./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7 --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 cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:41:02,135 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:41:02,137 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:41:02,180 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:41:02,180 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:41:02,181 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:41:02,183 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:41:02,186 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:41:02,188 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:41:02,189 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:41:02,190 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:41:02,191 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:41:02,192 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:41:02,193 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:41:02,195 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:41:02,196 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:41:02,197 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:41:02,198 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:41:02,200 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:41:02,203 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:41:02,205 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:41:02,206 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:41:02,208 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:41:02,209 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:41:02,213 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:41:02,213 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:41:02,213 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:41:02,215 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:41:02,215 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:41:02,216 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:41:02,217 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:41:02,218 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:41:02,218 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:41:02,219 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:41:02,220 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:41:02,221 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:41:02,221 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:41:02,222 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:41:02,222 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:41:02,223 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:41:02,224 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:41:02,224 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:41:02,253 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:41:02,253 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:41:02,254 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:41:02,254 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:41:02,254 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:41:02,255 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:41:02,255 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:41:02,255 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:41:02,255 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:41:02,256 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:41:02,257 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:41:02,257 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:41:02,257 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:41:02,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:41:02,258 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:41:02,258 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:41:02,259 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:41:02,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:41:02,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:41:02,259 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:41:02,259 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:41:02,260 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:41:02,260 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:41:02,260 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:41:02,260 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:41:02,260 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:41:02,261 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:41:02,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:41:02,261 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:41:02,261 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:41:02,262 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:41:02,262 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:41:02,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:41:02,262 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:41:02,262 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:41:02,263 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:41:02,263 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cae1888d2d961d86748cda3b827a90e6d152bf2b6038710fc1a5581289f20b0c [2021-11-25 19:41:02,533 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:41:02,554 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:41:02,556 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:41:02,558 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:41:02,558 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:41:02,560 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2021-11-25 19:41:02,627 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/data/c4e10650c/c4ce8c593ba4491eb1c053273ca10e9a/FLAG79cb198ed [2021-11-25 19:41:03,143 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:41:03,144 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i [2021-11-25 19:41:03,155 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/data/c4e10650c/c4ce8c593ba4491eb1c053273ca10e9a/FLAG79cb198ed [2021-11-25 19:41:03,517 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/data/c4e10650c/c4ce8c593ba4491eb1c053273ca10e9a [2021-11-25 19:41:03,519 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:41:03,521 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:41:03,529 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:41:03,529 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:41:03,532 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:41:03,534 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,536 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@389146bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03, skipping insertion in model container [2021-11-25 19:41:03,538 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,545 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:41:03,563 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:41:03,747 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2021-11-25 19:41:03,766 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:41:03,773 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:41:03,782 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/sv-benchmarks/c/array-examples/sorting_selectionsort_2_ground.i[823,836] [2021-11-25 19:41:03,793 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:41:03,804 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:41:03,804 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03 WrapperNode [2021-11-25 19:41:03,805 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:41:03,805 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:41:03,805 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:41:03,806 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:41:03,813 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,825 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,851 INFO L137 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 114 [2021-11-25 19:41:03,851 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:41:03,852 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:41:03,852 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:41:03,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:41:03,862 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,863 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,870 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,870 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,891 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,897 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,898 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:41:03,914 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:41:03,914 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:41:03,914 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:41:03,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (1/1) ... [2021-11-25 19:41:03,923 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:41:03,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:03,942 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:41:03,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:41:03,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:41:03,985 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:41:03,985 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:41:03,985 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:41:03,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:41:03,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:41:03,986 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:41:03,986 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 19:41:03,986 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 19:41:03,986 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:41:04,055 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:41:04,056 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:41:04,353 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:41:04,415 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:41:04,415 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-25 19:41:04,417 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:41:04 BoogieIcfgContainer [2021-11-25 19:41:04,418 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:41:04,419 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:41:04,419 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:41:04,426 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:41:04,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:41:03" (1/3) ... [2021-11-25 19:41:04,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@455389a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:41:04, skipping insertion in model container [2021-11-25 19:41:04,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:41:03" (2/3) ... [2021-11-25 19:41:04,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@455389a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:41:04, skipping