93 Difference]: Finished difference Result 293 states and 311 transitions. [2022-11-22 01:58:32,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-22 01:58:32,573 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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 52 [2022-11-22 01:58:32,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:32,574 INFO L225 Difference]: With dead ends: 293 [2022-11-22 01:58:32,574 INFO L226 Difference]: Without dead ends: 254 [2022-11-22 01:58:32,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 100 SyntacticMatches, 23 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4603 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2022-11-22 01:58:32,575 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 124 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:32,575 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [124 Valid, 202 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:32,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-11-22 01:58:32,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 65. [2022-11-22 01:58:32,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:32,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:32,795 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:32,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:32,796 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:32,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.0784313725490198) internal successors, (106), 50 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) [2022-11-22 01:58:32,796 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:32,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:32,796 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:32,796 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:32,800 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:32,997 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:32,997 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:32,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:32,997 INFO L85 PathProgramCache]: Analyzing trace with hash 224004353, now seen corresponding path program 49 times [2022-11-22 01:58:32,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:32,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259379437] [2022-11-22 01:58:32,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:32,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:33,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:33,352 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:33,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:33,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259379437] [2022-11-22 01:58:33,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259379437] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:33,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974427709] [2022-11-22 01:58:33,353 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:58:33,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:33,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:33,354 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:33,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-11-22 01:58:33,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:33,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:33,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:34,059 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:34,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:34,405 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:34,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974427709] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:34,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1279535122] [2022-11-22 01:58:34,406 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:34,406 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:34,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:34,406 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:34,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:34,512 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:35,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54972#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:35,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:35,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:35,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 49 [2022-11-22 01:58:35,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906584905] [2022-11-22 01:58:35,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:35,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 01:58:35,036 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:35,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 01:58:35,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=468, Invalid=2838, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 01:58:35,037 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:37,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:37,598 INFO L93 Difference]: Finished difference Result 338 states and 357 transitions. [2022-11-22 01:58:37,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 01:58:37,598 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:37,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:37,599 INFO L225 Difference]: With dead ends: 338 [2022-11-22 01:58:37,599 INFO L226 Difference]: Without dead ends: 299 [2022-11-22 01:58:37,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 101 SyntacticMatches, 23 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4783 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 01:58:37,601 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 127 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 480 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:37,601 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 276 Invalid, 480 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:37,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-11-22 01:58:37,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 65. [2022-11-22 01:58:37,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:37,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:37,857 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:37,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:37,857 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:37,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:37,857 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:37,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:37,858 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:37,858 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:37,862 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2022-11-22 01:58:38,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:38,058 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:38,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:38,059 INFO L85 PathProgramCache]: Analyzing trace with hash 1693494034, now seen corresponding path program 50 times [2022-11-22 01:58:38,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:38,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483846514] [2022-11-22 01:58:38,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:38,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:38,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:38,419 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:38,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:38,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483846514] [2022-11-22 01:58:38,420 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483846514] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:38,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [227678839] [2022-11-22 01:58:38,420 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:38,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:38,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:38,421 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:38,423 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-11-22 01:58:38,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-22 01:58:38,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:38,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:38,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:39,118 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:39,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:39,458 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:39,458 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [227678839] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:39,459 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1668492246] [2022-11-22 01:58:39,459 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:39,459 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:39,459 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:39,459 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:39,460 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:39,547 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:40,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56127#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:40,079 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:40,079 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:40,079 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 48 [2022-11-22 01:58:40,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748740334] [2022-11-22 01:58:40,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:40,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 01:58:40,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:40,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 01:58:40,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=450, Invalid=2742, Unknown=0, NotChecked=0, Total=3192 [2022-11-22 01:58:40,080 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:42,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:42,766 INFO L93 Difference]: Finished difference Result 382 states and 402 transitions. [2022-11-22 01:58:42,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-22 01:58:42,766 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:42,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:42,768 INFO L225 Difference]: With dead ends: 382 [2022-11-22 01:58:42,768 INFO L226 Difference]: Without dead ends: 343 [2022-11-22 01:58:42,769 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 102 SyntacticMatches, 23 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4806 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1860, Invalid=10350, Unknown=0, NotChecked=0, Total=12210 [2022-11-22 01:58:42,769 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 204 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:42,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 163 Invalid, 291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:58:42,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2022-11-22 01:58:42,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 65. [2022-11-22 01:58:42,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:42,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:42,975 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:42,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:42,975 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:42,975 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.122448979591837) internal successors, (104), 48 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:42,975 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:42,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:42,975 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:42,975 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:42,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:43,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:43,176 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:43,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:43,176 INFO L85 PathProgramCache]: Analyzing trace with hash -337313055, now seen corresponding path program 51 times [2022-11-22 01:58:43,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:43,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157210885] [2022-11-22 01:58:43,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:43,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:43,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:43,522 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 156 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:43,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:43,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157210885] [2022-11-22 01:58:43,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157210885] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:43,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453298091] [2022-11-22 01:58:43,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:58:43,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:43,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:43,527 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:43,529 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-11-22 01:58:43,590 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:58:43,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:43,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:43,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:44,225 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:44,225 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:44,563 INFO L134 CoverageAnalysis]: Checked inductivity of 223 backedges. 187 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:44,563 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453298091] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:44,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013952244] [2022-11-22 01:58:44,564 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:44,564 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:44,564 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:44,564 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:44,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:44,649 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:45,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '57359#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:45,170 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:45,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:45,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 47 [2022-11-22 01:58:45,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114645068] [2022-11-22 01:58:45,170 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:45,171 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 01:58:45,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:45,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 01:58:45,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=436, Invalid=2644, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 01:58:45,172 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 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) [2022-11-22 01:58:48,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:48,058 INFO L93 Difference]: Finished difference Result 425 states and 446 transitions. [2022-11-22 01:58:48,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-22 01:58:48,059 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:48,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:48,059 INFO L225 Difference]: With dead ends: 425 [2022-11-22 01:58:48,059 INFO L226 Difference]: Without dead ends: 386 [2022-11-22 01:58:48,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 103 SyntacticMatches, 23 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4663 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1825, Invalid=10165, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 01:58:48,061 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 190 mSDsluCounter, 189 mSDsCounter, 0 mSdLazyCounter, 351 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:48,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [190 Valid, 209 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 351 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:48,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 386 states. [2022-11-22 01:58:48,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 386 to 65. [2022-11-22 01:58:48,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:48,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:48,291 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:48,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:48,292 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:48,292 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.1458333333333335) internal successors, (103), 47 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) [2022-11-22 01:58:48,292 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:48,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:48,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:48,292 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:48,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:48,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:48,493 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:48,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:48,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1372654286, now seen corresponding path program 52 times [2022-11-22 01:58:48,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:48,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493283502] [2022-11-22 01:58:48,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:48,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:48,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:48,837 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 156 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:48,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:48,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493283502] [2022-11-22 01:58:48,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493283502] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:48,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918164126] [2022-11-22 01:58:48,838 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:58:48,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:48,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:48,839 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:48,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-11-22 01:58:48,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:48,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:48,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:49,506 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:49,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:49,842 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 187 proven. 38 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:49,842 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918164126] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:49,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283249534] [2022-11-22 01:58:49,843 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:49,843 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:49,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:49,843 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:49,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:49,936 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:50,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58662#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:50,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:50,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:50,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 46 [2022-11-22 01:58:50,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126637838] [2022-11-22 01:58:50,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:50,464 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 01:58:50,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:50,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 01:58:50,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=2544, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 01:58:50,465 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:53,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:53,516 INFO L93 Difference]: Finished difference Result 467 states and 489 transitions. [2022-11-22 01:58:53,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-11-22 01:58:53,516 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:53,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:53,517 INFO L225 Difference]: With dead ends: 467 [2022-11-22 01:58:53,517 INFO L226 Difference]: Without dead ends: 428 [2022-11-22 01:58:53,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 104 SyntacticMatches, 23 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4357 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1723, Invalid=9619, Unknown=0, NotChecked=0, Total=11342 [2022-11-22 01:58:53,518 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 212 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 295 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:53,518 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 295 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:53,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2022-11-22 01:58:53,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 65. [2022-11-22 01:58:53,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:53,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:53,742 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:53,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:53,742 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:53,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:53,743 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:53,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:53,743 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:53,744 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:53,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:53,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:53,944 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:53,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:53,944 INFO L85 PathProgramCache]: Analyzing trace with hash 2057630913, now seen corresponding path program 53 times [2022-11-22 01:58:53,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:53,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980054188] [2022-11-22 01:58:53,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:53,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:53,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:54,291 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 156 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:54,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980054188] [2022-11-22 01:58:54,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980054188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:54,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265402882] [2022-11-22 01:58:54,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:58:54,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:54,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:54,293 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:54,321 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-11-22 01:58:54,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-22 01:58:54,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:54,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:54,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:58:54,988 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:54,988 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:58:55,358 INFO L134 CoverageAnalysis]: Checked inductivity of 229 backedges. 187 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:55,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265402882] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:58:55,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [982834056] [2022-11-22 01:58:55,359 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:58:55,359 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:58:55,359 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:58:55,360 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:58:55,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:58:55,443 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:58:55,960 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60030#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:58:55,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:58:55,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:58:55,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2022-11-22 01:58:55,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860505530] [2022-11-22 01:58:55,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:58:55,961 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 01:58:55,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:58:55,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 01:58:55,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2442, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 01:58:55,962 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:59,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:58:59,023 INFO L93 Difference]: Finished difference Result 508 states and 531 transitions. [2022-11-22 01:58:59,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 01:58:59,024 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:58:59,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:58:59,025 INFO L225 Difference]: With dead ends: 508 [2022-11-22 01:58:59,025 INFO L226 Difference]: Without dead ends: 469 [2022-11-22 01:58:59,025 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 105 SyntacticMatches, 23 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3903 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1563, Invalid=8739, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 01:58:59,026 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 233 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:58:59,026 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 235 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:58:59,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2022-11-22 01:58:59,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 65. [2022-11-22 01:58:59,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:59,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:58:59,240 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:58:59,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:58:59,240 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:58:59,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.1956521739130435) internal successors, (101), 45 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:58:59,241 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:58:59,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:58:59,241 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:58:59,241 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:58:59,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-11-22 01:58:59,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2022-11-22 01:58:59,442 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:58:59,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:58:59,442 INFO L85 PathProgramCache]: Analyzing trace with hash 1891190610, now seen corresponding path program 54 times [2022-11-22 01:58:59,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:58:59,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817301342] [2022-11-22 01:58:59,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:58:59,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:58:59,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:58:59,796 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 156 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:58:59,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:58:59,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817301342] [2022-11-22 01:58:59,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817301342] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:58:59,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366188833] [2022-11-22 01:58:59,798 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:58:59,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:58:59,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:58:59,800 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:58:59,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-11-22 01:58:59,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:58:59,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:58:59,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:58:59,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:00,418 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:00,418 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:00,754 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 187 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:00,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366188833] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:00,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083439733] [2022-11-22 01:59:00,756 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:00,756 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:00,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:00,757 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:00,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:00,858 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:01,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '61457#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:01,372 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:01,372 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:01,372 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 44 [2022-11-22 01:59:01,373 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081872816] [2022-11-22 01:59:01,373 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:01,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-22 01:59:01,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:01,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-22 01:59:01,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=418, Invalid=2338, Unknown=0, NotChecked=0, Total=2756 [2022-11-22 01:59:01,374 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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) [2022-11-22 01:59:04,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:04,419 INFO L93 Difference]: Finished difference Result 548 states and 572 transitions. [2022-11-22 01:59:04,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-22 01:59:04,420 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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 52 [2022-11-22 01:59:04,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:04,421 INFO L225 Difference]: With dead ends: 548 [2022-11-22 01:59:04,421 INFO L226 Difference]: Without dead ends: 509 [2022-11-22 01:59:04,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 106 SyntacticMatches, 23 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3328 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1360, Invalid=7570, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 01:59:04,421 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 336 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 336 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:04,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [336 Valid, 196 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:04,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2022-11-22 01:59:04,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 65. [2022-11-22 01:59:04,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:04,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:59:04,642 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:59:04,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:04,642 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:59:04,642 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.2222222222222223) internal successors, (100), 44 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) [2022-11-22 01:59:04,642 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:59:04,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:59:04,643 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:04,643 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:04,653 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:04,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable86 [2022-11-22 01:59:04,853 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:04,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:04,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1300767071, now seen corresponding path program 55 times [2022-11-22 01:59:04,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:04,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512617007] [2022-11-22 01:59:04,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:04,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:04,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:05,203 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 156 proven. 87 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:05,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:05,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512617007] [2022-11-22 01:59:05,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512617007] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:05,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905142732] [2022-11-22 01:59:05,204 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:59:05,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:05,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:05,207 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:05,209 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-11-22 01:59:05,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:05,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:59:05,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:05,797 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:05,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:06,138 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 187 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:06,138 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905142732] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:06,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [168215794] [2022-11-22 01:59:06,139 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:06,139 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:06,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:06,139 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:06,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:06,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:06,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62937#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:06,743 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:06,743 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:06,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2022-11-22 01:59:06,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052351939] [2022-11-22 01:59:06,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:06,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-11-22 01:59:06,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:06,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-11-22 01:59:06,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=420, Invalid=2232, Unknown=0, NotChecked=0, Total=2652 [2022-11-22 01:59:06,744 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:09,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:09,785 INFO L93 Difference]: Finished difference Result 587 states and 612 transitions. [2022-11-22 01:59:09,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 01:59:09,786 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:59:09,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:09,787 INFO L225 Difference]: With dead ends: 587 [2022-11-22 01:59:09,787 INFO L226 Difference]: Without dead ends: 548 [2022-11-22 01:59:09,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 107 SyntacticMatches, 23 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2647 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1135, Invalid=6175, Unknown=0, NotChecked=0, Total=7310 [2022-11-22 01:59:09,788 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 267 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:09,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 240 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 367 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:09,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2022-11-22 01:59:10,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 65. [2022-11-22 01:59:10,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.21875) internal successors, (78), 64 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:10,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-11-22 01:59:10,019 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 52 [2022-11-22 01:59:10,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:10,019 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-11-22 01:59:10,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.25) internal successors, (99), 43 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:10,019 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-11-22 01:59:10,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-11-22 01:59:10,020 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:10,020 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:10,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:10,220 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:10,221 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:10,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:10,221 INFO L85 PathProgramCache]: Analyzing trace with hash 535929202, now seen corresponding path program 11 times [2022-11-22 01:59:10,221 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:10,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126241915] [2022-11-22 01:59:10,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:10,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:10,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:10,575 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 156 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:10,575 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:10,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126241915] [2022-11-22 01:59:10,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126241915] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:10,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25908178] [2022-11-22 01:59:10,575 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:59:10,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:10,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:10,576 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:10,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-11-22 01:59:10,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-22 01:59:10,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:10,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-22 01:59:10,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:11,172 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:11,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:11,508 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 187 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:11,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25908178] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:11,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1122645874] [2022-11-22 01:59:11,509 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:11,509 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:11,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:11,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:11,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:11,589 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:12,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64464#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:12,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:12,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:12,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 42 [2022-11-22 01:59:12,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861895768] [2022-11-22 01:59:12,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:12,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-22 01:59:12,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:12,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-22 01:59:12,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=425, Invalid=2125, Unknown=0, NotChecked=0, Total=2550 [2022-11-22 01:59:12,231 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:15,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:15,263 INFO L93 Difference]: Finished difference Result 627 states and 654 transitions. [2022-11-22 01:59:15,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 01:59:15,263 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52 [2022-11-22 01:59:15,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:15,264 INFO L225 Difference]: With dead ends: 627 [2022-11-22 01:59:15,264 INFO L226 Difference]: Without dead ends: 588 [2022-11-22 01:59:15,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 108 SyntacticMatches, 23 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1960 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=926, Invalid=4624, Unknown=0, NotChecked=0, Total=5550 [2022-11-22 01:59:15,265 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 276 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:15,265 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 187 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:15,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2022-11-22 01:59:15,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 66. [2022-11-22 01:59:15,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 65 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:15,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 80 transitions. [2022-11-22 01:59:15,500 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 80 transitions. Word has length 52 [2022-11-22 01:59:15,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:15,500 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 80 transitions. [2022-11-22 01:59:15,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.255813953488372) internal successors, (97), 42 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:15,500 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 80 transitions. [2022-11-22 01:59:15,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-22 01:59:15,500 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:15,500 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:15,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:15,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:15,701 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:15,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:15,701 INFO L85 PathProgramCache]: Analyzing trace with hash 1303066309, now seen corresponding path program 22 times [2022-11-22 01:59:15,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:15,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469382774] [2022-11-22 01:59:15,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:15,702 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:15,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:15,892 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:15,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:15,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469382774] [2022-11-22 01:59:15,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469382774] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:15,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [285518935] [2022-11-22 01:59:15,893 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:59:15,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:15,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:15,894 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:15,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-11-22 01:59:15,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:15,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:15,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:16,026 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:16,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:16,246 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 78 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:16,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [285518935] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:16,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [672748139] [2022-11-22 01:59:16,248 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:16,248 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:16,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:16,248 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:16,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:16,323 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:16,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66019#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:16,717 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:16,717 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:16,717 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 16 [2022-11-22 01:59:16,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283066781] [2022-11-22 01:59:16,718 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:16,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-22 01:59:16,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:16,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-22 01:59:16,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=457, Unknown=0, NotChecked=0, Total=600 [2022-11-22 01:59:16,718 INFO L87 Difference]: Start difference. First operand 66 states and 80 transitions. Second operand has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:17,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:17,398 INFO L93 Difference]: Finished difference Result 77 states and 91 transitions. [2022-11-22 01:59:17,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-22 01:59:17,398 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2022-11-22 01:59:17,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:17,399 INFO L225 Difference]: With dead ends: 77 [2022-11-22 01:59:17,399 INFO L226 Difference]: Without dead ends: 75 [2022-11-22 01:59:17,399 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 136 SyntacticMatches, 24 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=384, Invalid=1098, Unknown=0, NotChecked=0, Total=1482 [2022-11-22 01:59:17,399 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 92 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:17,399 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 26 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:59:17,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-22 01:59:17,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 69. [2022-11-22 01:59:17,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.2205882352941178) internal successors, (83), 68 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:17,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2022-11-22 01:59:17,640 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 53 [2022-11-22 01:59:17,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:17,640 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2022-11-22 01:59:17,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.235294117647059) internal successors, (55), 16 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:17,641 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2022-11-22 01:59:17,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:17,641 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:17,641 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:17,645 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2022-11-22 01:59:17,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-11-22 01:59:17,841 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:17,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:17,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1738833291, now seen corresponding path program 23 times [2022-11-22 01:59:17,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:17,842 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684364882] [2022-11-22 01:59:17,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:17,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:17,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:18,303 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:18,303 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:18,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684364882] [2022-11-22 01:59:18,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684364882] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:18,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103469770] [2022-11-22 01:59:18,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:59:18,304 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:18,304 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:18,305 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:18,307 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-11-22 01:59:18,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 01:59:18,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:18,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:18,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:19,211 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:19,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:19,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103469770] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:19,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805094925] [2022-11-22 01:59:19,621 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:19,621 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:19,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:19,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:19,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:19,691 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:20,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '66694#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:20,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:20,276 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:20,276 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 57 [2022-11-22 01:59:20,276 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659542459] [2022-11-22 01:59:20,276 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:20,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 01:59:20,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:20,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 01:59:20,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=676, Invalid=3614, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 01:59:20,277 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:21,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:21,672 INFO L93 Difference]: Finished difference Result 164 states and 180 transitions. [2022-11-22 01:59:21,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-22 01:59:21,673 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:21,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:21,673 INFO L225 Difference]: With dead ends: 164 [2022-11-22 01:59:21,673 INFO L226 Difference]: Without dead ends: 122 [2022-11-22 01:59:21,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 105 SyntacticMatches, 25 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3857 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1329, Invalid=7043, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 01:59:21,674 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 32 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:21,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 163 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 01:59:21,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-22 01:59:21,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 70. [2022-11-22 01:59:21,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:21,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:21,931 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:21,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:21,932 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:21,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.0) internal successors, (116), 57 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:21,932 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:21,932 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:21,932 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:21,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:22,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:22,134 INFO L420 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:22,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:22,135 INFO L85 PathProgramCache]: Analyzing trace with hash -268140900, now seen corresponding path program 56 times [2022-11-22 01:59:22,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:22,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127382588] [2022-11-22 01:59:22,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:22,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:22,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:22,594 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:22,594 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:22,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127382588] [2022-11-22 01:59:22,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127382588] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:22,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471718015] [2022-11-22 01:59:22,594 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:59:22,594 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:22,595 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:22,595 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:22,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2022-11-22 01:59:22,672 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 01:59:22,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:22,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:22,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:23,492 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:23,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:23,904 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:23,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471718015] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:23,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [498344794] [2022-11-22 01:59:23,905 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:23,905 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:23,905 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:23,905 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:23,905 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:23,993 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:24,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67543#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:24,552 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:24,552 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:24,552 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 56 [2022-11-22 01:59:24,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789315180] [2022-11-22 01:59:24,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:24,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-22 01:59:24,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:24,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-22 01:59:24,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=3533, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 01:59:24,553 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:26,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:26,485 INFO L93 Difference]: Finished difference Result 216 states and 233 transitions. [2022-11-22 01:59:26,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 01:59:26,485 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:26,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:26,485 INFO L225 Difference]: With dead ends: 216 [2022-11-22 01:59:26,485 INFO L226 Difference]: Without dead ends: 174 [2022-11-22 01:59:26,486 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 106 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4491 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 01:59:26,486 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 80 mSDsluCounter, 181 mSDsCounter, 0 mSdLazyCounter, 382 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 382 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:26,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 202 Invalid, 401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 382 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:26,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-22 01:59:26,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 70. [2022-11-22 01:59:26,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:26,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:26,764 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:26,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:26,764 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:26,764 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.0350877192982457) internal successors, (116), 56 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:26,764 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:26,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:26,764 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:26,764 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:26,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2022-11-22 01:59:26,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:26,967 INFO L420 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:26,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:26,967 INFO L85 PathProgramCache]: Analyzing trace with hash 1745327979, now seen corresponding path program 57 times [2022-11-22 01:59:26,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:26,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691435799] [2022-11-22 01:59:26,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:26,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:26,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:27,398 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:27,398 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:27,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691435799] [2022-11-22 01:59:27,398 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691435799] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:27,398 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630415101] [2022-11-22 01:59:27,398 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:59:27,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:27,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:27,399 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:27,403 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2022-11-22 01:59:27,463 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:59:27,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:27,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:27,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:28,242 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:28,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:28,642 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:28,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630415101] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:28,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509668803] [2022-11-22 01:59:28,643 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:28,643 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:28,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:28,643 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:28,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:28,734 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:29,281 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '68502#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:29,281 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:29,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:29,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-11-22 01:59:29,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431008266] [2022-11-22 01:59:29,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:29,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-22 01:59:29,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:29,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-22 01:59:29,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3438, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 01:59:29,283 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:31,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:31,783 INFO L93 Difference]: Finished difference Result 267 states and 285 transitions. [2022-11-22 01:59:31,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-22 01:59:31,783 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:31,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:31,784 INFO L225 Difference]: With dead ends: 267 [2022-11-22 01:59:31,784 INFO L226 Difference]: Without dead ends: 225 [2022-11-22 01:59:31,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 107 SyntacticMatches, 25 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5036 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 01:59:31,785 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 117 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 512 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 512 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:31,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 282 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 512 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:31,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-11-22 01:59:32,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 70. [2022-11-22 01:59:32,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:32,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:32,152 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:32,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:32,152 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:32,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.0535714285714284) internal successors, (115), 55 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:32,152 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:32,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:32,152 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:32,152 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:32,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2022-11-22 01:59:32,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:32,353 INFO L420 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:32,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:32,353 INFO L85 PathProgramCache]: Analyzing trace with hash 1810278588, now seen corresponding path program 58 times [2022-11-22 01:59:32,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:32,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913091400] [2022-11-22 01:59:32,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:32,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:32,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:32,769 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:32,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:32,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913091400] [2022-11-22 01:59:32,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913091400] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:32,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [255459753] [2022-11-22 01:59:32,769 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:59:32,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:32,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:32,770 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:32,772 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2022-11-22 01:59:32,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:32,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:32,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:33,589 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:33,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:33,990 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:33,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [255459753] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:33,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1855295371] [2022-11-22 01:59:33,991 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:33,991 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:33,992 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:33,992 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:33,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:34,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:34,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69565#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:34,629 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:34,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:34,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 54 [2022-11-22 01:59:34,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063278468] [2022-11-22 01:59:34,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:34,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 01:59:34,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:34,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 01:59:34,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=3341, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 01:59:34,630 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 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) [2022-11-22 01:59:37,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:37,515 INFO L93 Difference]: Finished difference Result 317 states and 336 transitions. [2022-11-22 01:59:37,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 01:59:37,515 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 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) Word has length 56 [2022-11-22 01:59:37,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:37,516 INFO L225 Difference]: With dead ends: 317 [2022-11-22 01:59:37,516 INFO L226 Difference]: Without dead ends: 275 [2022-11-22 01:59:37,516 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 108 SyntacticMatches, 25 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5466 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2022-11-22 01:59:37,517 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 123 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 421 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:37,517 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 239 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 421 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:37,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-11-22 01:59:37,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 70. [2022-11-22 01:59:37,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:37,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:37,808 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:37,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:37,808 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:37,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.0727272727272728) internal successors, (114), 54 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) [2022-11-22 01:59:37,809 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:37,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:37,809 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:37,809 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:37,813 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2022-11-22 01:59:38,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:38,010 INFO L420 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:38,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:38,010 INFO L85 PathProgramCache]: Analyzing trace with hash -265836213, now seen corresponding path program 59 times [2022-11-22 01:59:38,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:38,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540806981] [2022-11-22 01:59:38,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:38,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:38,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:38,445 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:38,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:38,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540806981] [2022-11-22 01:59:38,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540806981] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:38,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559974715] [2022-11-22 01:59:38,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:59:38,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:38,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:38,446 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:38,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2022-11-22 01:59:38,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 01:59:38,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:38,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:38,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:39,259 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:39,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:39,660 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:39,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559974715] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:39,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531110679] [2022-11-22 01:59:39,661 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:39,661 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:39,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:39,661 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:39,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:39,747 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:40,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70726#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:40,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:40,301 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:40,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 53 [2022-11-22 01:59:40,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827104783] [2022-11-22 01:59:40,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:40,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 01:59:40,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:40,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 01:59:40,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=540, Invalid=3242, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 01:59:40,303 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 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) [2022-11-22 01:59:43,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:43,575 INFO L93 Difference]: Finished difference Result 366 states and 386 transitions. [2022-11-22 01:59:43,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-22 01:59:43,576 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:43,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:43,576 INFO L225 Difference]: With dead ends: 366 [2022-11-22 01:59:43,576 INFO L226 Difference]: Without dead ends: 324 [2022-11-22 01:59:43,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 109 SyntacticMatches, 25 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5755 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2022-11-22 01:59:43,577 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 132 mSDsluCounter, 226 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:43,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 247 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 412 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:43,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2022-11-22 01:59:43,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 70. [2022-11-22 01:59:43,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:43,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:43,877 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:43,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:43,877 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:43,878 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 53 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) [2022-11-22 01:59:43,878 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:43,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:43,878 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:43,878 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:43,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:44,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:44,084 INFO L420 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:44,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:44,084 INFO L85 PathProgramCache]: Analyzing trace with hash 2022496988, now seen corresponding path program 60 times [2022-11-22 01:59:44,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:44,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299392863] [2022-11-22 01:59:44,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:44,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:44,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:44,546 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:44,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:44,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299392863] [2022-11-22 01:59:44,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299392863] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:44,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781991313] [2022-11-22 01:59:44,546 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 01:59:44,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:44,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:44,547 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:44,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2022-11-22 01:59:44,622 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 01:59:44,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:44,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:44,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:45,339 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:45,339 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:45,724 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:45,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781991313] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:45,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763767098] [2022-11-22 01:59:45,725 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:45,725 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:45,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:45,725 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:45,725 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:45,809 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:46,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71979#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:46,360 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:46,360 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:46,360 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 52 [2022-11-22 01:59:46,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392451900] [2022-11-22 01:59:46,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:46,361 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 01:59:46,361 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:46,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 01:59:46,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=519, Invalid=3141, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 01:59:46,363 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 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) [2022-11-22 01:59:50,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:50,014 INFO L93 Difference]: Finished difference Result 414 states and 435 transitions. [2022-11-22 01:59:50,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 01:59:50,014 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:50,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:50,015 INFO L225 Difference]: With dead ends: 414 [2022-11-22 01:59:50,015 INFO L226 Difference]: Without dead ends: 372 [2022-11-22 01:59:50,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 110 SyntacticMatches, 25 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5876 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2022-11-22 01:59:50,016 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 180 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 492 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 492 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:50,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 277 Invalid, 525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 492 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:50,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2022-11-22 01:59:50,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 70. [2022-11-22 01:59:50,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:50,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:50,324 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:50,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:50,324 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:50,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.1132075471698113) internal successors, (112), 52 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) [2022-11-22 01:59:50,325 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:50,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:50,325 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:50,325 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:50,330 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2022-11-22 01:59:50,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:50,528 INFO L420 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:50,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:50,528 INFO L85 PathProgramCache]: Analyzing trace with hash 987935531, now seen corresponding path program 61 times [2022-11-22 01:59:50,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:50,528 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045735349] [2022-11-22 01:59:50,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:50,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:50,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:50,923 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 188 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:50,923 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:50,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045735349] [2022-11-22 01:59:50,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045735349] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:50,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715929282] [2022-11-22 01:59:50,924 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 01:59:50,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:50,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:50,933 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:50,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2022-11-22 01:59:51,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:51,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:51,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:51,752 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:51,752 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:52,132 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 222 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:52,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715929282] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:52,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [275092653] [2022-11-22 01:59:52,134 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:52,134 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:52,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:52,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:52,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:52,223 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:52,762 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73318#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:52,762 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:52,762 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:52,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 51 [2022-11-22 01:59:52,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2011642649] [2022-11-22 01:59:52,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:52,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 01:59:52,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:52,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 01:59:52,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=3038, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 01:59:52,764 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:56,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 01:59:56,714 INFO L93 Difference]: Finished difference Result 461 states and 483 transitions. [2022-11-22 01:59:56,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-22 01:59:56,714 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 01:59:56,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 01:59:56,715 INFO L225 Difference]: With dead ends: 461 [2022-11-22 01:59:56,715 INFO L226 Difference]: Without dead ends: 419 [2022-11-22 01:59:56,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 111 SyntacticMatches, 25 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5814 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2264, Invalid=12498, Unknown=0, NotChecked=0, Total=14762 [2022-11-22 01:59:56,716 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 189 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 01:59:56,716 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [189 Valid, 255 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 01:59:56,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 419 states. [2022-11-22 01:59:57,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 419 to 70. [2022-11-22 01:59:57,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:57,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 01:59:57,038 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 01:59:57,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 01:59:57,038 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 01:59:57,038 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.1346153846153846) internal successors, (111), 51 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 01:59:57,038 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 01:59:57,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 01:59:57,039 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 01:59:57,039 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 01:59:57,043 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Forceful destruction successful, exit code 0 [2022-11-22 01:59:57,239 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2022-11-22 01:59:57,239 INFO L420 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 01:59:57,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 01:59:57,240 INFO L85 PathProgramCache]: Analyzing trace with hash 123278588, now seen corresponding path program 62 times [2022-11-22 01:59:57,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 01:59:57,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013774275] [2022-11-22 01:59:57,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 01:59:57,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 01:59:57,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 01:59:57,649 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 188 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:57,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 01:59:57,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013774275] [2022-11-22 01:59:57,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013774275] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 01:59:57,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [148336577] [2022-11-22 01:59:57,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 01:59:57,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 01:59:57,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 01:59:57,652 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 01:59:57,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2022-11-22 01:59:57,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 01:59:57,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 01:59:57,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 01:59:57,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 01:59:58,414 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:58,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 01:59:58,795 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 222 proven. 43 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 01:59:58,795 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [148336577] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 01:59:58,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [148158957] [2022-11-22 01:59:58,796 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 01:59:58,796 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 01:59:58,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 01:59:58,797 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 01:59:58,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 01:59:58,878 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 01:59:59,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '74737#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 01:59:59,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 01:59:59,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 01:59:59,426 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 50 [2022-11-22 01:59:59,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688833916] [2022-11-22 01:59:59,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 01:59:59,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 01:59:59,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 01:59:59,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 01:59:59,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=2933, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 01:59:59,427 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:03,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:03,536 INFO L93 Difference]: Finished difference Result 507 states and 530 transitions. [2022-11-22 02:00:03,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-22 02:00:03,536 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 02:00:03,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:03,537 INFO L225 Difference]: With dead ends: 507 [2022-11-22 02:00:03,537 INFO L226 Difference]: Without dead ends: 465 [2022-11-22 02:00:03,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 112 SyntacticMatches, 25 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5566 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2186, Invalid=12094, Unknown=0, NotChecked=0, Total=14280 [2022-11-22 02:00:03,538 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 216 mSDsluCounter, 229 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:03,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 250 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:03,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2022-11-22 02:00:03,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 70. [2022-11-22 02:00:03,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:03,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 02:00:03,852 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 02:00:03,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:03,852 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 02:00:03,852 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.156862745098039) internal successors, (110), 50 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:03,852 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 02:00:03,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 02:00:03,853 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:03,853 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:03,857 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2022-11-22 02:00:04,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2022-11-22 02:00:04,053 INFO L420 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:04,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:04,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1567181557, now seen corresponding path program 63 times [2022-11-22 02:00:04,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:04,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008737670] [2022-11-22 02:00:04,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:04,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:04,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 188 proven. 80 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:04,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:04,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008737670] [2022-11-22 02:00:04,454 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2008737670] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:04,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228499548] [2022-11-22 02:00:04,455 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:04,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:04,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:04,456 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:04,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2022-11-22 02:00:04,520 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:04,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:04,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:00:04,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:05,177 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:05,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:05,557 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 222 proven. 46 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:05,558 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228499548] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:05,558 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1615242359] [2022-11-22 02:00:05,559 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:05,559 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:05,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:05,559 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:05,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:05,659 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:06,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '76230#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:06,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:06,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:06,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 49 [2022-11-22 02:00:06,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453592577] [2022-11-22 02:00:06,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:06,196 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:00:06,196 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:06,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:00:06,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=2826, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:00:06,197 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:10,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:10,403 INFO L93 Difference]: Finished difference Result 552 states and 576 transitions. [2022-11-22 02:00:10,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 02:00:10,403 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 02:00:10,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:10,404 INFO L225 Difference]: With dead ends: 552 [2022-11-22 02:00:10,404 INFO L226 Difference]: Without dead ends: 510 [2022-11-22 02:00:10,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 113 SyntacticMatches, 25 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5141 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2036, Invalid=11304, Unknown=0, NotChecked=0, Total=13340 [2022-11-22 02:00:10,405 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 256 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:10,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 241 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:10,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2022-11-22 02:00:10,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 70. [2022-11-22 02:00:10,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:10,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 02:00:10,723 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 02:00:10,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:10,723 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 02:00:10,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.18) internal successors, (109), 49 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:10,724 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 02:00:10,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 02:00:10,724 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:10,724 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:10,728 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2022-11-22 02:00:10,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:10,925 INFO L420 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:10,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:10,925 INFO L85 PathProgramCache]: Analyzing trace with hash -97691876, now seen corresponding path program 64 times [2022-11-22 02:00:10,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:10,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822386347] [2022-11-22 02:00:10,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:10,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:10,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:11,329 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 188 proven. 