insertion in model container [2021-11-25 19:41:04,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:41:04" (3/3) ... [2021-11-25 19:41:04,430 INFO L111 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_2_ground.i [2021-11-25 19:41:04,435 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:41:04,435 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:41:04,484 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:41:04,492 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-25 19:41:04,492 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:41:04,509 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:41:04,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 19:41:04,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:04,515 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:04,515 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:04,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:04,521 INFO L85 PathProgramCache]: Analyzing trace with hash -355460262, now seen corresponding path program 1 times [2021-11-25 19:41:04,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:04,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281868375] [2021-11-25 19:41:04,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:04,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:04,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:04,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:41:04,757 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:04,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281868375] [2021-11-25 19:41:04,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281868375] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:41:04,759 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:41:04,760 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:41:04,761 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361215518] [2021-11-25 19:41:04,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:41:04,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:41:04,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:04,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:41:04,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:41:04,803 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:04,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:04,916 INFO L93 Difference]: Finished difference Result 52 states and 84 transitions. [2021-11-25 19:41:04,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:41:04,919 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 19:41:04,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:04,927 INFO L225 Difference]: With dead ends: 52 [2021-11-25 19:41:04,927 INFO L226 Difference]: Without dead ends: 31 [2021-11-25 19:41:04,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:41:04,937 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 10 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:04,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 28 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:41:04,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-25 19:41:04,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2021-11-25 19:41:04,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:41:04,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2021-11-25 19:41:04,991 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 9 [2021-11-25 19:41:04,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:04,992 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2021-11-25 19:41:04,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:04,992 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2021-11-25 19:41:04,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-25 19:41:04,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:04,994 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:04,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:41:04,995 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:04,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:04,998 INFO L85 PathProgramCache]: Analyzing trace with hash 1639768149, now seen corresponding path program 1 times [2021-11-25 19:41:04,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:04,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582779629] [2021-11-25 19:41:05,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:05,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:05,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:05,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:41:05,078 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:05,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582779629] [2021-11-25 19:41:05,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582779629] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:05,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870953524] [2021-11-25 19:41:05,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:05,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:05,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:05,086 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:05,106 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:41:05,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:05,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:41:05,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:05,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:41:05,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:05,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:41:05,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870953524] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:05,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [713128059] [2021-11-25 19:41:05,363 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:05,363 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:05,368 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:05,375 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:05,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:05,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:05,514 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:05,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:05,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:05,562 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:05,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:05,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:05,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:41:05,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:05,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:05,831 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:41:05,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:41:05,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:06,044 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-25 19:41:06,048 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:06,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [713128059] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:41:06,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:06,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2021-11-25 19:41:06,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583758449] [2021-11-25 19:41:06,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:41:06,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:41:06,098 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:06,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:41:06,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:41:06,100 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:06,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:06,222 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2021-11-25 19:41:06,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:41:06,222 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-25 19:41:06,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:06,225 INFO L225 Difference]: With dead ends: 51 [2021-11-25 19:41:06,225 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:41:06,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:41:06,227 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:06,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 20 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:41:06,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:41:06,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-11-25 19:41:06,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-25 19:41:06,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2021-11-25 19:41:06,242 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2021-11-25 19:41:06,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:06,242 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2021-11-25 19:41:06,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:06,243 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2021-11-25 19:41:06,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 19:41:06,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:06,244 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:06,281 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:06,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:06,453 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:06,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:06,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1850018267, now seen corresponding path program 1 times [2021-11-25 19:41:06,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:06,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520229053] [2021-11-25 19:41:06,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:06,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:06,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:06,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:06,514 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:06,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520229053] [2021-11-25 19:41:06,514 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520229053] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:06,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906953768] [2021-11-25 19:41:06,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:06,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:06,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:06,521 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:06,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:41:06,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:06,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:41:06,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:06,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:06,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:06,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:41:06,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906953768] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:06,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1680869894] [2021-11-25 19:41:06,671 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:06,671 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:06,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:06,672 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:06,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:06,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:06,710 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:06,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:06,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:06,743 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:06,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:06,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:06,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:41:06,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:06,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:06,922 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:41:06,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:41:07,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:07,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:07,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:07,448 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:07,521 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:07,890 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '413#(and (<= 0 |#NULL.base|) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1| 1) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| 0) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1| 4)))) 1 0)) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_1|))) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:07,890 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:07,890 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:07,890 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-25 19:41:07,890 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923547813] [2021-11-25 19:41:07,891 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:07,891 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:41:07,891 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:07,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:41:07,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:41:07,892 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:08,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:08,031 INFO L93 Difference]: Finished difference Result 75 states and 116 transitions. [2021-11-25 19:41:08,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:41:08,032 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-25 19:41:08,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:08,035 INFO L225 Difference]: With dead ends: 75 [2021-11-25 19:41:08,035 INFO L226 Difference]: Without dead ends: 54 [2021-11-25 19:41:08,037 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:41:08,040 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 87 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:08,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 30 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:41:08,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-25 19:41:08,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-25 19:41:08,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 43 states have (on average 1.4651162790697674) internal successors, (63), 43 states have internal predecessors, (63), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:41:08,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 81 transitions. [2021-11-25 19:41:08,073 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 81 transitions. Word has length 12 [2021-11-25 19:41:08,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:08,073 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 81 transitions. [2021-11-25 19:41:08,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:08,078 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 81 transitions. [2021-11-25 19:41:08,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-25 19:41:08,080 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:08,080 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:08,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:08,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:08,301 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:08,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:08,301 INFO L85 PathProgramCache]: Analyzing trace with hash -395867107, now seen corresponding path program 2 times [2021-11-25 19:41:08,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:08,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011129480] [2021-11-25 19:41:08,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:08,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:08,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:08,378 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:08,379 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:08,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011129480] [2021-11-25 19:41:08,379 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2011129480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:08,379 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450012119] [2021-11-25 19:41:08,380 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:41:08,380 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:08,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:08,381 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:08,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:41:08,447 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:41:08,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:08,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:41:08,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:08,484 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:08,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:08,523 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:08,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450012119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:08,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1831105454] [2021-11-25 19:41:08,527 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:08,527 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:08,528 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:08,528 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:08,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:08,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,563 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:08,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:08,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:41:08,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:41:08,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:08,675 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:41:08,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:41:08,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:08,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:08,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:09,023 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:09,072 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:09,406 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '736#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_2| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2| Int)) (and (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| 0) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_2| 1) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_2|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_2| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_2| 4)))) 1 0)) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_2|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_2|))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:09,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:09,406 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:09,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 10 [2021-11-25 19:41:09,406 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921217543] [2021-11-25 19:41:09,406 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:09,407 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-25 19:41:09,407 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:09,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-25 19:41:09,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2021-11-25 19:41:09,408 INFO L87 Difference]: Start difference. First operand 54 states and 81 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:09,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:09,579 INFO L93 Difference]: Finished difference Result 106 states and 165 transitions. [2021-11-25 19:41:09,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-25 19:41:09,579 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-25 19:41:09,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:09,580 INFO L225 Difference]: With dead ends: 106 [2021-11-25 19:41:09,580 INFO L226 Difference]: Without dead ends: 61 [2021-11-25 19:41:09,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:41:09,582 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 20 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:09,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 77 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:41:09,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-25 19:41:09,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-25 19:41:09,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.4) internal successors, (70), 50 states have internal predecessors, (70), 9 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-25 19:41:09,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 88 transitions. [2021-11-25 19:41:09,594 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 88 transitions. Word has length 15 [2021-11-25 19:41:09,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:09,595 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 88 transitions. [2021-11-25 19:41:09,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 10 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:09,595 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 88 transitions. [2021-11-25 19:41:09,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 19:41:09,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:09,596 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:09,632 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-25 19:41:09,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:09,815 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:09,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:09,815 INFO L85 PathProgramCache]: Analyzing trace with hash -646194339, now seen corresponding path program 3 times [2021-11-25 19:41:09,815 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:09,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116981020] [2021-11-25 19:41:09,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:09,816 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:09,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:09,919 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:09,920 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:09,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116981020] [2021-11-25 19:41:09,920 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116981020] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:09,920 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758903550] [2021-11-25 19:41:09,920 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:41:09,920 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:09,921 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:09,925 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:09,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:41:09,989 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:41:09,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:09,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:41:09,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:10,029 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:10,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:10,100 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:10,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758903550] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:10,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451841912] [2021-11-25 19:41:10,102 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:10,102 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:10,103 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:10,103 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:10,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:10,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,128 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:10,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:10,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:41:10,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:41:10,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,218 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:41:10,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:41:10,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:10,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:10,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:10,488 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:10,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:10,845 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1162#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_3| Int)) (and (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_3| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_3| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_3| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_3| 4)))) 1 0)) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_3|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_3| 1) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_3|) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_3| 0) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_3|))) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:10,845 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:10,845 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:10,845 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 19:41:10,846 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599775458] [2021-11-25 19:41:10,846 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:10,846 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:41:10,846 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:10,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:41:10,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:41:10,847 INFO L87 Difference]: Start difference. First operand 61 states and 88 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:11,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:11,131 INFO L93 Difference]: Finished difference Result 182 states and 283 transitions. [2021-11-25 19:41:11,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:41:11,131 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-25 19:41:11,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:11,133 INFO L225 Difference]: With dead ends: 182 [2021-11-25 19:41:11,133 INFO L226 Difference]: Without dead ends: 127 [2021-11-25 19:41:11,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2021-11-25 19:41:11,135 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 232 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:11,135 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [252 Valid, 53 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:41:11,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-25 19:41:11,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-11-25 19:41:11,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 104 states have (on average 1.4230769230769231) internal successors, (148), 104 states have internal predecessors, (148), 21 states have call successors, (21), 1 states have call predecessors, (21), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-25 19:41:11,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 190 transitions. [2021-11-25 19:41:11,181 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 190 transitions. Word has length 18 [2021-11-25 19:41:11,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:11,181 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 190 transitions. [2021-11-25 19:41:11,181 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:11,181 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 190 transitions. [2021-11-25 19:41:11,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-25 19:41:11,183 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:11,183 INFO L514 BasicCegarLoop]: trace histogram [10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:11,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:11,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:11,399 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:11,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:11,399 INFO L85 PathProgramCache]: Analyzing trace with hash -1887520675, now seen corresponding path program 4 times [2021-11-25 19:41:11,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:11,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217391967] [2021-11-25 19:41:11,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:11,400 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:11,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:11,565 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:11,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:11,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217391967] [2021-11-25 19:41:11,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217391967] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:11,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356265627] [2021-11-25 19:41:11,565 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:41:11,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:11,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:11,568 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:11,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:41:11,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:11,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:41:11,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:11,687 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:11,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:11,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356265627] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:11,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856221379] [2021-11-25 19:41:11,913 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:11,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:11,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:11,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:11,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:11,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:11,949 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:11,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:11,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:11,972 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:11,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:12,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:12,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:41:12,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:12,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:12,090 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:41:12,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:41:12,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:12,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:12,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:12,403 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:12,452 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:12,795 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1884#(and (<= 0 |#NULL.base|) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_4| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4| Int)) (and (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_4| 0) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_4|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_4|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_4| 1) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_4| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_4| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_4|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_4| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_4| 4)))) 1 0)))) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:12,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:12,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:12,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-25 19:41:12,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754575312] [2021-11-25 19:41:12,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:12,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:41:12,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:12,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:41:12,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:41:12,797 INFO L87 Difference]: Start difference. First operand 127 states and 190 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:13,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:13,400 