85 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:11,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:11,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822386347] [2022-11-22 02:00:11,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822386347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:11,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491498752] [2022-11-22 02:00:11,329 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:00:11,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:11,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:11,331 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:11,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-11-22 02:00:11,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:11,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:00:11,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:12,028 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:12,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 222 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:12,408 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491498752] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:12,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145069025] [2022-11-22 02:00:12,409 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:12,409 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:12,409 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:12,409 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:12,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:12,503 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:13,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77791#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:13,037 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:13,037 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:13,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 48 [2022-11-22 02:00:13,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956020345] [2022-11-22 02:00:13,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:13,038 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 02:00:13,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:13,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 02:00:13,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=475, Invalid=2717, Unknown=0, NotChecked=0, Total=3192 [2022-11-22 02:00:13,038 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:17,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:17,322 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2022-11-22 02:00:17,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-11-22 02:00:17,322 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 02:00:17,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:17,324 INFO L225 Difference]: With dead ends: 596 [2022-11-22 02:00:17,324 INFO L226 Difference]: Without dead ends: 554 [2022-11-22 02:00:17,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 114 SyntacticMatches, 25 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4560 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1826, Invalid=10164, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 02:00:17,326 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 331 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:17,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [331 Valid, 223 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:17,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2022-11-22 02:00:17,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 70. [2022-11-22 02:00:17,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:17,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 02:00:17,651 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 02:00:17,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:17,651 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 02:00:17,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.204081632653061) internal successors, (108), 48 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:17,651 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 02:00:17,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 02:00:17,651 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:17,651 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:17,656 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2022-11-22 02:00:17,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:17,852 INFO L420 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:17,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:17,852 INFO L85 PathProgramCache]: Analyzing trace with hash -2128498965, now seen corresponding path program 65 times [2022-11-22 02:00:17,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:17,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146329216] [2022-11-22 02:00:17,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:17,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:17,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:18,254 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 188 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:18,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:18,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146329216] [2022-11-22 02:00:18,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146329216] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:18,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77471339] [2022-11-22 02:00:18,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:00:18,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:18,255 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:18,257 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:18,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2022-11-22 02:00:18,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-22 02:00:18,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:18,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:00:18,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:18,951 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:18,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:19,329 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 222 proven. 58 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:19,329 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77471339] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:19,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1555740301] [2022-11-22 02:00:19,330 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:19,330 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:19,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:19,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:19,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:19,415 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:19,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '79414#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:19,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:19,948 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:19,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 47 [2022-11-22 02:00:19,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764773763] [2022-11-22 02:00:19,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:19,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-22 02:00:19,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:19,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-22 02:00:19,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=2606, Unknown=0, NotChecked=0, Total=3080 [2022-11-22 02:00:19,949 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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) [2022-11-22 02:00:24,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:24,269 INFO L93 Difference]: Finished difference Result 639 states and 665 transitions. [2022-11-22 02:00:24,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 02:00:24,269 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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) Word has length 56 [2022-11-22 02:00:24,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:24,270 INFO L225 Difference]: With dead ends: 639 [2022-11-22 02:00:24,270 INFO L226 Difference]: Without dead ends: 597 [2022-11-22 02:00:24,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 115 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3856 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1574, Invalid=8728, Unknown=0, NotChecked=0, Total=10302 [2022-11-22 02:00:24,272 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 389 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 348 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 348 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:24,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 224 Invalid, 365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 348 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:24,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2022-11-22 02:00:24,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 70. [2022-11-22 02:00:24,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:24,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 02:00:24,632 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 02:00:24,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:24,633 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 02:00:24,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.2291666666666665) internal successors, (107), 47 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) [2022-11-22 02:00:24,633 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 02:00:24,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 02:00:24,633 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:24,633 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:24,637 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2022-11-22 02:00:24,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2022-11-22 02:00:24,834 INFO L420 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:24,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:24,834 INFO L85 PathProgramCache]: Analyzing trace with hash 1131127100, now seen corresponding path program 66 times [2022-11-22 02:00:24,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:24,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286628520] [2022-11-22 02:00:24,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:24,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:24,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:25,237 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 188 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:25,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:25,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286628520] [2022-11-22 02:00:25,238 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286628520] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:25,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716335781] [2022-11-22 02:00:25,238 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:25,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:25,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:25,239 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:25,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2022-11-22 02:00:25,308 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:25,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:25,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:00:25,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:25,905 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:25,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:26,302 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 222 proven. 67 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:26,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716335781] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:26,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422592057] [2022-11-22 02:00:26,303 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:26,303 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:26,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:26,303 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:26,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:26,401 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:26,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '81093#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:26,944 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:26,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:26,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2022-11-22 02:00:26,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218451427] [2022-11-22 02:00:26,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:26,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-11-22 02:00:26,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:26,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-11-22 02:00:26,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2493, Unknown=0, NotChecked=0, Total=2970 [2022-11-22 02:00:26,946 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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) [2022-11-22 02:00:31,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:31,361 INFO L93 Difference]: Finished difference Result 681 states and 708 transitions. [2022-11-22 02:00:31,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-22 02:00:31,361 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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 56 [2022-11-22 02:00:31,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:31,362 INFO L225 Difference]: With dead ends: 681 [2022-11-22 02:00:31,362 INFO L226 Difference]: Without dead ends: 639 [2022-11-22 02:00:31,363 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 116 SyntacticMatches, 25 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3048 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1304, Invalid=7068, Unknown=0, NotChecked=0, Total=8372 [2022-11-22 02:00:31,363 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 254 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 290 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:31,363 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [254 Valid, 290 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:31,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2022-11-22 02:00:31,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 70. [2022-11-22 02:00:31,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 69 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:31,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2022-11-22 02:00:31,706 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 56 [2022-11-22 02:00:31,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:31,707 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2022-11-22 02:00:31,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.25531914893617) internal successors, (106), 46 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) [2022-11-22 02:00:31,707 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2022-11-22 02:00:31,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-22 02:00:31,707 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:31,707 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:31,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2022-11-22 02:00:31,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2022-11-22 02:00:31,908 INFO L420 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:31,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:31,908 INFO L85 PathProgramCache]: Analyzing trace with hash 266445003, now seen corresponding path program 12 times [2022-11-22 02:00:31,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:31,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339024760] [2022-11-22 02:00:31,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:31,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:31,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:32,312 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 188 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:32,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:32,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339024760] [2022-11-22 02:00:32,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339024760] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:32,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635736650] [2022-11-22 02:00:32,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:32,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:32,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:32,314 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:32,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-11-22 02:00:32,377 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:32,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:32,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-22 02:00:32,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:32,965 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:32,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:33,364 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 222 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:33,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635736650] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:33,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [586243646] [2022-11-22 02:00:33,365 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:33,365 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:33,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:33,365 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:33,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:33,456 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:34,165 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82822#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:34,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:34,166 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:34,166 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 45 [2022-11-22 02:00:34,166 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245458486] [2022-11-22 02:00:34,166 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:34,166 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-22 02:00:34,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:34,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-22 02:00:34,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=2379, Unknown=0, NotChecked=0, Total=2862 [2022-11-22 02:00:34,168 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:38,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:38,579 INFO L93 Difference]: Finished difference Result 724 states and 753 transitions. [2022-11-22 02:00:38,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-22 02:00:38,579 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-11-22 02:00:38,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:38,580 INFO L225 Difference]: With dead ends: 724 [2022-11-22 02:00:38,580 INFO L226 Difference]: Without dead ends: 682 [2022-11-22 02:00:38,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 117 SyntacticMatches, 25 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2247 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1058, Invalid=5262, Unknown=0, NotChecked=0, Total=6320 [2022-11-22 02:00:38,581 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 274 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 274 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 358 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:38,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [274 Valid, 207 Invalid, 358 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:38,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2022-11-22 02:00:38,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 71. [2022-11-22 02:00:38,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2285714285714286) internal successors, (86), 70 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:38,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 86 transitions. [2022-11-22 02:00:38,934 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 86 transitions. Word has length 56 [2022-11-22 02:00:38,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:38,934 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 86 transitions. [2022-11-22 02:00:38,935 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.260869565217391) internal successors, (104), 45 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:38,935 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 86 transitions. [2022-11-22 02:00:38,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-11-22 02:00:38,935 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:38,935 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:38,940 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2022-11-22 02:00:39,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2022-11-22 02:00:39,139 INFO L420 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:39,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:39,139 INFO L85 PathProgramCache]: Analyzing trace with hash 618943759, now seen corresponding path program 24 times [2022-11-22 02:00:39,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:39,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129651473] [2022-11-22 02:00:39,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:39,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:39,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:39,357 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:39,357 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:39,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129651473] [2022-11-22 02:00:39,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129651473] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:39,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651242166] [2022-11-22 02:00:39,357 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:39,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:39,358 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:39,358 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:39,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2022-11-22 02:00:39,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:39,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:39,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:00:39,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:39,507 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:39,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:39,742 INFO L134 CoverageAnalysis]: Checked inductivity of 313 backedges. 91 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:39,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651242166] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:39,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1219556476] [2022-11-22 02:00:39,744 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:39,744 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:39,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:39,744 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:39,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:39,826 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:40,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '84580#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:40,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:40,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:40,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 17 [2022-11-22 02:00:40,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350837825] [2022-11-22 02:00:40,231 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:40,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-22 02:00:40,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:40,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-22 02:00:40,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=492, Unknown=0, NotChecked=0, Total=650 [2022-11-22 02:00:40,232 INFO L87 Difference]: Start difference. First operand 71 states and 86 transitions. Second operand has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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) [2022-11-22 02:00:41,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:41,082 INFO L93 Difference]: Finished difference Result 82 states and 97 transitions. [2022-11-22 02:00:41,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-22 02:00:41,082 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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 57 [2022-11-22 02:00:41,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:41,083 INFO L225 Difference]: With dead ends: 82 [2022-11-22 02:00:41,083 INFO L226 Difference]: Without dead ends: 80 [2022-11-22 02:00:41,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 147 SyntacticMatches, 26 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=431, Invalid=1209, Unknown=0, NotChecked=0, Total=1640 [2022-11-22 02:00:41,083 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 100 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:41,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 23 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-22 02:00:41,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-22 02:00:41,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 74. [2022-11-22 02:00:41,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.2191780821917808) internal successors, (89), 73 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:41,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2022-11-22 02:00:41,436 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 57 [2022-11-22 02:00:41,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:41,437 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2022-11-22 02:00:41,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 3.2777777777777777) internal successors, (59), 17 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) [2022-11-22 02:00:41,437 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2022-11-22 02:00:41,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:00:41,437 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:41,437 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:41,442 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2022-11-22 02:00:41,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2022-11-22 02:00:41,642 INFO L420 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:41,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:41,642 INFO L85 PathProgramCache]: Analyzing trace with hash 663765761, now seen corresponding path program 25 times [2022-11-22 02:00:41,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:41,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1651398588] [2022-11-22 02:00:41,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:41,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:41,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:42,129 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:42,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:42,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1651398588] [2022-11-22 02:00:42,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1651398588] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:42,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884102327] [2022-11-22 02:00:42,130 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:00:42,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:42,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:42,139 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:42,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2022-11-22 02:00:42,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:42,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:00:42,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:43,162 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:43,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:43,633 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:43,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884102327] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:43,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029942397] [2022-11-22 02:00:43,634 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:43,635 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:43,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:43,635 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:43,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:43,715 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:44,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85303#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:44,320 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:44,320 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:44,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 61 [2022-11-22 02:00:44,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750762577] [2022-11-22 02:00:44,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:44,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-22 02:00:44,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:44,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-22 02:00:44,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=766, Invalid=4064, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 02:00:44,322 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:46,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:46,080 INFO L93 Difference]: Finished difference Result 176 states and 193 transitions. [2022-11-22 02:00:46,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-22 02:00:46,081 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:00:46,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:46,081 INFO L225 Difference]: With dead ends: 176 [2022-11-22 02:00:46,081 INFO L226 Difference]: Without dead ends: 131 [2022-11-22 02:00:46,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 113 SyntacticMatches, 27 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4420 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1511, Invalid=7995, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 02:00:46,082 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 59 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:46,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 181 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:46,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-11-22 02:00:46,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 75. [2022-11-22 02:00:46,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:00:46,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:00:46,473 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:00:46,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:46,473 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:00:46,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0) internal successors, (124), 61 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:46,473 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:00:46,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:00:46,473 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:46,474 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:46,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2022-11-22 02:00:46,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable104 [2022-11-22 02:00:46,674 INFO L420 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:46,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:46,674 INFO L85 PathProgramCache]: Analyzing trace with hash -1896393838, now seen corresponding path program 67 times [2022-11-22 02:00:46,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:46,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767447652] [2022-11-22 02:00:46,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:46,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:46,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:47,154 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:47,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:47,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767447652] [2022-11-22 02:00:47,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767447652] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:47,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277061147] [2022-11-22 02:00:47,155 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:00:47,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:47,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:47,158 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:47,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2022-11-22 02:00:47,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:47,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:00:47,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:48,116 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:48,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:48,570 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:48,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277061147] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:48,570 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1773742427] [2022-11-22 02:00:48,571 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:48,571 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:48,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:48,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:48,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:48,661 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:49,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '86214#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:49,241 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:49,241 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:49,241 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-11-22 02:00:49,241 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568524801] [2022-11-22 02:00:49,241 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:49,242 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:00:49,242 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:49,242 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:00:49,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=3978, Unknown=0, NotChecked=0, Total=4692 [2022-11-22 02:00:49,242 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:51,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:51,732 INFO L93 Difference]: Finished difference Result 232 states and 250 transitions. [2022-11-22 02:00:51,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:00:51,732 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:00:51,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:51,733 INFO L225 Difference]: With dead ends: 232 [2022-11-22 02:00:51,733 INFO L226 Difference]: Without dead ends: 187 [2022-11-22 02:00:51,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 114 SyntacticMatches, 27 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5174 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2022-11-22 02:00:51,734 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 83 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 446 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 446 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:51,734 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 230 Invalid, 465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 446 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:51,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-11-22 02:00:52,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 75. [2022-11-22 02:00:52,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:00:52,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:00:52,146 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:00:52,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:52,146 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:00:52,146 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.0327868852459017) internal successors, (124), 60 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:00:52,146 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:00:52,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:00:52,146 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:52,146 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:52,150 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Ended with exit code 0 [2022-11-22 02:00:52,347 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:52,347 INFO L420 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:52,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:52,347 INFO L85 PathProgramCache]: Analyzing trace with hash -1424790303, now seen corresponding path program 68 times [2022-11-22 02:00:52,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:52,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914777632] [2022-11-22 02:00:52,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:52,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:52,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:52,814 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:52,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:52,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914777632] [2022-11-22 02:00:52,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914777632] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:52,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175499780] [2022-11-22 02:00:52,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:00:52,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:52,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:52,816 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:52,818 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2022-11-22 02:00:52,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:00:52,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:52,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:00:52,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:00:53,805 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:53,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:00:54,251 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:54,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175499780] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:00:54,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [571956932] [2022-11-22 02:00:54,252 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:00:54,252 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:00:54,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:00:54,252 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:00:54,252 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:00:54,335 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:00:54,905 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '87244#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:00:54,906 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:00:54,906 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:00:54,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 59 [2022-11-22 02:00:54,906 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429929648] [2022-11-22 02:00:54,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:00:54,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-22 02:00:54,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:00:54,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-22 02:00:54,907 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=678, Invalid=3878, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 02:00:54,907 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 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) [2022-11-22 02:00:58,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:00:58,045 INFO L93 Difference]: Finished difference Result 287 states and 306 transitions. [2022-11-22 02:00:58,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 02:00:58,045 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 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) Word has length 60 [2022-11-22 02:00:58,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:00:58,045 INFO L225 Difference]: With dead ends: 287 [2022-11-22 02:00:58,045 INFO L226 Difference]: Without dead ends: 242 [2022-11-22 02:00:58,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 115 SyntacticMatches, 27 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5845 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2022-11-22 02:00:58,046 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 73 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 264 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:00:58,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 264 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:00:58,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2022-11-22 02:00:58,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 75. [2022-11-22 02:00:58,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:00:58,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:00:58,468 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:00:58,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:00:58,468 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:00:58,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.05) internal successors, (123), 59 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) [2022-11-22 02:00:58,468 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:00:58,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:00:58,468 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:00:58,469 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:00:58,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2022-11-22 02:00:58,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:58,669 INFO L420 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:00:58,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:00:58,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1686671950, now seen corresponding path program 69 times [2022-11-22 02:00:58,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:00:58,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [128816526] [2022-11-22 02:00:58,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:00:58,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:00:58,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:00:59,146 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:00:59,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:00:59,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [128816526] [2022-11-22 02:00:59,147 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [128816526] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:00:59,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092441299] [2022-11-22 02:00:59,147 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:00:59,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:00:59,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:00:59,148 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:00:59,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2022-11-22 02:00:59,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:00:59,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:00:59,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:00:59,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:00,067 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:00,067 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:00,508 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:00,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092441299] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:00,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [861510447] [2022-11-22 02:01:00,509 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:00,510 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:00,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:00,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:00,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:00,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:01,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88387#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:01,172 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:01,172 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:01,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 58 [2022-11-22 02:01:01,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521208005] [2022-11-22 02:01:01,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:01,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:01:01,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:01,173 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:01:01,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=646, Invalid=3776, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:01:01,174 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 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) [2022-11-22 02:01:04,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:04,956 INFO L93 Difference]: Finished difference Result 341 states and 361 transitions. [2022-11-22 02:01:04,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-22 02:01:04,956 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 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) Word has length 60 [2022-11-22 02:01:04,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:04,956 INFO L225 Difference]: With dead ends: 341 [2022-11-22 02:01:04,956 INFO L226 Difference]: Without dead ends: 296 [2022-11-22 02:01:04,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 116 SyntacticMatches, 27 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6403 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2022-11-22 02:01:04,957 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 167 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:04,957 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 202 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:01:04,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2022-11-22 02:01:05,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 75. [2022-11-22 02:01:05,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:05,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:05,395 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:05,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:05,395 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:05,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.0677966101694913) internal successors, (122), 58 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) [2022-11-22 02:01:05,395 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:05,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:05,395 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:05,395 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:05,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2022-11-22 02:01:05,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2022-11-22 02:01:05,599 INFO L420 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:05,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:05,599 INFO L85 PathProgramCache]: Analyzing trace with hash 521637569, now seen corresponding path program 70 times [2022-11-22 02:01:05,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:05,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123004585] [2022-11-22 02:01:05,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:05,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:05,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:06,060 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:06,061 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:06,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123004585] [2022-11-22 02:01:06,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123004585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:06,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918827209] [2022-11-22 02:01:06,061 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:01:06,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:06,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:06,062 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:06,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2022-11-22 02:01:06,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:06,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:06,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:06,958 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:06,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:07,395 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:07,395 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918827209] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:07,395 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1596000866] [2022-11-22 02:01:07,396 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:07,396 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:07,396 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:07,396 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:07,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:07,479 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:08,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '89637#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:08,056 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:08,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:08,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 57 [2022-11-22 02:01:08,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [557944193] [2022-11-22 02:01:08,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:08,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 02:01:08,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:08,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 02:01:08,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:01:08,057 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 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) [2022-11-22 02:01:12,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:12,419 INFO L93 Difference]: Finished difference Result 394 states and 415 transitions. [2022-11-22 02:01:12,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-22 02:01:12,419 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 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) Word has length 60 [2022-11-22 02:01:12,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:12,420 INFO L225 Difference]: With dead ends: 394 [2022-11-22 02:01:12,420 INFO L226 Difference]: Without dead ends: 349 [2022-11-22 02:01:12,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 117 SyntacticMatches, 27 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6817 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2022-11-22 02:01:12,421 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 202 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 483 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 483 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:12,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 259 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 483 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:01:12,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2022-11-22 02:01:12,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 75. [2022-11-22 02:01:12,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:12,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:12,866 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:12,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:12,866 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:12,866 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.086206896551724) internal successors, (121), 57 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) [2022-11-22 02:01:12,866 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:12,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:12,867 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:12,867 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:12,874 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Forceful destruction successful, exit code 0 [2022-11-22 02:01:13,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable108 [2022-11-22 02:01:13,072 INFO L420 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:13,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:13,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1485336622, now seen corresponding path program 71 times [2022-11-22 02:01:13,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:13,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607415289] [2022-11-22 02:01:13,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:13,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:13,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:13,659 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:13,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:13,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607415289] [2022-11-22 02:01:13,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607415289] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:13,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614903663] [2022-11-22 02:01:13,660 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:01:13,660 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:13,660 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:13,661 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:13,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2022-11-22 02:01:13,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:01:13,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:01:13,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:13,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:14,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:15,051 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:15,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614903663] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:15,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563439108] [2022-11-22 02:01:15,052 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:15,053 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:15,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:15,053 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:15,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:15,135 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:15,697 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '90988#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:15,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:15,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:15,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 56 [2022-11-22 02:01:15,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483307857] [2022-11-22 02:01:15,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:15,697 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-22 02:01:15,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:15,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-22 02:01:15,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=594, Invalid=3566, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 02:01:15,698 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:20,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:20,512 INFO L93 Difference]: Finished difference Result 446 states and 468 transitions. [2022-11-22 02:01:20,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-22 02:01:20,513 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 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 [2022-11-22 02:01:20,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:20,513 INFO L225 Difference]: With dead ends: 446 [2022-11-22 02:01:20,513 INFO L226 Difference]: Without dead ends: 401 [2022-11-22 02:01:20,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 118 SyntacticMatches, 27 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7054 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2022-11-22 02:01:20,514 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 149 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:20,515 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [149 Valid, 300 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:01:20,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2022-11-22 02:01:20,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 75. [2022-11-22 02:01:20,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:20,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:20,955 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:20,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:20,955 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:20,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.1052631578947367) internal successors, (120), 56 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:20,955 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:20,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:20,956 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:20,956 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:20,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2022-11-22 02:01:21,156 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:21,156 INFO L420 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:21,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:21,156 INFO L85 PathProgramCache]: Analyzing trace with hash 528132257, now seen corresponding path program 72 times [2022-11-22 02:01:21,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:21,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985270751] [2022-11-22 02:01:21,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:21,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:21,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:21,627 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:21,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:21,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985270751] [2022-11-22 02:01:21,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985270751] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:21,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838119254] [2022-11-22 02:01:21,628 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:01:21,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:21,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:21,629 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:21,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2022-11-22 02:01:21,695 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:01:21,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:01:21,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:21,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:22,485 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:22,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:22,914 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:22,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838119254] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:22,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [277518794] [2022-11-22 02:01:22,915 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:22,915 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:22,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:22,915 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:22,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:22,999 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:23,558 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '92434#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:23,559 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:23,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:23,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 55 [2022-11-22 02:01:23,559 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276982827] [2022-11-22 02:01:23,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:23,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-22 02:01:23,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:23,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-22 02:01:23,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=574, Invalid=3458, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:01:23,560 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:28,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:28,798 INFO L93 Difference]: Finished difference Result 497 states and 520 transitions. [2022-11-22 02:01:28,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-11-22 02:01:28,798 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:01:28,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:28,799 INFO L225 Difference]: With dead ends: 497 [2022-11-22 02:01:28,799 INFO L226 Difference]: Without dead ends: 452 [2022-11-22 02:01:28,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 119 SyntacticMatches, 27 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7093 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2754, Invalid=15068, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:01:28,800 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 262 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 525 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 525 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:28,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 292 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 525 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:01:28,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2022-11-22 02:01:29,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 75. [2022-11-22 02:01:29,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:29,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:29,308 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:29,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:29,308 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:29,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.125) internal successors, (119), 55 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:29,309 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:29,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:29,309 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:29,309 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:29,315 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Ended with exit code 0 [2022-11-22 02:01:29,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:29,515 INFO L420 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:29,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:29,515 INFO L85 PathProgramCache]: Analyzing trace with hash 593082866, now seen corresponding path program 73 times [2022-11-22 02:01:29,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:29,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25441931] [2022-11-22 02:01:29,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:29,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:29,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:30,018 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 223 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:30,018 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:30,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25441931] [2022-11-22 02:01:30,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25441931] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:30,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069766351] [2022-11-22 02:01:30,019 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:01:30,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:30,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:30,020 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:30,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2022-11-22 02:01:30,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:30,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:30,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:30,879 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:30,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:31,304 INFO L134 CoverageAnalysis]: Checked inductivity of 309 backedges. 260 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:31,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069766351] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:31,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542932797] [2022-11-22 02:01:31,305 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:31,305 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:31,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:31,305 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:31,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:31,389 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:31,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '93969#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:31,946 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:31,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:31,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 54 [2022-11-22 02:01:31,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974700369] [2022-11-22 02:01:31,947 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:31,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 02:01:31,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:31,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 02:01:31,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=558, Invalid=3348, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 02:01:31,948 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:37,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:37,494 INFO L93 Difference]: Finished difference Result 547 states and 571 transitions. [2022-11-22 02:01:37,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-11-22 02:01:37,494 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:01:37,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:37,494 INFO L225 Difference]: With dead ends: 547 [2022-11-22 02:01:37,495 INFO L226 Difference]: Without dead ends: 502 [2022-11-22 02:01:37,495 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 120 SyntacticMatches, 27 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6925 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2710, Invalid=14846, Unknown=0, NotChecked=0, Total=17556 [2022-11-22 02:01:37,496 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 180 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:37,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 344 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:01:37,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-11-22 02:01:37,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 75. [2022-11-22 02:01:37,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:37,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:37,952 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:37,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:37,952 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:37,952 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.1454545454545455) internal successors, (118), 54 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:37,952 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:37,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:37,952 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:37,953 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:37,957 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Forceful destruction successful, exit code 0 [2022-11-22 02:01:38,153 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2022-11-22 02:01:38,153 INFO L420 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:38,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:38,153 INFO L85 PathProgramCache]: Analyzing trace with hash -1483031935, now seen corresponding path program 74 times [2022-11-22 02:01:38,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:38,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661561192] [2022-11-22 02:01:38,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:38,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:38,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:38,603 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 223 proven. 88 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:38,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:38,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661561192] [2022-11-22 02:01:38,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661561192] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:38,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979160785] [2022-11-22 02:01:38,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:01:38,603 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:38,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:38,604 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:38,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2022-11-22 02:01:38,680 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:01:38,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:01:38,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:38,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:39,433 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:39,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:39,855 INFO L134 CoverageAnalysis]: Checked inductivity of 311 backedges. 260 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:39,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979160785] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:39,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1196787325] [2022-11-22 02:01:39,856 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:39,856 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:39,856 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:39,856 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:39,857 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:39,939 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:40,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95587#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:40,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:40,494 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:40,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 53 [2022-11-22 02:01:40,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372462182] [2022-11-22 02:01:40,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:40,495 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 02:01:40,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:40,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 02:01:40,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=546, Invalid=3236, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:01:40,496 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:46,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:46,265 INFO L93 Difference]: Finished difference Result 596 states and 621 transitions. [2022-11-22 02:01:46,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-11-22 02:01:46,265 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 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 [2022-11-22 02:01:46,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:46,266 INFO L225 Difference]: With dead ends: 596 [2022-11-22 02:01:46,266 INFO L226 Difference]: Without dead ends: 551 [2022-11-22 02:01:46,267 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 121 SyntacticMatches, 27 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6553 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2581, Invalid=14189, Unknown=0, NotChecked=0, Total=16770 [2022-11-22 02:01:46,267 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 223 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 520 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 520 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:46,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 318 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 520 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:01:46,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-11-22 02:01:46,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 75. [2022-11-22 02:01:46,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:46,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:46,725 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:46,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:46,725 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:46,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.1666666666666665) internal successors, (117), 53 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:46,725 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:46,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:46,725 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:46,726 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:46,730 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Forceful destruction successful, exit code 0 [2022-11-22 02:01:46,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2022-11-22 02:01:46,926 INFO L420 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:46,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:46,926 INFO L85 PathProgramCache]: Analyzing trace with hash 805301266, now seen corresponding path program 75 times [2022-11-22 02:01:46,926 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:46,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878725372] [2022-11-22 02:01:46,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:46,927 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:46,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:47,413 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 223 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:47,413 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:47,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878725372] [2022-11-22 02:01:47,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878725372] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:47,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954744054] [2022-11-22 02:01:47,414 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:01:47,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:47,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:47,415 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:47,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2022-11-22 02:01:47,480 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:01:47,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:01:47,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:47,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:48,207 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:48,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:48,630 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 260 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:48,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954744054] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:48,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [728323042] [2022-11-22 02:01:48,635 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:48,635 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:48,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:48,635 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:48,636 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:48,759 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:49,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97282#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:49,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:49,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:49,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 52 [2022-11-22 02:01:49,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356973996] [2022-11-22 02:01:49,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:49,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 02:01:49,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:49,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 02:01:49,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=3122, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:01:49,346 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:55,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:01:55,357 INFO L93 Difference]: Finished difference Result 644 states and 670 transitions. [2022-11-22 02:01:55,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-11-22 02:01:55,358 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 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 [2022-11-22 02:01:55,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:01:55,358 INFO L225 Difference]: With dead ends: 644 [2022-11-22 02:01:55,358 INFO L226 Difference]: Without dead ends: 599 [2022-11-22 02:01:55,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 122 SyntacticMatches, 27 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5992 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=2376, Invalid=13124, Unknown=0, NotChecked=0, Total=15500 [2022-11-22 02:01:55,359 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 264 mSDsluCounter, 251 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:01:55,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [264 Valid, 273 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:01:55,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2022-11-22 02:01:55,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 75. [2022-11-22 02:01:55,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:01:55,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:01:55,832 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:01:55,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:01:55,832 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:01:55,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.188679245283019) internal successors, (116), 52 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:01:55,832 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:01:55,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:01:55,832 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:01:55,833 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:01:55,837 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2022-11-22 02:01:56,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2022-11-22 02:01:56,033 INFO L420 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:01:56,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:01:56,033 INFO L85 PathProgramCache]: Analyzing trace with hash -229260191, now seen corresponding path program 76 times [2022-11-22 02:01:56,033 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:01:56,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823562363] [2022-11-22 02:01:56,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:01:56,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:01:56,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:56,481 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 223 proven. 98 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:56,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:01:56,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823562363] [2022-11-22 02:01:56,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823562363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:01:56,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1176624818] [2022-11-22 02:01:56,481 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:01:56,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:01:56,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:01:56,482 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:01:56,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2022-11-22 02:01:56,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:01:56,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:01:56,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:01:57,242 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:57,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:01:57,671 INFO L134 CoverageAnalysis]: Checked inductivity of 321 backedges. 260 proven. 61 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:01:57,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1176624818] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:01:57,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1186392518] [2022-11-22 02:01:57,672 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:01:57,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:01:57,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:01:57,673 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:01:57,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:01:57,755 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:01:58,310 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99048#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:01:58,311 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:01:58,311 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:01:58,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2022-11-22 02:01:58,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657482546] [2022-11-22 02:01:58,311 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:01:58,311 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 02:01:58,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:01:58,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 02:01:58,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=3006, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 02:01:58,312 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:04,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:04,177 INFO L93 Difference]: Finished difference Result 691 states and 718 transitions. [2022-11-22 02:02:04,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-11-22 02:02:04,178 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:02:04,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:04,178 INFO L225 Difference]: With dead ends: 691 [2022-11-22 02:02:04,178 INFO L226 Difference]: Without dead ends: 646 [2022-11-22 02:02:04,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 123 SyntacticMatches, 27 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5269 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2110, Invalid=11696, Unknown=0, NotChecked=0, Total=13806 [2022-11-22 02:02:04,179 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 408 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 408 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:04,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [408 Valid, 238 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:04,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2022-11-22 02:02:04,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 75. [2022-11-22 02:02:04,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:02:04,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:02:04,657 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:02:04,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:04,657 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:02:04,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.2115384615384617) internal successors, (115), 51 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:04,657 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:02:04,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:02:04,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:04,658 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:04,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:04,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2022-11-22 02:02:04,863 INFO L420 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:04,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:04,863 INFO L85 PathProgramCache]: Analyzing trace with hash -1093917134, now seen corresponding path program 77 times [2022-11-22 02:02:04,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:04,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860746674] [2022-11-22 02:02:04,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:04,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:04,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:05,305 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 223 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:05,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:05,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860746674] [2022-11-22 02:02:05,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860746674] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:05,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665063691] [2022-11-22 02:02:05,305 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:05,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:05,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:05,306 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:05,308 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2022-11-22 02:02:05,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:02:05,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:05,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:02:05,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:06,063 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:06,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:06,480 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 260 proven. 69 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:06,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665063691] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:06,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1763533996] [2022-11-22 02:02:06,481 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:06,481 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:06,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:06,481 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:06,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:06,564 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:07,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100879#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:07,106 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:07,106 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:07,106 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 50 [2022-11-22 02:02:07,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304910644] [2022-11-22 02:02:07,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:07,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-22 02:02:07,107 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:07,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-22 02:02:07,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=2888, Unknown=0, NotChecked=0, Total=3422 [2022-11-22 02:02:07,107 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 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) [2022-11-22 02:02:13,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:13,086 INFO L93 Difference]: Finished difference Result 737 states and 765 transitions. [2022-11-22 02:02:13,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-11-22 02:02:13,086 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 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) Word has length 60 [2022-11-22 02:02:13,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:13,087 INFO L225 Difference]: With dead ends: 737 [2022-11-22 02:02:13,087 INFO L226 Difference]: Without dead ends: 692 [2022-11-22 02:02:13,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 124 SyntacticMatches, 27 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4423 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1804, Invalid=9968, Unknown=0, NotChecked=0, Total=11772 [2022-11-22 02:02:13,088 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 312 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 312 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:13,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [312 Valid, 279 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:13,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2022-11-22 02:02:13,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 75. [2022-11-22 02:02:13,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:02:13,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:02:13,552 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:02:13,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:13,552 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:02:13,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.235294117647059) internal successors, (114), 50 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) [2022-11-22 02:02:13,552 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:02:13,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:02:13,552 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:13,553 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:13,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2022-11-22 02:02:13,753 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable115 [2022-11-22 02:02:13,753 INFO L420 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:13,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:13,753 INFO L85 PathProgramCache]: Analyzing trace with hash 1510590017, now seen corresponding path program 78 times [2022-11-22 02:02:13,753 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:13,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369580010] [2022-11-22 02:02:13,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:13,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:13,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:14,203 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 223 proven. 116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:14,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:14,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369580010] [2022-11-22 02:02:14,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369580010] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:14,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492691275] [2022-11-22 02:02:14,204 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:02:14,204 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:14,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:14,205 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:14,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2022-11-22 02:02:14,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:02:14,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:14,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:02:14,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:14,925 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:14,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:15,343 INFO L134 CoverageAnalysis]: Checked inductivity of 339 backedges. 260 proven. 79 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:15,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492691275] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:15,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [660481243] [2022-11-22 02:02:15,344 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:15,344 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:15,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:15,344 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:15,344 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:15,424 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:15,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102769#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:15,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:15,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:15,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2022-11-22 02:02:15,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617096880] [2022-11-22 02:02:15,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:15,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-22 02:02:15,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:15,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-22 02:02:15,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=538, Invalid=2768, Unknown=0, NotChecked=0, Total=3306 [2022-11-22 02:02:15,966 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 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) [2022-11-22 02:02:21,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:21,943 INFO L93 Difference]: Finished difference Result 782 states and 811 transitions. [2022-11-22 02:02:21,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-11-22 02:02:21,943 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:02:21,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:21,944 INFO L225 Difference]: With dead ends: 782 [2022-11-22 02:02:21,944 INFO L226 Difference]: Without dead ends: 737 [2022-11-22 02:02:21,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 125 SyntacticMatches, 27 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3477 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1485, Invalid=8021, Unknown=0, NotChecked=0, Total=9506 [2022-11-22 02:02:21,946 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 307 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 417 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 307 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:21,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [307 Valid, 269 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 417 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:21,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 737 states. [2022-11-22 02:02:22,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 737 to 75. [2022-11-22 02:02:22,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.2162162162162162) internal successors, (90), 74 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) [2022-11-22 02:02:22,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 90 transitions. [2022-11-22 02:02:22,425 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 90 transitions. Word has length 60 [2022-11-22 02:02:22,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:22,425 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 90 transitions. [2022-11-22 02:02:22,425 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.26) internal successors, (113), 49 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) [2022-11-22 02:02:22,425 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 90 transitions. [2022-11-22 02:02:22,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-11-22 02:02:22,425 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:22,426 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:22,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:22,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:22,626 INFO L420 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:22,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:22,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1314887598, now seen corresponding path program 13 times [2022-11-22 02:02:22,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:22,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233984421] [2022-11-22 02:02:22,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:22,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:22,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 223 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:23,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:23,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233984421] [2022-11-22 02:02:23,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233984421] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:23,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385718443] [2022-11-22 02:02:23,075 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:02:23,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:23,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:23,076 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:23,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2022-11-22 02:02:23,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:23,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-22 02:02:23,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:23,782 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:23,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:24,211 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 260 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:24,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385718443] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:24,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [14189724] [2022-11-22 02:02:24,212 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:24,212 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:24,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:24,212 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:24,212 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:24,285 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:24,957 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104712#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:24,957 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:24,958 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:24,958 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 48 [2022-11-22 02:02:24,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687722091] [2022-11-22 02:02:24,958 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:24,958 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-22 02:02:24,958 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:24,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-22 02:02:24,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=2647, Unknown=0, NotChecked=0, Total=3192 [2022-11-22 02:02:24,959 INFO L87 Difference]: Start difference. First operand 75 states and 90 transitions. Second operand has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:30,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:30,960 INFO L93 Difference]: Finished difference Result 828 states and 859 transitions. [2022-11-22 02:02:30,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-22 02:02:30,960 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-11-22 02:02:30,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:30,961 INFO L225 Difference]: With dead ends: 828 [2022-11-22 02:02:30,961 INFO L226 Difference]: Without dead ends: 783 [2022-11-22 02:02:30,962 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 126 SyntacticMatches, 27 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2553 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1199, Invalid=5941, Unknown=0, NotChecked=0, Total=7140 [2022-11-22 02:02:30,962 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 386 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 386 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:30,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [386 Valid, 204 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:30,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2022-11-22 02:02:31,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 76. [2022-11-22 02:02:31,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.2266666666666666) internal successors, (92), 75 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:31,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 92 transitions. [2022-11-22 02:02:31,443 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 92 transitions. Word has length 60 [2022-11-22 02:02:31,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:31,443 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 92 transitions. [2022-11-22 02:02:31,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 48 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:31,443 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 92 transitions. [2022-11-22 02:02:31,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-22 02:02:31,443 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:31,443 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:31,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Ended with exit code 0 [2022-11-22 02:02:31,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117,117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:31,644 INFO L420 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:31,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:31,644 INFO L85 PathProgramCache]: Analyzing trace with hash 173062277, now seen corresponding path program 26 times [2022-11-22 02:02:31,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:31,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349500241] [2022-11-22 02:02:31,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:31,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:31,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:31,886 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:31,886 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:31,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349500241] [2022-11-22 