INFO L93 Difference]: Finished difference Result 374 states and 595 transitions. [2021-11-25 19:41:13,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:41:13,401 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-11-25 19:41:13,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:13,410 INFO L225 Difference]: With dead ends: 374 [2021-11-25 19:41:13,410 INFO L226 Difference]: Without dead ends: 259 [2021-11-25 19:41:13,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=449, Invalid=673, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:41:13,419 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 590 mSDsluCounter, 118 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 634 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:13,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [634 Valid, 88 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:41:13,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2021-11-25 19:41:13,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2021-11-25 19:41:13,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 212 states have (on average 1.4339622641509433) internal successors, (304), 212 states have internal predecessors, (304), 45 states have call successors, (45), 1 states have call predecessors, (45), 1 states have return successors, (45), 45 states have call predecessors, (45), 45 states have call successors, (45) [2021-11-25 19:41:13,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 394 transitions. [2021-11-25 19:41:13,467 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 394 transitions. Word has length 24 [2021-11-25 19:41:13,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:13,467 INFO L470 AbstractCegarLoop]: Abstraction has 259 states and 394 transitions. [2021-11-25 19:41:13,467 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:13,468 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 394 transitions. [2021-11-25 19:41:13,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-25 19:41:13,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:13,469 INFO L514 BasicCegarLoop]: trace histogram [22, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:13,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:13,695 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:41:13,696 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:13,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:13,696 INFO L85 PathProgramCache]: Analyzing trace with hash -590925219, now seen corresponding path program 5 times [2021-11-25 19:41:13,696 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:13,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138581915] [2021-11-25 19:41:13,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:13,696 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:13,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:41:14,126 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:14,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138581915] [2021-11-25 19:41:14,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138581915] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:14,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1982767172] [2021-11-25 19:41:14,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:41:14,127 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:14,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:14,129 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:14,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:41:14,216 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-25 19:41:14,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:14,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:41:14,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:14,366 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:41:14,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:14,531 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:41:14,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1982767172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:14,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [595390152] [2021-11-25 19:41:14,534 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:14,534 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:14,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:14,535 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:14,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:14,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,557 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:14,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:14,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,584 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:14,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:14,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:41:14,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,683 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:41:14,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:41:14,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:14,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:14,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:14,899 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:14,939 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:15,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3278#(and (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_5|) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_5|) (= (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_5| (- 4) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_5| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_5|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_5| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_5| 4)))) 1 0) |__VERIFIER_assert_#in~cond|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_5| 1) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_5| 0))) (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:15,288 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:15,288 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:15,288 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 37 [2021-11-25 19:41:15,288 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164145992] [2021-11-25 19:41:15,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:15,289 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-25 19:41:15,289 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:15,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-25 19:41:15,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=575, Invalid=1495, Unknown=0, NotChecked=0, Total=2070 [2021-11-25 19:41:15,291 INFO L87 Difference]: Start difference. First operand 259 states and 394 transitions. Second operand has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:20,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:20,271 INFO L93 Difference]: Finished difference Result 632 states and 1030 transitions. [2021-11-25 19:41:20,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2021-11-25 19:41:20,271 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-25 19:41:20,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:20,275 INFO L225 Difference]: With dead ends: 632 [2021-11-25 19:41:20,275 INFO L226 Difference]: Without dead ends: 397 [2021-11-25 19:41:20,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 179 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10879 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=9335, Invalid=23245, Unknown=0, NotChecked=0, Total=32580 [2021-11-25 19:41:20,294 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 580 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 550 mSolverCounterSat, 641 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 628 SdHoareTripleChecker+Valid, 235 SdHoareTripleChecker+Invalid, 1191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 641 IncrementalHoareTripleChecker+Valid, 550 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:20,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [628 Valid, 235 Invalid, 1191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [641 Valid, 550 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:41:20,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-25 19:41:20,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 388. [2021-11-25 19:41:20,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 337 states have (on average 1.2967359050445104) internal successors, (437), 337 states have internal predecessors, (437), 49 states have call successors, (49), 1 states have call predecessors, (49), 1 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2021-11-25 19:41:20,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 535 transitions. [2021-11-25 19:41:20,361 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 535 transitions. Word has length 36 [2021-11-25 19:41:20,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:20,362 INFO L470 AbstractCegarLoop]: Abstraction has 388 states and 535 transitions. [2021-11-25 19:41:20,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 states have internal predecessors, (48), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:20,362 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 535 transitions. [2021-11-25 19:41:20,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-25 19:41:20,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:20,369 INFO L514 BasicCegarLoop]: trace histogram [24, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:20,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:20,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:20,593 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:20,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:20,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1336764067, now seen corresponding path program 6 times [2021-11-25 19:41:20,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:20,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17962696] [2021-11-25 19:41:20,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:20,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:20,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:21,023 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:21,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:21,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17962696] [2021-11-25 19:41:21,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17962696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:21,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [469937248] [2021-11-25 19:41:21,023 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:41:21,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:21,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:21,024 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:21,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:41:21,122 