02:02:31,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349500241] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:31,886 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1038900565] [2022-11-22 02:02:31,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:31,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:31,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:31,887 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:31,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2022-11-22 02:02:31,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-22 02:02:31,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:31,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:02:31,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:32,052 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:32,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:32,311 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 105 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:32,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1038900565] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:32,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044358512] [2022-11-22 02:02:32,312 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:32,313 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:32,313 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:32,313 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:32,313 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:32,379 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:32,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '106685#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:32,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:32,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:32,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 18 [2022-11-22 02:02:32,781 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369927231] [2022-11-22 02:02:32,781 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:32,781 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-11-22 02:02:32,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:32,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-11-22 02:02:32,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=528, Unknown=0, NotChecked=0, Total=702 [2022-11-22 02:02:32,781 INFO L87 Difference]: Start difference. First operand 76 states and 92 transitions. Second operand has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 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) [2022-11-22 02:02:33,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:33,829 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2022-11-22 02:02:33,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-22 02:02:33,829 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 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 61 [2022-11-22 02:02:33,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:33,830 INFO L225 Difference]: With dead ends: 87 [2022-11-22 02:02:33,830 INFO L226 Difference]: Without dead ends: 85 [2022-11-22 02:02:33,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 158 SyntacticMatches, 28 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=481, Invalid=1325, Unknown=0, NotChecked=0, Total=1806 [2022-11-22 02:02:33,830 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 106 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 298 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 298 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:33,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 30 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 298 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:33,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-22 02:02:34,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2022-11-22 02:02:34,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 78 states have (on average 1.2179487179487178) internal successors, (95), 78 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:34,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2022-11-22 02:02:34,321 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 61 [2022-11-22 02:02:34,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:34,321 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2022-11-22 02:02:34,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.3157894736842106) internal successors, (63), 18 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) [2022-11-22 02:02:34,322 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2022-11-22 02:02:34,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:02:34,322 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:34,322 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:34,327 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:34,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2022-11-22 02:02:34,523 INFO L420 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:34,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:34,523 INFO L85 PathProgramCache]: Analyzing trace with hash 1742382027, now seen corresponding path program 27 times [2022-11-22 02:02:34,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:34,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457196276] [2022-11-22 02:02:34,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:34,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:34,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:35,051 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:35,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:35,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457196276] [2022-11-22 02:02:35,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457196276] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:35,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146600003] [2022-11-22 02:02:35,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:02:35,051 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:35,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:35,052 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:35,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2022-11-22 02:02:35,120 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:02:35,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:35,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:02:35,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:36,143 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:36,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:36,670 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:36,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146600003] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:36,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311051336] [2022-11-22 02:02:36,672 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:36,672 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:36,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:36,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:36,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:36,751 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:37,374 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '107456#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:37,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:37,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:37,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 65 [2022-11-22 02:02:37,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213852179] [2022-11-22 02:02:37,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:37,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-22 02:02:37,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:37,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-22 02:02:37,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=862, Invalid=4540, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 02:02:37,376 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 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) [2022-11-22 02:02:39,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:39,563 INFO L93 Difference]: Finished difference Result 188 states and 206 transitions. [2022-11-22 02:02:39,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-22 02:02:39,563 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 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) Word has length 64 [2022-11-22 02:02:39,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:39,563 INFO L225 Difference]: With dead ends: 188 [2022-11-22 02:02:39,563 INFO L226 Difference]: Without dead ends: 140 [2022-11-22 02:02:39,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 121 SyntacticMatches, 29 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5021 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1705, Invalid=9007, Unknown=0, NotChecked=0, Total=10712 [2022-11-22 02:02:39,564 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 61 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 473 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:39,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 251 Invalid, 473 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:39,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-11-22 02:02:40,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 80. [2022-11-22 02:02:40,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:40,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:02:40,097 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:02:40,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:40,097 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:02:40,097 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0) internal successors, (132), 65 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) [2022-11-22 02:02:40,097 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:02:40,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:02:40,097 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:40,098 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:40,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Forceful destruction successful, exit code 0 [2022-11-22 02:02:40,302 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable119 [2022-11-22 02:02:40,302 INFO L420 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:40,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:40,302 INFO L85 PathProgramCache]: Analyzing trace with hash -1389034532, now seen corresponding path program 79 times [2022-11-22 02:02:40,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:40,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397908978] [2022-11-22 02:02:40,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:40,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:40,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:40,824 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 261 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:40,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:40,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397908978] [2022-11-22 02:02:40,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397908978] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:40,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57112194] [2022-11-22 02:02:40,825 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:02:40,825 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:40,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:40,826 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:40,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2022-11-22 02:02:40,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:40,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:02:40,894 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:41,891 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:41,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:42,391 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:42,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57112194] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:42,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1301980741] [2022-11-22 02:02:42,392 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:42,392 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:42,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:42,392 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:42,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:42,472 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:43,056 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '108429#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:43,056 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:43,056 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:43,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 64 [2022-11-22 02:02:43,056 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243906034] [2022-11-22 02:02:43,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:43,056 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-22 02:02:43,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:43,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-22 02:02:43,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=807, Invalid=4449, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:02:43,057 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 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) [2022-11-22 02:02:46,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:46,143 INFO L93 Difference]: Finished difference Result 248 states and 267 transitions. [2022-11-22 02:02:46,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 02:02:46,144 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 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) Word has length 64 [2022-11-22 02:02:46,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:46,144 INFO L225 Difference]: With dead ends: 248 [2022-11-22 02:02:46,144 INFO L226 Difference]: Without dead ends: 200 [2022-11-22 02:02:46,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 122 SyntacticMatches, 29 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5905 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=2050, Invalid=11290, Unknown=0, NotChecked=0, Total=13340 [2022-11-22 02:02:46,145 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 108 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:46,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 187 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:02:46,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-11-22 02:02:46,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 80. [2022-11-22 02:02:46,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:46,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:02:46,718 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:02:46,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:46,718 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:02:46,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0307692307692307) internal successors, (132), 64 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) [2022-11-22 02:02:46,718 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:02:46,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:02:46,719 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:46,719 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:46,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2022-11-22 02:02:46,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:46,919 INFO L420 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:46,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:46,920 INFO L85 PathProgramCache]: Analyzing trace with hash -1074405973, now seen corresponding path program 80 times [2022-11-22 02:02:46,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:46,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429818130] [2022-11-22 02:02:46,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:46,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:46,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:47,436 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 261 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:47,436 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:47,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429818130] [2022-11-22 02:02:47,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429818130] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:47,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264120873] [2022-11-22 02:02:47,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:02:47,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:47,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:47,438 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:47,440 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2022-11-22 02:02:47,518 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:02:47,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:47,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:02:47,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:48,497 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:48,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:49,010 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:49,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264120873] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:49,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1151963708] [2022-11-22 02:02:49,011 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:49,012 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:49,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:49,012 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:49,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:49,093 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:49,673 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109530#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:49,673 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:49,673 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:49,673 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 63 [2022-11-22 02:02:49,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351164480] [2022-11-22 02:02:49,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:49,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-22 02:02:49,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:49,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-22 02:02:49,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=768, Invalid=4344, Unknown=0, NotChecked=0, Total=5112 [2022-11-22 02:02:49,675 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 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) [2022-11-22 02:02:53,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:02:53,710 INFO L93 Difference]: Finished difference Result 307 states and 327 transitions. [2022-11-22 02:02:53,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 02:02:53,710 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 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) Word has length 64 [2022-11-22 02:02:53,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:02:53,711 INFO L225 Difference]: With dead ends: 307 [2022-11-22 02:02:53,711 INFO L226 Difference]: Without dead ends: 259 [2022-11-22 02:02:53,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 123 SyntacticMatches, 29 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6714 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2415, Invalid=13335, Unknown=0, NotChecked=0, Total=15750 [2022-11-22 02:02:53,713 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 83 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:02:53,713 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 340 Invalid, 660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:02:53,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-22 02:02:54,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 80. [2022-11-22 02:02:54,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:02:54,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:02:54,476 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:02:54,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:02:54,476 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:02:54,476 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.046875) internal successors, (131), 63 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) [2022-11-22 02:02:54,476 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:02:54,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:02:54,477 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:02:54,477 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:02:54,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2022-11-22 02:02:54,677 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:54,677 INFO L420 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:02:54,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:02:54,677 INFO L85 PathProgramCache]: Analyzing trace with hash -371520004, now seen corresponding path program 81 times [2022-11-22 02:02:54,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:02:54,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335894651] [2022-11-22 02:02:54,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:02:54,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:02:54,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:02:55,235 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 261 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:55,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:02:55,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335894651] [2022-11-22 02:02:55,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335894651] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:02:55,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548491034] [2022-11-22 02:02:55,236 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:02:55,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:02:55,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:02:55,237 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:02:55,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2022-11-22 02:02:55,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:02:55,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:02:55,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:02:55,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:02:56,253 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:56,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:02:56,743 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:02:56,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548491034] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:02:56,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677522119] [2022-11-22 02:02:56,744 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:02:56,744 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:02:56,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:02:56,744 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:02:56,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:02:56,834 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:02:57,426 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '110753#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:02:57,426 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:02:57,426 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:02:57,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 62 [2022-11-22 02:02:57,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181616838] [2022-11-22 02:02:57,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:02:57,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-22 02:02:57,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:02:57,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-22 02:02:57,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=733, Invalid=4237, Unknown=0, NotChecked=0, Total=4970 [2022-11-22 02:02:57,428 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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) [2022-11-22 02:03:02,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:02,285 INFO L93 Difference]: Finished difference Result 365 states and 386 transitions. [2022-11-22 02:03:02,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 02:03:02,285 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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 64 [2022-11-22 02:03:02,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:02,286 INFO L225 Difference]: With dead ends: 365 [2022-11-22 02:03:02,286 INFO L226 Difference]: Without dead ends: 317 [2022-11-22 02:03:02,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 124 SyntacticMatches, 29 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7414 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2743, Invalid=15079, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:03:02,287 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 142 mSDsluCounter, 322 mSDsCounter, 0 mSdLazyCounter, 619 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 142 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:02,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [142 Valid, 345 Invalid, 627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 619 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:03:02,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-11-22 02:03:02,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 80. [2022-11-22 02:03:02,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:02,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:02,885 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:02,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:02,886 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:02,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.0634920634920637) internal successors, (130), 62 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) [2022-11-22 02:03:02,886 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:02,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:02,886 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:02,886 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:02,890 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Ended with exit code 0 [2022-11-22 02:03:03,089 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2022-11-22 02:03:03,089 INFO L420 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:03,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:03,089 INFO L85 PathProgramCache]: Analyzing trace with hash 1867911051, now seen corresponding path program 82 times [2022-11-22 02:03:03,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:03,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52104380] [2022-11-22 02:03:03,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:03,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:03,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,604 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 261 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:03,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:03,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52104380] [2022-11-22 02:03:03,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52104380] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:03,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161076064] [2022-11-22 02:03:03,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:03:03,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:03,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:03,606 INFO L229 MonitoredProcess]: Starting monitored process 123 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:03,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Waiting until timeout for monitored process [2022-11-22 02:03:03,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:03,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:03,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:04,617 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:04,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:05,101 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:05,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161076064] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:05,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418410549] [2022-11-22 02:03:05,102 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:05,102 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:05,103 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:05,103 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:05,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:05,190 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:05,767 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112092#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:05,767 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:05,767 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:05,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 61 [2022-11-22 02:03:05,768 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846896922] [2022-11-22 02:03:05,768 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:05,768 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-22 02:03:05,768 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:05,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-22 02:03:05,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=4128, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 02:03:05,769 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:11,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:11,245 INFO L93 Difference]: Finished difference Result 422 states and 444 transitions. [2022-11-22 02:03:11,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-22 02:03:11,246 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:03:11,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:11,246 INFO L225 Difference]: With dead ends: 422 [2022-11-22 02:03:11,246 INFO L226 Difference]: Without dead ends: 374 [2022-11-22 02:03:11,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 125 SyntacticMatches, 29 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7969 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3010, Invalid=16450, Unknown=0, NotChecked=0, Total=19460 [2022-11-22 02:03:11,247 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 283 mSDsluCounter, 301 mSDsCounter, 0 mSdLazyCounter, 567 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 283 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:11,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [283 Valid, 324 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 567 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:03:11,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-11-22 02:03:11,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 80. [2022-11-22 02:03:11,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:11,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:11,843 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:11,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:11,844 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:11,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.0806451612903225) internal successors, (129), 61 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:11,844 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:11,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:11,844 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:11,844 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:11,849 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (123)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:12,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 123 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2022-11-22 02:03:12,049 INFO L420 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:12,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:12,050 INFO L85 PathProgramCache]: Analyzing trace with hash -692248548, now seen corresponding path program 83 times [2022-11-22 02:03:12,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:12,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2050898850] [2022-11-22 02:03:12,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:12,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:12,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:12,553 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 261 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:12,553 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:12,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2050898850] [2022-11-22 02:03:12,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2050898850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:12,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141497122] [2022-11-22 02:03:12,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:12,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:12,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:12,555 INFO L229 MonitoredProcess]: Starting monitored process 124 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:12,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Waiting until timeout for monitored process [2022-11-22 02:03:12,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:03:12,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:12,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:12,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:13,529 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:13,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:14,002 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:14,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141497122] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:14,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2060391904] [2022-11-22 02:03:14,003 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:14,003 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:14,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:14,003 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:14,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:14,085 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:14,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '113541#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:14,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:14,661 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:14,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 60 [2022-11-22 02:03:14,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767208972] [2022-11-22 02:03:14,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:14,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:03:14,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:14,662 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:03:14,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=675, Invalid=4017, Unknown=0, NotChecked=0, Total=4692 [2022-11-22 02:03:14,663 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:20,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:20,797 INFO L93 Difference]: Finished difference Result 478 states and 501 transitions. [2022-11-22 02:03:20,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-22 02:03:20,797 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:03:20,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:20,797 INFO L225 Difference]: With dead ends: 478 [2022-11-22 02:03:20,797 INFO L226 Difference]: Without dead ends: 430 [2022-11-22 02:03:20,798 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 126 SyntacticMatches, 29 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8340 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=3198, Invalid=17394, Unknown=0, NotChecked=0, Total=20592 [2022-11-22 02:03:20,798 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 314 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 314 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 437 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:20,799 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [314 Valid, 226 Invalid, 437 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:20,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-11-22 02:03:21,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 80. [2022-11-22 02:03:21,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:21,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:21,412 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:21,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:21,412 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:21,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.098360655737705) internal successors, (128), 60 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:21,412 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:21,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:21,412 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:21,412 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:21,416 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (124)] Ended with exit code 0 [2022-11-22 02:03:21,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 124 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable124 [2022-11-22 02:03:21,613 INFO L420 AbstractCegarLoop]: === Iteration 126 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:21,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:21,613 INFO L85 PathProgramCache]: Analyzing trace with hash -220645013, now seen corresponding path program 84 times [2022-11-22 02:03:21,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:21,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1134104234] [2022-11-22 02:03:21,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:21,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:21,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:22,114 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 261 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:22,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:22,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1134104234] [2022-11-22 02:03:22,115 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1134104234] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:22,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012270869] [2022-11-22 02:03:22,115 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:03:22,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:22,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:22,116 INFO L229 MonitoredProcess]: Starting monitored process 125 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:22,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Waiting until timeout for monitored process [2022-11-22 02:03:22,186 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:03:22,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:22,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:22,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:23,075 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:23,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:23,546 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:23,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012270869] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:23,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [520067309] [2022-11-22 02:03:23,548 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:23,548 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:23,548 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:23,548 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:23,548 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:23,660 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:24,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115094#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:24,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:24,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:24,244 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 59 [2022-11-22 02:03:24,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979020255] [2022-11-22 02:03:24,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:24,245 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-22 02:03:24,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:24,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-22 02:03:24,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=3904, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 02:03:24,245 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:31,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:31,046 INFO L93 Difference]: Finished difference Result 533 states and 557 transitions. [2022-11-22 02:03:31,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-11-22 02:03:31,046 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:03:31,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:31,047 INFO L225 Difference]: With dead ends: 533 [2022-11-22 02:03:31,047 INFO L226 Difference]: Without dead ends: 485 [2022-11-22 02:03:31,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 127 SyntacticMatches, 29 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8500 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3295, Invalid=17875, Unknown=0, NotChecked=0, Total=21170 [2022-11-22 02:03:31,048 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 209 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 267 SdHoareTripleChecker+Invalid, 520 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:31,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 267 Invalid, 520 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:31,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-11-22 02:03:31,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 80. [2022-11-22 02:03:31,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:31,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:31,686 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:31,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:31,686 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:31,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.1166666666666667) internal successors, (127), 59 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:31,686 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:31,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:31,687 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:31,687 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:31,691 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (125)] Ended with exit code 0 [2022-11-22 02:03:31,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 125 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2022-11-22 02:03:31,887 INFO L420 AbstractCegarLoop]: === Iteration 127 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:31,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:31,888 INFO L85 PathProgramCache]: Analyzing trace with hash -482526660, now seen corresponding path program 85 times [2022-11-22 02:03:31,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:31,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881506385] [2022-11-22 02:03:31,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:31,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:31,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:32,387 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 261 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:32,387 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:32,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881506385] [2022-11-22 02:03:32,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881506385] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:32,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293823760] [2022-11-22 02:03:32,388 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:03:32,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:32,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:32,388 INFO L229 MonitoredProcess]: Starting monitored process 126 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:32,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Waiting until timeout for monitored process [2022-11-22 02:03:32,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:32,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:32,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:33,325 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:33,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:33,817 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 301 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:33,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293823760] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:33,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466869888] [2022-11-22 02:03:33,818 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:33,818 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:33,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:33,819 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:33,819 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:33,912 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:34,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '116745#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:34,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:34,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:34,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 58 [2022-11-22 02:03:34,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668299389] [2022-11-22 02:03:34,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:34,490 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:03:34,490 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:34,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:03:34,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=633, Invalid=3789, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:03:34,491 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:41,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:41,852 INFO L93 Difference]: Finished difference Result 587 states and 612 transitions. [2022-11-22 02:03:41,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-11-22 02:03:41,852 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:03:41,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:41,852 INFO L225 Difference]: With dead ends: 587 [2022-11-22 02:03:41,852 INFO L226 Difference]: Without dead ends: 539 [2022-11-22 02:03:41,853 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 128 SyntacticMatches, 29 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8434 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3295, Invalid=17875, Unknown=0, NotChecked=0, Total=21170 [2022-11-22 02:03:41,854 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 205 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 486 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 486 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:41,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [205 Valid, 294 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 486 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:03:41,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2022-11-22 02:03:42,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 80. [2022-11-22 02:03:42,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:42,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:42,480 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:42,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:42,480 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:42,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.135593220338983) internal successors, (126), 58 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:42,480 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:42,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:42,481 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:42,481 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:42,491 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (126)] Forceful destruction successful, exit code 0 [2022-11-22 02:03:42,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable126 [2022-11-22 02:03:42,686 INFO L420 AbstractCegarLoop]: === Iteration 128 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:42,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:42,687 INFO L85 PathProgramCache]: Analyzing trace with hash 1725782859, now seen corresponding path program 86 times [2022-11-22 02:03:42,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:42,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250169425] [2022-11-22 02:03:42,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:42,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:42,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:43,218 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 261 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:43,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:43,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250169425] [2022-11-22 02:03:43,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250169425] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:43,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331610317] [2022-11-22 02:03:43,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:03:43,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:43,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:43,220 INFO L229 MonitoredProcess]: Starting monitored process 127 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:43,223 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Waiting until timeout for monitored process [2022-11-22 02:03:43,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:03:43,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:43,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:43,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:44,223 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:44,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 301 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:44,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331610317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:44,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754166125] [2022-11-22 02:03:44,700 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:44,700 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:44,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:44,701 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:44,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:44,781 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:45,349 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118488#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:45,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:45,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:45,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 57 [2022-11-22 02:03:45,350 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611700269] [2022-11-22 02:03:45,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:45,350 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 02:03:45,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:45,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 02:03:45,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=618, Invalid=3672, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:03:45,352 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:54,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:03:54,154 INFO L93 Difference]: Finished difference Result 640 states and 666 transitions. [2022-11-22 02:03:54,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-11-22 02:03:54,155 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:03:54,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:03:54,156 INFO L225 Difference]: With dead ends: 640 [2022-11-22 02:03:54,156 INFO L226 Difference]: Without dead ends: 592 [2022-11-22 02:03:54,157 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 129 SyntacticMatches, 29 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8139 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3198, Invalid=17394, Unknown=0, NotChecked=0, Total=20592 [2022-11-22 02:03:54,157 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 230 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 230 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:03:54,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [230 Valid, 313 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:03:54,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-11-22 02:03:55,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 80. [2022-11-22 02:03:55,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:55,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:03:55,045 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:03:55,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:03:55,045 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:03:55,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.1551724137931036) internal successors, (125), 57 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:03:55,045 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:03:55,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:03:55,046 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:03:55,046 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:03:55,050 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (127)] Ended with exit code 0 [2022-11-22 02:03:55,246 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127,127 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:55,247 INFO L420 AbstractCegarLoop]: === Iteration 129 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:03:55,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:03:55,247 INFO L85 PathProgramCache]: Analyzing trace with hash -281191332, now seen corresponding path program 87 times [2022-11-22 02:03:55,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:03:55,247 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109424358] [2022-11-22 02:03:55,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:03:55,247 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:03:55,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:03:55,741 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 261 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:55,742 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:03:55,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109424358] [2022-11-22 02:03:55,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109424358] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:03:55,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970989317] [2022-11-22 02:03:55,742 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:03:55,742 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:03:55,742 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:03:55,747 INFO L229 MonitoredProcess]: Starting monitored process 128 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:03:55,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Waiting until timeout for monitored process [2022-11-22 02:03:55,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:03:55,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:03:55,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:03:55,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:03:56,640 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:56,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:03:57,109 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 301 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:03:57,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970989317] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:03:57,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [389489825] [2022-11-22 02:03:57,111 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:03:57,111 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:03:57,111 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:03:57,111 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:03:57,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:03:57,205 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:03:57,780 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '120317#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:03:57,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:03:57,780 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:03:57,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 56 [2022-11-22 02:03:57,780 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498283488] [2022-11-22 02:03:57,780 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:03:57,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-22 02:03:57,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:03:57,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-22 02:03:57,781 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=607, Invalid=3553, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 02:03:57,781 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:06,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:06,622 INFO L93 Difference]: Finished difference Result 692 states and 719 transitions. [2022-11-22 02:04:06,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-11-22 02:04:06,623 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:04:06,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:06,623 INFO L225 Difference]: With dead ends: 692 [2022-11-22 02:04:06,624 INFO L226 Difference]: Without dead ends: 644 [2022-11-22 02:04:06,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 130 SyntacticMatches, 29 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7624 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3010, Invalid=16450, Unknown=0, NotChecked=0, Total=19460 [2022-11-22 02:04:06,625 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 267 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:06,625 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 314 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:04:06,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2022-11-22 02:04:07,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 80. [2022-11-22 02:04:07,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:07,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:04:07,543 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:04:07,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:07,543 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:04:07,544 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.175438596491228) internal successors, (124), 56 states have internal predecessors, (124), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:07,544 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:04:07,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:04:07,544 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:07,544 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:07,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (128)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:07,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128,128 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:07,746 INFO L420 AbstractCegarLoop]: === Iteration 130 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:07,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:07,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1732277547, now seen corresponding path program 88 times [2022-11-22 02:04:07,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:07,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696202528] [2022-11-22 02:04:07,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:07,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:07,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:08,339 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 261 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:08,339 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:08,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [696202528] [2022-11-22 02:04:08,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [696202528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:08,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199800338] [2022-11-22 02:04:08,340 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:04:08,340 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:08,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:08,341 INFO L229 MonitoredProcess]: Starting monitored process 129 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:08,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Waiting until timeout for monitored process [2022-11-22 02:04:08,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:08,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:04:08,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:09,226 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:09,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:09,694 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 301 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:09,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199800338] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:09,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [554905927] [2022-11-22 02:04:09,697 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:04:09,697 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:09,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:09,697 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:09,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:09,782 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:04:10,350 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122226#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:04:10,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:04:10,350 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:10,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 55 [2022-11-22 02:04:10,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704975661] [2022-11-22 02:04:10,351 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:10,351 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-22 02:04:10,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:10,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-22 02:04:10,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=600, Invalid=3432, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:04:10,352 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 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) [2022-11-22 02:04:19,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:19,380 INFO L93 Difference]: Finished difference Result 743 states and 771 transitions. [2022-11-22 02:04:19,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-22 02:04:19,380 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 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) Word has length 64 [2022-11-22 02:04:19,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:19,381 INFO L225 Difference]: With dead ends: 743 [2022-11-22 02:04:19,381 INFO L226 Difference]: Without dead ends: 695 [2022-11-22 02:04:19,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 131 SyntacticMatches, 29 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6910 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=2743, Invalid=15079, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:04:19,383 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 310 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 476 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 476 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:19,383 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 282 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 476 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:04:19,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2022-11-22 02:04:20,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 80. [2022-11-22 02:04:20,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:20,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:04:20,051 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:04:20,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:20,051 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:04:20,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.1964285714285716) internal successors, (123), 55 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) [2022-11-22 02:04:20,051 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:04:20,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:04:20,051 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:20,051 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:20,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (129)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:20,254 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 129 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2022-11-22 02:04:20,254 INFO L420 AbstractCegarLoop]: === Iteration 131 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:20,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:20,255 INFO L85 PathProgramCache]: Analyzing trace with hash 1797228156, now seen corresponding path program 89 times [2022-11-22 02:04:20,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:20,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126258794] [2022-11-22 02:04:20,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:20,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:20,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:20,745 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 261 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:20,745 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:20,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126258794] [2022-11-22 02:04:20,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126258794] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:20,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1834480220] [2022-11-22 02:04:20,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:04:20,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:20,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:20,747 INFO L229 MonitoredProcess]: Starting monitored process 130 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:20,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Waiting until timeout for monitored process [2022-11-22 02:04:20,826 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:04:20,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:04:20,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:04:20,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:21,594 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:21,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:22,054 INFO L134 CoverageAnalysis]: Checked inductivity of 373 backedges. 301 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:22,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1834480220] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:22,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [201130622] [2022-11-22 02:04:22,055 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:04:22,055 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:22,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:22,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:22,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:22,144 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:04:22,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '124209#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:04:22,713 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:04:22,713 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:22,713 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 54 [2022-11-22 02:04:22,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381606322] [2022-11-22 02:04:22,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:22,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 02:04:22,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:22,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 02:04:22,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=3309, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 02:04:22,714 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 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) [2022-11-22 02:04:31,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:31,524 INFO L93 Difference]: Finished difference Result 793 states and 822 transitions. [2022-11-22 02:04:31,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-11-22 02:04:31,524 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 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) Word has length 64 [2022-11-22 02:04:31,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:31,525 INFO L225 Difference]: With dead ends: 793 [2022-11-22 02:04:31,525 INFO L226 Difference]: Without dead ends: 745 [2022-11-22 02:04:31,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 132 SyntacticMatches, 29 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6030 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2415, Invalid=13335, Unknown=0, NotChecked=0, Total=15750 [2022-11-22 02:04:31,526 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 568 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 568 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:31,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [568 Valid, 278 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:04:31,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2022-11-22 02:04:32,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 80. [2022-11-22 02:04:32,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:32,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:04:32,281 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:04:32,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:32,281 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:04:32,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.2181818181818183) internal successors, (122), 54 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) [2022-11-22 02:04:32,281 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:04:32,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:04:32,281 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:32,281 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:32,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (130)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:32,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,130 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:32,482 INFO L420 AbstractCegarLoop]: === Iteration 132 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:32,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:32,482 INFO L85 PathProgramCache]: Analyzing trace with hash -278886645, now seen corresponding path program 90 times [2022-11-22 02:04:32,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:32,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175046777] [2022-11-22 02:04:32,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:32,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:32,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:33,039 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 261 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:33,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:33,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175046777] [2022-11-22 02:04:33,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175046777] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:33,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048562859] [2022-11-22 02:04:33,040 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:04:33,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:33,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:33,041 INFO L229 MonitoredProcess]: Starting monitored process 131 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:33,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Waiting until timeout for monitored process [2022-11-22 02:04:33,108 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:04:33,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:04:33,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:04:33,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:33,857 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:33,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:34,320 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 301 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:34,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048562859] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:34,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641729284] [2022-11-22 02:04:34,321 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:04:34,321 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:34,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:34,321 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:34,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:34,404 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:04:34,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '126260#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:04:34,964 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:04:34,964 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:34,964 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 53 [2022-11-22 02:04:34,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198005199] [2022-11-22 02:04:34,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:34,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-22 02:04:34,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:34,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-22 02:04:34,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=598, Invalid=3184, Unknown=0, NotChecked=0, Total=3782 [2022-11-22 02:04:34,965 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 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) [2022-11-22 02:04:44,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:44,080 INFO L93 Difference]: Finished difference Result 842 states and 872 transitions. [2022-11-22 02:04:44,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-22 02:04:44,080 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 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) Word has length 64 [2022-11-22 02:04:44,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:44,081 INFO L225 Difference]: With dead ends: 842 [2022-11-22 02:04:44,081 INFO L226 Difference]: Without dead ends: 794 [2022-11-22 02:04:44,082 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 133 SyntacticMatches, 29 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5029 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2050, Invalid=11290, Unknown=0, NotChecked=0, Total=13340 [2022-11-22 02:04:44,082 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 354 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:44,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 289 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 460 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:04:44,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2022-11-22 02:04:44,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 80. [2022-11-22 02:04:44,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:44,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:04:44,998 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:04:44,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:44,998 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:04:44,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 2.240740740740741) internal successors, (121), 53 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) [2022-11-22 02:04:44,998 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:04:44,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:04:44,998 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:44,999 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:45,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (131)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:45,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,131 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:45,204 INFO L420 AbstractCegarLoop]: === Iteration 133 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:45,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:45,205 INFO L85 PathProgramCache]: Analyzing trace with hash 2009446556, now seen corresponding path program 91 times [2022-11-22 02:04:45,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:45,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686146737] [2022-11-22 02:04:45,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:45,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:45,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:45,701 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 261 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:45,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:45,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686146737] [2022-11-22 02:04:45,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686146737] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:45,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656717573] [2022-11-22 02:04:45,702 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:04:45,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:45,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:45,703 INFO L229 MonitoredProcess]: Starting monitored process 132 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:45,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Waiting until timeout for monitored process [2022-11-22 02:04:45,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:45,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:04:45,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:46,497 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:46,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:46,960 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 301 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:46,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656717573] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:46,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755222202] [2022-11-22 02:04:46,961 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:04:46,961 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:46,961 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:46,961 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:46,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:47,042 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:04:47,598 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128373#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:04:47,598 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:04:47,598 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:47,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2022-11-22 02:04:47,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991984991] [2022-11-22 02:04:47,599 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:47,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-11-22 02:04:47,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:47,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-11-22 02:04:47,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=603, Invalid=3057, Unknown=0, NotChecked=0, Total=3660 [2022-11-22 02:04:47,600 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:56,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:04:56,438 INFO L93 Difference]: Finished difference Result 890 states and 921 transitions. [2022-11-22 02:04:56,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-11-22 02:04:56,438 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:04:56,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:04:56,439 INFO L225 Difference]: With dead ends: 890 [2022-11-22 02:04:56,439 INFO L226 Difference]: Without dead ends: 842 [2022-11-22 02:04:56,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 134 SyntacticMatches, 29 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3934 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1678, Invalid=9034, Unknown=0, NotChecked=0, Total=10712 [2022-11-22 02:04:56,440 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 377 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:04:56,440 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 299 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:04:56,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-11-22 02:04:57,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 80. [2022-11-22 02:04:57,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.2151898734177216) internal successors, (96), 79 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:57,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 96 transitions. [2022-11-22 02:04:57,250 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 96 transitions. Word has length 64 [2022-11-22 02:04:57,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:04:57,250 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 96 transitions. [2022-11-22 02:04:57,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.2641509433962264) internal successors, (120), 52 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:04:57,251 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 96 transitions. [2022-11-22 02:04:57,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-22 02:04:57,251 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:04:57,251 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:04:57,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (132)] Forceful destruction successful, exit code 0 [2022-11-22 02:04:57,451 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,132 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:57,451 INFO L420 AbstractCegarLoop]: === Iteration 134 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:04:57,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:04:57,452 INFO L85 PathProgramCache]: Analyzing trace with hash 974885099, now seen corresponding path program 14 times [2022-11-22 02:04:57,452 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:04:57,452 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268321718] [2022-11-22 02:04:57,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:04:57,452 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:04:57,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:04:57,955 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 261 proven. 145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:57,956 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:04:57,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268321718] [2022-11-22 02:04:57,956 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268321718] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:04:57,956 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464441638] [2022-11-22 02:04:57,956 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:04:57,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:04:57,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:04:57,957 INFO L229 MonitoredProcess]: Starting monitored process 133 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:04:57,959 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Waiting until timeout for monitored process [2022-11-22 02:04:58,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-22 02:04:58,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:04:58,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-22 02:04:58,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:04:58,747 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:58,747 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:04:59,215 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 301 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:04:59,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464441638] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:04:59,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1478440215] [2022-11-22 02:04:59,216 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:04:59,216 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:04:59,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:04:59,216 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:04:59,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:04:59,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:04:59,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '130542#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:04:59,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:04:59,853 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:04:59,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 51 [2022-11-22 02:04:59,853 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371923160] [2022-11-22 02:04:59,853 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:04:59,853 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-11-22 02:04:59,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:04:59,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-11-22 02:04:59,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=611, Invalid=2929, Unknown=0, NotChecked=0, Total=3540 [2022-11-22 02:04:59,854 INFO L87 Difference]: Start difference. First operand 80 states and 96 transitions. Second operand has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:09,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:09,166 INFO L93 Difference]: Finished difference Result 939 states and 972 transitions. [2022-11-22 02:05:09,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-11-22 02:05:09,166 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-22 02:05:09,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:09,167 INFO L225 Difference]: With dead ends: 939 [2022-11-22 02:05:09,167 INFO L226 Difference]: Without dead ends: 891 [2022-11-22 02:05:09,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 135 SyntacticMatches, 29 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2878 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1349, Invalid=6661, Unknown=0, NotChecked=0, Total=8010 [2022-11-22 02:05:09,167 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 406 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:09,168 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [406 Valid, 238 Invalid, 404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:05:09,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 891 states. [2022-11-22 02:05:09,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 891 to 81. [2022-11-22 02:05:09,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.225) internal successors, (98), 80 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:09,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 98 transitions. [2022-11-22 02:05:09,874 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 98 transitions. Word has length 64 [2022-11-22 02:05:09,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:09,874 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 98 transitions. [2022-11-22 02:05:09,874 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.269230769230769) internal successors, (118), 51 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:09,874 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 98 transitions. [2022-11-22 02:05:09,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-11-22 02:05:09,875 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:09,875 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:09,879 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (133)] Ended with exit code 0 [2022-11-22 02:05:10,075 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable133 [2022-11-22 02:05:10,075 INFO L420 AbstractCegarLoop]: === Iteration 135 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:10,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:10,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1654437711, now seen corresponding path program 28 times [2022-11-22 02:05:10,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:10,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92291345] [2022-11-22 02:05:10,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:10,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:10,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:10,366 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:10,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:10,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92291345] [2022-11-22 02:05:10,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92291345] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:10,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741897680] [2022-11-22 02:05:10,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:05:10,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:10,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:10,367 INFO L229 MonitoredProcess]: Starting monitored process 134 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:10,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Waiting until timeout for monitored process [2022-11-22 02:05:10,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:10,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:10,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:10,520 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:10,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:10,808 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 120 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:10,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741897680] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:10,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [517594673] [2022-11-22 02:05:10,809 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:10,810 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:10,810 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:10,810 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:10,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:10,880 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:11,291 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '132742#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:11,291 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:11,291 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:11,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 19 [2022-11-22 02:05:11,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746845266] [2022-11-22 02:05:11,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:11,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-22 02:05:11,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:11,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-22 02:05:11,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=565, Unknown=0, NotChecked=0, Total=756 [2022-11-22 02:05:11,293 INFO L87 Difference]: Start difference. First operand 81 states and 98 transitions. Second operand has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 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) [2022-11-22 02:05:12,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:12,690 INFO L93 Difference]: Finished difference Result 92 states and 109 transitions. [2022-11-22 02:05:12,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-22 02:05:12,691 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 65 [2022-11-22 02:05:12,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:12,691 INFO L225 Difference]: With dead ends: 92 [2022-11-22 02:05:12,691 INFO L226 Difference]: Without dead ends: 90 [2022-11-22 02:05:12,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 169 SyntacticMatches, 30 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=534, Invalid=1446, Unknown=0, NotChecked=0, Total=1980 [2022-11-22 02:05:12,691 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 113 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:12,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 26 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:05:12,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-22 02:05:13,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-11-22 02:05:13,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.216867469879518) internal successors, (101), 83 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:13,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2022-11-22 02:05:13,625 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 65 [2022-11-22 02:05:13,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:13,626 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2022-11-22 02:05:13,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.35) internal successors, (67), 19 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) [2022-11-22 02:05:13,626 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2022-11-22 02:05:13,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:05:13,626 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:13,626 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:13,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (134)] Forceful destruction successful, exit code 0 [2022-11-22 02:05:13,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable134 [2022-11-22 02:05:13,830 INFO L420 AbstractCegarLoop]: === Iteration 136 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:13,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:13,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1685997375, now seen corresponding path program 29 times [2022-11-22 02:05:13,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:13,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092761235] [2022-11-22 02:05:13,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:13,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:13,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:14,422 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:14,422 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:14,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092761235] [2022-11-22 02:05:14,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092761235] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:14,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855703257] [2022-11-22 02:05:14,422 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:05:14,422 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:14,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:14,423 INFO L229 MonitoredProcess]: Starting monitored process 135 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:14,426 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Waiting until timeout for monitored process [2022-11-22 02:05:14,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:05:14,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:05:14,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:14,514 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:15,652 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:15,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:16,205 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:16,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855703257] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:16,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [879893280] [2022-11-22 02:05:16,206 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:16,206 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:16,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:16,207 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:16,207 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:16,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:16,915 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '133561#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:16,915 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:16,915 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:16,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 69 [2022-11-22 02:05:16,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208489957] [2022-11-22 02:05:16,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:16,915 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-22 02:05:16,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:16,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-22 02:05:16,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=964, Invalid=5042, Unknown=0, NotChecked=0, Total=6006 [2022-11-22 02:05:16,916 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:19,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:19,699 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2022-11-22 02:05:19,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-11-22 02:05:19,699 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:05:19,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:19,699 INFO L225 Difference]: With dead ends: 200 [2022-11-22 02:05:19,699 INFO L226 Difference]: Without dead ends: 149 [2022-11-22 02:05:19,700 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 129 SyntacticMatches, 31 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5660 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=1911, Invalid=10079, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 02:05:19,700 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 63 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:19,700 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 188 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:05:19,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-11-22 02:05:20,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 85. [2022-11-22 02:05:20,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:20,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:05:20,467 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:05:20,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:20,467 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:05:20,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.0) internal successors, (140), 69 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:20,467 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:05:20,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:05:20,467 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:20,468 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:20,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (135)] Ended with exit code 0 [2022-11-22 02:05:20,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 135 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable135 [2022-11-22 02:05:20,668 INFO L420 AbstractCegarLoop]: === Iteration 137 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:20,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:20,668 INFO L85 PathProgramCache]: Analyzing trace with hash -308565934, now seen corresponding path program 92 times [2022-11-22 02:05:20,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:20,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042651561] [2022-11-22 02:05:20,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:20,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:20,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:21,249 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 302 proven. 149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:21,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:21,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042651561] [2022-11-22 02:05:21,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042651561] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:21,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453973687] [2022-11-22 02:05:21,250 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:05:21,250 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:21,250 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:21,251 INFO L229 MonitoredProcess]: Starting monitored process 136 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:21,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Waiting until timeout for monitored process [2022-11-22 02:05:21,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:05:21,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:05:21,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:21,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:22,445 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:22,445 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:22,992 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:22,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453973687] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:22,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309545732] [2022-11-22 02:05:22,993 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:22,993 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:22,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:22,993 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:22,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:23,083 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:23,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134596#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:23,683 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:23,683 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:23,684 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 68 [2022-11-22 02:05:23,684 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027031679] [2022-11-22 02:05:23,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:23,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-22 02:05:23,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:23,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-22 02:05:23,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=906, Invalid=4946, Unknown=0, NotChecked=0, Total=5852 [2022-11-22 02:05:23,685 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:27,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:27,949 INFO L93 Difference]: Finished difference Result 264 states and 284 transitions. [2022-11-22 02:05:27,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 02:05:27,949 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:05:27,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:27,950 INFO L225 Difference]: With dead ends: 264 [2022-11-22 02:05:27,950 INFO L226 Difference]: Without dead ends: 213 [2022-11-22 02:05:27,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 130 SyntacticMatches, 31 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6684 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2312, Invalid=12694, Unknown=0, NotChecked=0, Total=15006 [2022-11-22 02:05:27,951 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 82 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:27,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 242 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:05:27,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2022-11-22 02:05:28,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 85. [2022-11-22 02:05:28,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:28,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:05:28,861 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:05:28,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:28,861 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:05:28,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:28,861 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:05:28,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:05:28,861 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:28,861 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:28,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (136)] Forceful destruction successful, exit code 0 [2022-11-22 02:05:29,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable136 [2022-11-22 02:05:29,067 INFO L420 AbstractCegarLoop]: === Iteration 138 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:29,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:29,067 INFO L85 PathProgramCache]: Analyzing trace with hash -1649605983, now seen corresponding path program 93 times [2022-11-22 02:05:29,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:29,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958142085] [2022-11-22 02:05:29,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:29,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:29,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:29,666 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 302 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:29,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:29,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958142085] [2022-11-22 02:05:29,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958142085] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:29,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693466354] [2022-11-22 02:05:29,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:05:29,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:29,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:29,667 INFO L229 MonitoredProcess]: Starting monitored process 137 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:29,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Waiting until timeout for monitored process [2022-11-22 02:05:29,739 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:05:29,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:05:29,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:29,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:30,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:31,405 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:31,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693466354] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:31,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [386509430] [2022-11-22 02:05:31,407 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:31,407 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:31,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:31,407 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:31,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:31,499 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:32,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '135768#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:32,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:32,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:32,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 67 [2022-11-22 02:05:32,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925981677] [2022-11-22 02:05:32,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:32,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-11-22 02:05:32,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:32,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-11-22 02:05:32,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=864, Invalid=4836, Unknown=0, NotChecked=0, Total=5700 [2022-11-22 02:05:32,118 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 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) [2022-11-22 02:05:37,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:37,679 INFO L93 Difference]: Finished difference Result 327 states and 348 transitions. [2022-11-22 02:05:37,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-22 02:05:37,680 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:05:37,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:37,680 INFO L225 Difference]: With dead ends: 327 [2022-11-22 02:05:37,680 INFO L226 Difference]: Without dead ends: 276 [2022-11-22 02:05:37,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 131 SyntacticMatches, 31 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7643 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2741, Invalid=15081, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:05:37,681 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 125 mSDsluCounter, 341 mSDsCounter, 0 mSdLazyCounter, 661 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 365 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 661 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:37,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 365 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 661 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:05:37,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2022-11-22 02:05:38,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 85. [2022-11-22 02:05:38,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:38,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:05:38,916 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:05:38,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:38,916 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:05:38,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 2.0441176470588234) internal successors, (139), 67 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) [2022-11-22 02:05:38,916 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:05:38,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:05:38,916 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:38,916 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:38,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (137)] Ended with exit code 0 [2022-11-22 02:05:39,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 137 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable137 [2022-11-22 02:05:39,117 INFO L420 AbstractCegarLoop]: === Iteration 139 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:39,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:39,117 INFO L85 PathProgramCache]: Analyzing trace with hash -168844686, now seen corresponding path program 94 times [2022-11-22 02:05:39,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:39,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1993927531] [2022-11-22 02:05:39,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:39,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:39,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 302 proven. 127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:39,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:39,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1993927531] [2022-11-22 02:05:39,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1993927531] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:39,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298035240] [2022-11-22 02:05:39,712 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:05:39,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:39,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:39,713 INFO L229 MonitoredProcess]: Starting monitored process 138 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:39,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Waiting until timeout for monitored process [2022-11-22 02:05:39,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:39,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:39,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:40,849 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:40,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:41,385 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:41,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298035240] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:41,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368928499] [2022-11-22 02:05:41,386 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:41,386 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:41,386 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:41,386 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:41,386 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:41,478 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:42,074 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '137071#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:42,074 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:42,074 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:42,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 66 [2022-11-22 02:05:42,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812279241] [2022-11-22 02:05:42,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:42,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-11-22 02:05:42,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:42,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-11-22 02:05:42,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=4724, Unknown=0, NotChecked=0, Total=5550 [2022-11-22 02:05:42,076 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:48,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:05:48,812 INFO L93 Difference]: Finished difference Result 389 states and 411 transitions. [2022-11-22 02:05:48,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-22 02:05:48,813 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:05:48,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:05:48,813 INFO L225 Difference]: With dead ends: 389 [2022-11-22 02:05:48,813 INFO L226 Difference]: Without dead ends: 338 [2022-11-22 02:05:48,814 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 132 SyntacticMatches, 31 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8499 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3137, Invalid=17169, Unknown=0, NotChecked=0, Total=20306 [2022-11-22 02:05:48,814 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 146 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 540 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:05:48,814 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 299 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 540 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:05:48,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 338 states. [2022-11-22 02:05:49,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 338 to 85. [2022-11-22 02:05:49,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:49,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:05:49,740 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:05:49,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:05:49,740 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:05:49,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 2.0597014925373136) internal successors, (138), 66 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:05:49,740 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:05:49,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:05:49,740 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:05:49,740 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:05:49,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (138)] Forceful destruction successful, exit code 0 [2022-11-22 02:05:49,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable138 [2022-11-22 02:05:49,941 INFO L420 AbstractCegarLoop]: === Iteration 140 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:05:49,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:05:49,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1541489793, now seen corresponding path program 95 times [2022-11-22 02:05:49,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:05:49,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784240783] [2022-11-22 02:05:49,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:05:49,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:05:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:05:50,511 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 302 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:50,511 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:05:50,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784240783] [2022-11-22 02:05:50,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784240783] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:05:50,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251004308] [2022-11-22 02:05:50,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:05:50,511 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:05:50,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:05:50,513 INFO L229 MonitoredProcess]: Starting monitored process 139 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:05:50,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Waiting until timeout for monitored process [2022-11-22 02:05:50,596 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:05:50,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:05:50,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:05:50,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:05:51,621 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:51,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:05:52,186 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:05:52,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251004308] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:05:52,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [513470002] [2022-11-22 02:05:52,187 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:05:52,187 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:05:52,188 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:05:52,188 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:05:52,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:05:52,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:05:52,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138499#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:05:52,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:05:52,896 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:05:52,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 65 [2022-11-22 02:05:52,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284862317] [2022-11-22 02:05:52,897 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:05:52,897 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-22 02:05:52,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:05:52,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-22 02:05:52,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=792, Invalid=4610, Unknown=0, NotChecked=0, Total=5402 [2022-11-22 02:05:52,898 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:00,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:00,877 INFO L93 Difference]: Finished difference Result 450 states and 473 transitions. [2022-11-22 02:06:00,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-22 02:06:00,877 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:06:00,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:00,877 INFO L225 Difference]: With dead ends: 450 [2022-11-22 02:06:00,877 INFO L226 Difference]: Without dead ends: 399 [2022-11-22 02:06:00,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 133 SyntacticMatches, 31 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9211 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3473, Invalid=18877, Unknown=0, NotChecked=0, Total=22350 [2022-11-22 02:06:00,879 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 202 mSDsluCounter, 260 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:00,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [202 Valid, 284 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:06:00,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2022-11-22 02:06:01,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 85. [2022-11-22 02:06:01,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:01,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:06:01,856 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:06:01,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:06:01,856 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:06:01,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.0757575757575757) internal successors, (137), 65 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:01,856 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:06:01,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:06:01,856 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:06:01,857 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:06:01,861 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (139)] Ended with exit code 0 [2022-11-22 02:06:02,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139,139 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:02,057 INFO L420 AbstractCegarLoop]: === Iteration 141 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:06:02,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:06:02,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1589926766, now seen corresponding path program 96 times [2022-11-22 02:06:02,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:06:02,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137723023] [2022-11-22 02:06:02,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:06:02,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:06:02,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:02,623 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 302 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:02,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:06:02,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137723023] [2022-11-22 02:06:02,624 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137723023] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:06:02,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447994892] [2022-11-22 02:06:02,624 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:06:02,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:02,624 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:06:02,625 INFO L229 MonitoredProcess]: Starting monitored process 140 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:06:02,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Waiting until timeout for monitored process [2022-11-22 02:06:02,695 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:06:02,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:06:02,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:06:02,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:06:03,718 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:03,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:06:04,283 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:04,283 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447994892] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:06:04,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1795809864] [2022-11-22 02:06:04,284 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:06:04,284 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:06:04,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:06:04,285 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:06:04,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:06:04,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:06:05,045 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '140046#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:06:05,045 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:06:05,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:06:05,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 64 [2022-11-22 02:06:05,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690227360] [2022-11-22 02:06:05,045 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:06:05,045 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-22 02:06:05,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:05,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-22 02:06:05,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=4494, Unknown=0, NotChecked=0, Total=5256 [2022-11-22 02:06:05,046 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:14,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:14,239 INFO L93 Difference]: Finished difference Result 510 states and 534 transitions. [2022-11-22 02:06:14,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-22 02:06:14,239 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:06:14,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:14,240 INFO L225 Difference]: With dead ends: 510 [2022-11-22 02:06:14,240 INFO L226 Difference]: Without dead ends: 459 [2022-11-22 02:06:14,241 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 134 SyntacticMatches, 31 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9734 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3728, Invalid=20142, Unknown=0, NotChecked=0, Total=23870 [2022-11-22 02:06:14,241 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 184 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:14,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 279 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:06:14,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2022-11-22 02:06:15,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 85. [2022-11-22 02:06:15,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:15,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:06:15,354 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:06:15,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:06:15,354 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:06:15,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 2.0923076923076924) internal successors, (136), 64 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:15,354 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:06:15,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:06:15,354 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:06:15,354 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:06:15,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (140)] Ended with exit code 0 [2022-11-22 02:06:15,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140,140 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:15,555 INFO L420 AbstractCegarLoop]: === Iteration 142 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:06:15,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:06:15,555 INFO L85 PathProgramCache]: Analyzing trace with hash -1275298207, now seen corresponding path program 97 times [2022-11-22 02:06:15,555 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:06:15,555 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480386290] [2022-11-22 02:06:15,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:06:15,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:06:15,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:16,147 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 302 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:16,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:06:16,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480386290] [2022-11-22 02:06:16,148 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [480386290] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:06:16,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916932949] [2022-11-22 02:06:16,148 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:06:16,148 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:16,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:06:16,149 INFO L229 MonitoredProcess]: Starting monitored process 141 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:06:16,151 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Waiting until timeout for monitored process [2022-11-22 02:06:16,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:16,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:06:16,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:06:17,244 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:17,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:06:17,788 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:17,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916932949] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:06:17,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503583489] [2022-11-22 02:06:17,789 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:06:17,790 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:06:17,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:06:17,790 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:06:17,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:06:17,887 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:06:18,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141706#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:06:18,518 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:06:18,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:06:18,518 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 63 [2022-11-22 02:06:18,518 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47669393] [2022-11-22 02:06:18,518 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:06:18,518 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-22 02:06:18,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:18,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-22 02:06:18,519 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=736, Invalid=4376, Unknown=0, NotChecked=0, Total=5112 [2022-11-22 02:06:18,520 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 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) [2022-11-22 02:06:28,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:28,251 INFO L93 Difference]: Finished difference Result 569 states and 594 transitions. [2022-11-22 02:06:28,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-11-22 02:06:28,251 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 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) Word has length 68 [2022-11-22 02:06:28,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:28,252 INFO L225 Difference]: With dead ends: 569 [2022-11-22 02:06:28,252 INFO L226 Difference]: Without dead ends: 518 [2022-11-22 02:06:28,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 135 SyntacticMatches, 31 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10035 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=3887, Invalid=20919, Unknown=0, NotChecked=0, Total=24806 [2022-11-22 02:06:28,253 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 265 mSDsluCounter, 300 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 265 SdHoareTripleChecker+Valid, 324 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:28,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [265 Valid, 324 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:06:28,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2022-11-22 02:06:29,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 85. [2022-11-22 02:06:29,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:29,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:06:29,470 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:06:29,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:06:29,470 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:06:29,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 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) [2022-11-22 02:06:29,470 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:06:29,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:06:29,470 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:06:29,471 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:06:29,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (141)] Ended with exit code 0 [2022-11-22 02:06:29,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 141 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable141 [2022-11-22 02:06:29,671 INFO L420 AbstractCegarLoop]: === Iteration 143 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:06:29,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:06:29,671 INFO L85 PathProgramCache]: Analyzing trace with hash -572412238, now seen corresponding path program 98 times [2022-11-22 02:06:29,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:06:29,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [701060667] [2022-11-22 02:06:29,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:06:29,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:06:29,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:30,287 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 302 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:30,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:06:30,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [701060667] [2022-11-22 02:06:30,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [701060667] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:06:30,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804146592] [2022-11-22 02:06:30,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:06:30,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:30,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:06:30,289 INFO L229 MonitoredProcess]: Starting monitored process 142 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:06:30,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Waiting until timeout for monitored process [2022-11-22 02:06:30,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:06:30,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:06:30,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:06:30,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:06:31,350 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:31,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:06:31,893 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:31,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804146592] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:06:31,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605565324] [2022-11-22 02:06:31,894 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:06:31,894 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:06:31,894 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:06:31,895 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:06:31,895 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:06:31,978 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:06:32,576 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '143473#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:06:32,576 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:06:32,576 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:06:32,576 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 62 [2022-11-22 02:06:32,576 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840398864] [2022-11-22 02:06:32,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:06:32,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-22 02:06:32,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:32,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-22 02:06:32,577 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=714, Invalid=4256, Unknown=0, NotChecked=0, Total=4970 [2022-11-22 02:06:32,578 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:43,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:43,216 INFO L93 Difference]: Finished difference Result 627 states and 653 transitions. [2022-11-22 02:06:43,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-22 02:06:43,216 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:06:43,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:43,217 INFO L225 Difference]: With dead ends: 627 [2022-11-22 02:06:43,217 INFO L226 Difference]: Without dead ends: 576 [2022-11-22 02:06:43,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 136 SyntacticMatches, 31 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10093 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3941, Invalid=21181, Unknown=0, NotChecked=0, Total=25122 [2022-11-22 02:06:43,219 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 270 mSDsluCounter, 313 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 270 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:43,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [270 Valid, 337 Invalid, 626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:06:43,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2022-11-22 02:06:44,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 85. [2022-11-22 02:06:44,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:44,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:06:44,356 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:06:44,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:06:44,356 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:06:44,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:44,356 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:06:44,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:06:44,357 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:06:44,357 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:06:44,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (142)] Ended with exit code 0 [2022-11-22 02:06:44,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142,142 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:44,557 INFO L420 AbstractCegarLoop]: === Iteration 144 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:06:44,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:06:44,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1667018817, now seen corresponding path program 99 times [2022-11-22 02:06:44,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:06:44,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508138696] [2022-11-22 02:06:44,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:06:44,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:06:44,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:06:45,134 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 302 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:45,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:06:45,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508138696] [2022-11-22 02:06:45,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1508138696] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:06:45,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569968374] [2022-11-22 02:06:45,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:06:45,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:06:45,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:06:45,136 INFO L229 MonitoredProcess]: Starting monitored process 143 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:06:45,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Waiting until timeout for monitored process [2022-11-22 02:06:45,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:06:45,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:06:45,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:06:45,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:06:46,147 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:46,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:06:46,671 INFO L134 CoverageAnalysis]: Checked inductivity of 409 backedges. 345 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:06:46,672 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569968374] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:06:46,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [662964226] [2022-11-22 02:06:46,673 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:06:46,673 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:06:46,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:06:46,673 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:06:46,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:06:46,754 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:06:47,345 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '145341#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:06:47,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:06:47,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:06:47,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 61 [2022-11-22 02:06:47,346 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282005664] [2022-11-22 02:06:47,346 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:06:47,346 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-22 02:06:47,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:06:47,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-22 02:06:47,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=696, Invalid=4134, Unknown=0, NotChecked=0, Total=4830 [2022-11-22 02:06:47,347 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:06:59,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:06:59,193 INFO L93 Difference]: Finished difference Result 684 states and 711 transitions. [2022-11-22 02:06:59,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2022-11-22 02:06:59,193 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:06:59,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:06:59,194 INFO L225 Difference]: With dead ends: 684 [2022-11-22 02:06:59,194 INFO L226 Difference]: Without dead ends: 633 [2022-11-22 02:06:59,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 137 SyntacticMatches, 31 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9899 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3887, Invalid=20919, Unknown=0, NotChecked=0, Total=24806 [2022-11-22 02:06:59,195 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 239 mSDsluCounter, 400 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 424 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:06:59,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 424 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:06:59,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2022-11-22 02:07:00,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 85. [2022-11-22 02:07:00,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:00,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:07:00,170 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:07:00,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:00,170 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:07:00,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 2.1451612903225805) internal successors, (133), 61 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:00,170 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:07:00,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:07:00,171 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:00,171 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:00,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (143)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:00,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,143 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:00,371 INFO L420 AbstractCegarLoop]: === Iteration 145 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:00,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:00,371 INFO L85 PathProgramCache]: Analyzing trace with hash -893140782, now seen corresponding path program 100 times [2022-11-22 02:07:00,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:00,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384897771] [2022-11-22 02:07:00,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:00,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:01,058 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 302 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:01,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:01,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384897771] [2022-11-22 02:07:01,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384897771] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:01,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770183785] [2022-11-22 02:07:01,058 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:07:01,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:01,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:01,059 INFO L229 MonitoredProcess]: Starting monitored process 144 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:01,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Waiting until timeout for monitored process [2022-11-22 02:07:01,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:01,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:07:01,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:02,092 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:02,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:02,635 INFO L134 CoverageAnalysis]: Checked inductivity of 411 backedges. 345 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:02,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770183785] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:02,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1445514612] [2022-11-22 02:07:02,636 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:07:02,636 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:02,636 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:02,636 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:02,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:02,726 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:03,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '147304#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:03,359 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:03,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:03,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 60 [2022-11-22 02:07:03,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84862748] [2022-11-22 02:07:03,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:03,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-22 02:07:03,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:03,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-22 02:07:03,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=682, Invalid=4010, Unknown=0, NotChecked=0, Total=4692 [2022-11-22 02:07:03,360 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 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) [2022-11-22 02:07:15,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:15,334 INFO L93 Difference]: Finished difference Result 740 states and 768 transitions. [2022-11-22 02:07:15,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-11-22 02:07:15,334 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 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) Word has length 68 [2022-11-22 02:07:15,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:15,335 INFO L225 Difference]: With dead ends: 740 [2022-11-22 02:07:15,335 INFO L226 Difference]: Without dead ends: 689 [2022-11-22 02:07:15,336 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 138 SyntacticMatches, 31 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9456 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=3728, Invalid=20142, Unknown=0, NotChecked=0, Total=23870 [2022-11-22 02:07:15,336 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 332 mSDsluCounter, 308 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 595 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:15,337 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [332 Valid, 332 Invalid, 595 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 560 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:07:15,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 689 states. [2022-11-22 02:07:16,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 689 to 85. [2022-11-22 02:07:16,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:16,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:07:16,924 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:07:16,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:16,924 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:07:16,925 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 2.1639344262295084) internal successors, (132), 60 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) [2022-11-22 02:07:16,925 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:07:16,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:07:16,925 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:16,925 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:16,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (144)] Ended with exit code 0 [2022-11-22 02:07:17,125 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2022-11-22 02:07:17,126 INFO L420 AbstractCegarLoop]: === Iteration 146 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:17,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:17,126 INFO L85 PathProgramCache]: Analyzing trace with hash -421537247, now seen corresponding path program 101 times [2022-11-22 02:07:17,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:17,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025678411] [2022-11-22 02:07:17,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:17,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:17,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:17,693 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 302 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:17,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:17,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025678411] [2022-11-22 02:07:17,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025678411] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:17,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [600838210] [2022-11-22 02:07:17,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:07:17,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:17,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:17,695 INFO L229 MonitoredProcess]: Starting monitored process 145 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:17,697 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Waiting until timeout for monitored process [2022-11-22 02:07:17,781 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:07:17,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:17,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:07:17,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:18,722 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:18,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:19,243 INFO L134 CoverageAnalysis]: Checked inductivity of 415 backedges. 345 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:19,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [600838210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:19,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [184070706] [2022-11-22 02:07:19,245 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:07:19,245 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:19,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:19,245 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:19,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:19,333 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:19,933 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '149356#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:19,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:19,934 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:19,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 59 [2022-11-22 02:07:19,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717981687] [2022-11-22 02:07:19,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:19,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-22 02:07:19,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:19,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-22 02:07:19,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=3884, Unknown=0, NotChecked=0, Total=4556 [2022-11-22 02:07:19,935 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 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) [2022-11-22 02:07:31,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:31,422 INFO L93 Difference]: Finished difference Result 795 states and 824 transitions. [2022-11-22 02:07:31,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-11-22 02:07:31,422 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 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) Word has length 68 [2022-11-22 02:07:31,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:31,423 INFO L225 Difference]: With dead ends: 795 [2022-11-22 02:07:31,423 INFO L226 Difference]: Without dead ends: 744 [2022-11-22 02:07:31,424 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 139 SyntacticMatches, 31 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8779 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=3473, Invalid=18877, Unknown=0, NotChecked=0, Total=22350 [2022-11-22 02:07:31,424 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 372 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 510 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 372 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 571 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:31,424 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [372 Valid, 294 Invalid, 571 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 510 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:07:31,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2022-11-22 02:07:32,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 85. [2022-11-22 02:07:32,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:32,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:07:32,373 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:07:32,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:32,373 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:07:32,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.183333333333333) internal successors, (131), 59 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) [2022-11-22 02:07:32,374 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:07:32,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:07:32,374 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:32,374 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:32,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (145)] Forceful destruction successful, exit code 0 [2022-11-22 02:07:32,574 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable145 [2022-11-22 02:07:32,574 INFO L420 AbstractCegarLoop]: === Iteration 147 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:32,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:32,575 INFO L85 PathProgramCache]: Analyzing trace with hash -683418894, now seen corresponding path program 102 times [2022-11-22 02:07:32,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:32,575 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517328085] [2022-11-22 02:07:32,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:32,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:32,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:33,134 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 302 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:33,134 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:33,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517328085] [2022-11-22 02:07:33,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517328085] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:33,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409227272] [2022-11-22 02:07:33,135 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:07:33,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:33,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:33,136 INFO L229 MonitoredProcess]: Starting monitored process 146 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:33,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Waiting until timeout for monitored process [2022-11-22 02:07:33,207 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:07:33,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:07:33,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:07:33,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:34,103 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:34,103 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:34,627 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 345 proven. 76 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:34,627 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409227272] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:34,627 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933424594] [2022-11-22 02:07:34,628 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:07:34,628 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:34,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:34,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:34,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:34,720 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:35,320 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '151491#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:35,321 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:35,321 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:35,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 58 [2022-11-22 02:07:35,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273441287] [2022-11-22 02:07:35,321 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:35,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-11-22 02:07:35,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:35,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-11-22 02:07:35,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=3756, Unknown=0, NotChecked=0, Total=4422 [2022-11-22 02:07:35,322 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 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) [2022-11-22 02:07:50,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:07:50,238 INFO L93 Difference]: Finished difference Result 849 states and 879 transitions. [2022-11-22 02:07:50,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-11-22 02:07:50,238 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 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 68 [2022-11-22 02:07:50,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:07:50,239 INFO L225 Difference]: With dead ends: 849 [2022-11-22 02:07:50,239 INFO L226 Difference]: Without dead ends: 798 [2022-11-22 02:07:50,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 140 SyntacticMatches, 31 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7895 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=3137, Invalid=17169, Unknown=0, NotChecked=0, Total=20306 [2022-11-22 02:07:50,240 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 379 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 564 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:07:50,241 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [379 Valid, 333 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 564 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:07:50,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2022-11-22 02:07:51,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 85. [2022-11-22 02:07:51,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:07:51,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:07:51,190 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:07:51,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:07:51,190 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:07:51,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 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) [2022-11-22 02:07:51,190 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:07:51,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:07:51,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:07:51,191 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:07:51,195 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (146)] Ended with exit code 0 [2022-11-22 02:07:51,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 146 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable146 [2022-11-22 02:07:51,391 INFO L420 AbstractCegarLoop]: === Iteration 148 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:07:51,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:07:51,391 INFO L85 PathProgramCache]: Analyzing trace with hash 1524890625, now seen corresponding path program 103 times [2022-11-22 02:07:51,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:07:51,392 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218574039] [2022-11-22 02:07:51,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:07:51,392 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:07:51,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:51,999 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 302 proven. 127 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:51,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:07:51,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218574039] [2022-11-22 02:07:51,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218574039] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:07:51,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512309990] [2022-11-22 02:07:52,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:07:52,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:07:52,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:07:52,001 INFO L229 MonitoredProcess]: Starting monitored process 147 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:07:52,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Waiting until timeout for monitored process [2022-11-22 02:07:52,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:07:52,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:07:52,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:07:52,923 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:52,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:07:53,445 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 345 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:07:53,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512309990] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:07:53,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1363803061] [2022-11-22 02:07:53,446 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:07:53,446 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:07:53,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:07:53,446 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:07:53,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:07:53,530 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:07:54,117 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '153703#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:07:54,117 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:07:54,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:07:54,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 57 [2022-11-22 02:07:54,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894420390] [2022-11-22 02:07:54,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:07:54,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-22 02:07:54,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:07:54,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-22 02:07:54,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=3626, Unknown=0, NotChecked=0, Total=4290 [2022-11-22 02:07:54,118 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:08,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:08,196 INFO L93 Difference]: Finished difference Result 902 states and 933 transitions. [2022-11-22 02:08:08,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-11-22 02:08:08,196 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:08:08,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:08,197 INFO L225 Difference]: With dead ends: 902 [2022-11-22 02:08:08,197 INFO L226 Difference]: Without dead ends: 851 [2022-11-22 02:08:08,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 141 SyntacticMatches, 31 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6843 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2741, Invalid=15081, Unknown=0, NotChecked=0, Total=17822 [2022-11-22 02:08:08,198 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 439 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 439 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:08,198 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [439 Valid, 313 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:08:08,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 851 states. [2022-11-22 02:08:09,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 851 to 85. [2022-11-22 02:08:09,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:09,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:08:09,707 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:08:09,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:09,707 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:08:09,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 2.2241379310344827) internal successors, (129), 57 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:09,708 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:08:09,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:08:09,708 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:09,708 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:09,712 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (147)] Ended with exit code 0 [2022-11-22 02:08:09,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 147 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable147 [2022-11-22 02:08:09,908 INFO L420 AbstractCegarLoop]: === Iteration 149 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:09,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:09,909 INFO L85 PathProgramCache]: Analyzing trace with hash -482083566, now seen corresponding path program 104 times [2022-11-22 02:08:09,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:09,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512833549] [2022-11-22 02:08:09,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:09,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:09,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:10,581 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 302 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:10,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:10,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512833549] [2022-11-22 02:08:10,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512833549] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:10,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [650228845] [2022-11-22 02:08:10,582 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-22 02:08:10,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:10,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:10,583 INFO L229 MonitoredProcess]: Starting monitored process 148 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:10,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Waiting until timeout for monitored process [2022-11-22 02:08:10,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-22 02:08:10,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:08:10,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:08:10,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:11,503 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:11,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:12,035 INFO L134 CoverageAnalysis]: Checked inductivity of 439 backedges. 345 proven. 94 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:12,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [650228845] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:12,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615023735] [2022-11-22 02:08:12,036 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:08:12,036 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:12,036 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:12,037 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:12,037 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:12,123 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:12,705 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '155986#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:12,706 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:12,706 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:12,706 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 56 [2022-11-22 02:08:12,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308082866] [2022-11-22 02:08:12,706 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:12,706 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-22 02:08:12,706 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:12,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-22 02:08:12,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=666, Invalid=3494, Unknown=0, NotChecked=0, Total=4160 [2022-11-22 02:08:12,707 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:29,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:29,419 INFO L93 Difference]: Finished difference Result 954 states and 986 transitions. [2022-11-22 02:08:29,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-11-22 02:08:29,419 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:08:29,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:29,421 INFO L225 Difference]: With dead ends: 954 [2022-11-22 02:08:29,421 INFO L226 Difference]: Without dead ends: 903 [2022-11-22 02:08:29,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 142 SyntacticMatches, 31 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5674 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=2312, Invalid=12694, Unknown=0, NotChecked=0, Total=15006 [2022-11-22 02:08:29,422 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 400 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 400 SdHoareTripleChecker+Valid, 247 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:29,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [400 Valid, 247 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:08:29,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2022-11-22 02:08:30,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 85. [2022-11-22 02:08:30,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:30,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:08:30,971 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:08:30,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:30,971 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:08:30,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 2.245614035087719) internal successors, (128), 56 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:30,971 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:08:30,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:08:30,971 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:30,972 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:30,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (148)] Forceful destruction successful, exit code 0 [2022-11-22 02:08:31,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 148 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable148 [2022-11-22 02:08:31,172 INFO L420 AbstractCegarLoop]: === Iteration 150 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:31,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:31,172 INFO L85 PathProgramCache]: Analyzing trace with hash 1531385313, now seen corresponding path program 105 times [2022-11-22 02:08:31,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:31,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496784275] [2022-11-22 02:08:31,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:31,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:31,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:31,805 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 302 proven. 149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:31,805 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:31,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496784275] [2022-11-22 02:08:31,805 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496784275] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:31,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502899148] [2022-11-22 02:08:31,805 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:08:31,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:31,805 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:31,806 INFO L229 MonitoredProcess]: Starting monitored process 149 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:31,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Waiting until timeout for monitored process [2022-11-22 02:08:31,885 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:08:31,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:08:31,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:08:31,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:32,730 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:32,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:33,265 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 345 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:33,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502899148] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:33,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706696004] [2022-11-22 02:08:33,266 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:08:33,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:33,267 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:33,267 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:33,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:33,353 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:33,933 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158334#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:33,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:33,933 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:33,934 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2022-11-22 02:08:33,934 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747123117] [2022-11-22 02:08:33,934 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:33,934 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-11-22 02:08:33,934 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:33,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-11-22 02:08:33,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=3360, Unknown=0, NotChecked=0, Total=4032 [2022-11-22 02:08:33,935 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:48,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:08:48,339 INFO L93 Difference]: Finished difference Result 1005 states and 1038 transitions. [2022-11-22 02:08:48,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-22 02:08:48,340 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:08:48,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:08:48,341 INFO L225 Difference]: With dead ends: 1005 [2022-11-22 02:08:48,341 INFO L226 Difference]: Without dead ends: 954 [2022-11-22 02:08:48,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 143 SyntacticMatches, 31 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4419 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1883, Invalid=10107, Unknown=0, NotChecked=0, Total=11990 [2022-11-22 02:08:48,343 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 385 mSDsluCounter, 279 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 385 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-22 02:08:48,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [385 Valid, 303 Invalid, 502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-22 02:08:48,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 954 states. [2022-11-22 02:08:49,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 954 to 85. [2022-11-22 02:08:49,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 84 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:49,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 102 transitions. [2022-11-22 02:08:49,396 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 102 transitions. Word has length 68 [2022-11-22 02:08:49,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:08:49,396 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 102 transitions. [2022-11-22 02:08:49,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 2.267857142857143) internal successors, (127), 55 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:08:49,397 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 102 transitions. [2022-11-22 02:08:49,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-22 02:08:49,397 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:08:49,397 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:08:49,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (149)] Ended with exit code 0 [2022-11-22 02:08:49,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 149 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable149 [2022-11-22 02:08:49,597 INFO L420 AbstractCegarLoop]: === Iteration 151 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:08:49,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:08:49,598 INFO L85 PathProgramCache]: Analyzing trace with hash 1596335922, now seen corresponding path program 15 times [2022-11-22 02:08:49,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:08:49,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270079127] [2022-11-22 02:08:49,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:08:49,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:08:49,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:08:50,177 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 302 proven. 163 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:50,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:08:50,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270079127] [2022-11-22 02:08:50,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270079127] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:08:50,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382463020] [2022-11-22 02:08:50,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:08:50,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:08:50,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:08:50,179 INFO L229 MonitoredProcess]: Starting monitored process 150 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:08:50,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Waiting until timeout for monitored process [2022-11-22 02:08:50,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:08:50,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:08:50,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-22 02:08:50,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:08:51,096 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:51,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:08:51,660 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 345 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:08:51,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382463020] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:08:51,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1126781968] [2022-11-22 02:08:51,661 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:08:51,661 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:08:51,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:08:51,662 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:08:51,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:08:51,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:08:52,490 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '160741#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~n1~0#1| 0) (<= 0 |ULTIMATE.start_main_~i0~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~i1~0#1| 0) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:08:52,490 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:08:52,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:08:52,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 54 [2022-11-22 02:08:52,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120904158] [2022-11-22 02:08:52,490 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:08:52,491 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-22 02:08:52,491 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:08:52,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-22 02:08:52,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=681, Invalid=3225, Unknown=0, NotChecked=0, Total=3906 [2022-11-22 02:08:52,492 INFO L87 Difference]: Start difference. First operand 85 states and 102 transitions. Second operand has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:05,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:09:05,703 INFO L93 Difference]: Finished difference Result 1057 states and 1092 transitions. [2022-11-22 02:09:05,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-22 02:09:05,703 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2022-11-22 02:09:05,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:09:05,705 INFO L225 Difference]: With dead ends: 1057 [2022-11-22 02:09:05,705 INFO L226 Difference]: Without dead ends: 1006 [2022-11-22 02:09:05,705 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 144 SyntacticMatches, 31 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3222 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1508, Invalid=7422, Unknown=0, NotChecked=0, Total=8930 [2022-11-22 02:09:05,705 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 341 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:09:05,705 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 228 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:09:05,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1006 states. [2022-11-22 02:09:06,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1006 to 86. [2022-11-22 02:09:06,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 85 states have (on average 1.223529411764706) internal successors, (104), 85 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:06,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 104 transitions. [2022-11-22 02:09:06,736 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 104 transitions. Word has length 68 [2022-11-22 02:09:06,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:09:06,736 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 104 transitions. [2022-11-22 02:09:06,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.272727272727273) internal successors, (125), 54 states have internal predecessors, (125), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:06,736 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 104 transitions. [2022-11-22 02:09:06,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-11-22 02:09:06,736 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:09:06,736 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:09:06,741 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (150)] Ended with exit code 0 [2022-11-22 02:09:06,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150,150 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:06,937 INFO L420 AbstractCegarLoop]: === Iteration 152 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:09:06,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:09:06,937 INFO L85 PathProgramCache]: Analyzing trace with hash 2017880645, now seen corresponding path program 30 times [2022-11-22 02:09:06,937 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:09:06,937 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206783898] [2022-11-22 02:09:06,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:09:06,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:09:06,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:07,245 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:07,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:09:07,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206783898] [2022-11-22 02:09:07,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206783898] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:09:07,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210966336] [2022-11-22 02:09:07,245 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-22 02:09:07,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:07,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:09:07,246 INFO L229 MonitoredProcess]: Starting monitored process 151 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:09:07,249 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Waiting until timeout for monitored process [2022-11-22 02:09:07,319 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-22 02:09:07,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-22 02:09:07,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:09:07,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:09:07,417 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:07,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:09:07,741 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 136 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:07,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210966336] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:09:07,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1491012654] [2022-11-22 02:09:07,742 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:09:07,742 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:09:07,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:09:07,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:09:07,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:09:07,815 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:09:08,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163180#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:09:08,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:09:08,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:09:08,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 20 [2022-11-22 02:09:08,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262045333] [2022-11-22 02:09:08,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:09:08,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-22 02:09:08,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:09:08,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-22 02:09:08,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2022-11-22 02:09:08,234 INFO L87 Difference]: Start difference. First operand 86 states and 104 transitions. Second operand has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:09,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:09:09,863 INFO L93 Difference]: Finished difference Result 97 states and 115 transitions. [2022-11-22 02:09:09,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-22 02:09:09,864 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 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 [2022-11-22 02:09:09,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:09:09,864 INFO L225 Difference]: With dead ends: 97 [2022-11-22 02:09:09,864 INFO L226 Difference]: Without dead ends: 95 [2022-11-22 02:09:09,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 180 SyntacticMatches, 32 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=590, Invalid=1572, Unknown=0, NotChecked=0, Total=2162 [2022-11-22 02:09:09,865 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 156 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:09:09,865 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 23 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:09:09,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-22 02:09:10,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 89. [2022-11-22 02:09:10,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.2159090909090908) internal successors, (107), 88 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) [2022-11-22 02:09:10,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 107 transitions. [2022-11-22 02:09:10,891 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 107 transitions. Word has length 69 [2022-11-22 02:09:10,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:09:10,891 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 107 transitions. [2022-11-22 02:09:10,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 3.380952380952381) internal successors, (71), 20 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:10,892 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 107 transitions. [2022-11-22 02:09:10,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-22 02:09:10,892 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:09:10,892 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:09:10,897 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (151)] Ended with exit code 0 [2022-11-22 02:09:11,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151,151 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:11,092 INFO L420 AbstractCegarLoop]: === Iteration 153 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:09:11,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:09:11,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1970103797, now seen corresponding path program 31 times [2022-11-22 02:09:11,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:09:11,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590989722] [2022-11-22 02:09:11,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:09:11,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:09:11,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:11,767 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 346 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:11,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:09:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590989722] [2022-11-22 02:09:11,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590989722] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:09:11,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248713219] [2022-11-22 02:09:11,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:09:11,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:11,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:09:11,769 INFO L229 MonitoredProcess]: Starting monitored process 152 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:09:11,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Waiting until timeout for monitored process [2022-11-22 02:09:11,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:11,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:09:11,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-22 02:09:13,100 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:13,100 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-22 02:09:13,727 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 392 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:13,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248713219] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-22 02:09:13,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731982648] [2022-11-22 02:09:13,728 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2022-11-22 02:09:13,729 INFO L166 IcfgInterpreter]: Building call graph [2022-11-22 02:09:13,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-22 02:09:13,729 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-22 02:09:13,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-22 02:09:13,815 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-22 02:09:14,512 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164047#(and (< |ULTIMATE.start_main_~j1~0#1| (+ |ULTIMATE.start_main_~n0~0#1| |ULTIMATE.start_main_~n1~0#1|)) (<= |ULTIMATE.start_main_~n1~0#1| 1000000) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i1~0#1|) (<= |ULTIMATE.start_main_~n0~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= (ite (< 0 |ULTIMATE.start_main_~k~0#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |ULTIMATE.start_main_~j1~0#1|) (= |ULTIMATE.start_main_~i0~0#1| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-22 02:09:14,512 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-22 02:09:14,512 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-22 02:09:14,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 73 [2022-11-22 02:09:14,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386848548] [2022-11-22 02:09:14,513 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-22 02:09:14,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-22 02:09:14,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-22 02:09:14,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-22 02:09:14,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1072, Invalid=5570, Unknown=0, NotChecked=0, Total=6642 [2022-11-22 02:09:14,515 INFO L87 Difference]: Start difference. First operand 89 states and 107 transitions. Second operand has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:18,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-22 02:09:18,146 INFO L93 Difference]: Finished difference Result 212 states and 232 transitions. [2022-11-22 02:09:18,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-22 02:09:18,146 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2022-11-22 02:09:18,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-22 02:09:18,146 INFO L225 Difference]: With dead ends: 212 [2022-11-22 02:09:18,146 INFO L226 Difference]: Without dead ends: 158 [2022-11-22 02:09:18,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 137 SyntacticMatches, 33 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6337 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2129, Invalid=11211, Unknown=0, NotChecked=0, Total=13340 [2022-11-22 02:09:18,147 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 72 mSDsluCounter, 254 mSDsCounter, 0 mSdLazyCounter, 526 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 276 SdHoareTripleChecker+Invalid, 534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 526 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-22 02:09:18,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 276 Invalid, 534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 526 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-22 02:09:18,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-11-22 02:09:19,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 90. [2022-11-22 02:09:19,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 89 states have (on average 1.2134831460674158) internal successors, (108), 89 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:19,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 108 transitions. [2022-11-22 02:09:19,218 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 108 transitions. Word has length 72 [2022-11-22 02:09:19,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-22 02:09:19,218 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 108 transitions. [2022-11-22 02:09:19,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.0) internal successors, (148), 73 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-22 02:09:19,218 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 108 transitions. [2022-11-22 02:09:19,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-22 02:09:19,218 INFO L187 NwaCegarLoop]: Found error trace [2022-11-22 02:09:19,218 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-22 02:09:19,223 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (152)] Ended with exit code 0 [2022-11-22 02:09:19,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 152 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable152 [2022-11-22 02:09:19,419 INFO L420 AbstractCegarLoop]: === Iteration 154 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-22 02:09:19,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-22 02:09:19,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1477990684, now seen corresponding path program 106 times [2022-11-22 02:09:19,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-22 02:09:19,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057287396] [2022-11-22 02:09:19,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-22 02:09:19,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-22 02:09:19,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:20,074 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 346 proven. 167 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-22 02:09:20,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-22 02:09:20,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057287396] [2022-11-22 02:09:20,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057287396] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-22 02:09:20,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941233594] [2022-11-22 02:09:20,075 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-22 02:09:20,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-22 02:09:20,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 [2022-11-22 02:09:20,076 INFO L229 MonitoredProcess]: Starting monitored process 153 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-22 02:09:20,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_12f08967-2884-402d-b224-a0c78aa0f17d/bin/utaipan-g80aRyZoba/z3 -smt2 -in SMTLIB2_COMPLIANT=true (153)] Waiting until timeout for monitored process [2022-11-22 02:09:20,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-22 02:09:20,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-22 02:09:20,150 INFO L286 TraceCheckSpWp]: Computing forward predicates...