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:41:21,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:21,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-25 19:41:21,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:21,206 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:21,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:21,932 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:21,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [469937248] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:21,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136035045] [2021-11-25 19:41:21,935 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:21,935 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:21,935 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:21,935 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:21,935 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:21,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:21,955 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:21,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:21,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:21,972 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:21,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:22,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:22,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:41:22,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:22,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:22,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:22,078 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:41:22,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:41:22,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:22,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:22,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:22,341 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:22,387 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:22,656 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5746#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_6| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_6|) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_6| 0) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_6| 1) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_6| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_6| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_6|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_6| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_6| 4)))) 1 0)) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_6|))) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:22,656 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:22,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:22,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-25 19:41:22,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883584524] [2021-11-25 19:41:22,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:22,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-25 19:41:22,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:22,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-25 19:41:22,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:41:22,659 INFO L87 Difference]: Start difference. First operand 388 states and 535 transitions. Second operand has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:24,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:24,248 INFO L93 Difference]: Finished difference Result 1036 states and 1537 transitions. [2021-11-25 19:41:24,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-25 19:41:24,249 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2021-11-25 19:41:24,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:24,257 INFO L225 Difference]: With dead ends: 1036 [2021-11-25 19:41:24,257 INFO L226 Difference]: Without dead ends: 674 [2021-11-25 19:41:24,259 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 906 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1667, Invalid=2115, Unknown=0, NotChecked=0, Total=3782 [2021-11-25 19:41:24,260 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 1563 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 1009 mSolverCounterSat, 483 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1663 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 1492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 483 IncrementalHoareTripleChecker+Valid, 1009 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:24,260 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1663 Valid, 144 Invalid, 1492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [483 Valid, 1009 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:41:24,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-11-25 19:41:24,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 674. [2021-11-25 19:41:24,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 674 states, 571 states have (on average 1.3572679509632224) internal successors, (775), 571 states have internal predecessors, (775), 101 states have call successors, (101), 1 states have call predecessors, (101), 1 states have return successors, (101), 101 states have call predecessors, (101), 101 states have call successors, (101) [2021-11-25 19:41:24,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 674 states to 674 states and 977 transitions. [2021-11-25 19:41:24,344 INFO L78 Accepts]: Start accepts. Automaton has 674 states and 977 transitions. Word has length 44 [2021-11-25 19:41:24,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:24,346 INFO L470 AbstractCegarLoop]: Abstraction has 674 states and 977 transitions. [2021-11-25 19:41:24,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.169811320754717) internal successors, (62), 52 states have internal predecessors, (62), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:24,347 INFO L276 IsEmpty]: Start isEmpty. Operand 674 states and 977 transitions. [2021-11-25 19:41:24,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-25 19:41:24,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:24,350 INFO L514 BasicCegarLoop]: trace histogram [50, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:24,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:24,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:24,577 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:24,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:24,578 INFO L85 PathProgramCache]: Analyzing trace with hash 1333537885, now seen corresponding path program 7 times [2021-11-25 19:41:24,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:24,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869794714] [2021-11-25 19:41:24,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:24,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:24,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:25,756 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:25,757 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:25,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869794714] [2021-11-25 19:41:25,757 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869794714] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:25,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [67583756] [2021-11-25 19:41:25,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:41:25,757 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:25,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:25,758 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:25,759 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:41:25,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:25,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-25 19:41:25,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:26,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:26,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:28,753 INFO L134 CoverageAnalysis]: Checked inductivity of 1330 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:28,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [67583756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:28,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817532220] [2021-11-25 19:41:28,756 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:28,756 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:28,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:28,756 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:28,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:28,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:28,786 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:28,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:28,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:28,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:41:28,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:28,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:41:28,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:28,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:41:28,909 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:41:28,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:41:28,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:29,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:29,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:29,190 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:29,230 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:29,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9426#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_7| Int)) (and (= (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_7| (- 4) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_7| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_7| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_7| 4)))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_7|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_7|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_7| 1) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_7| 0) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_7|))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:29,627 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:29,627 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:29,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 104 [2021-11-25 19:41:29,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303515476] [2021-11-25 19:41:29,627 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:29,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2021-11-25 19:41:29,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:29,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2021-11-25 19:41:29,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2021-11-25 19:41:29,634 INFO L87 Difference]: Start difference. First operand 674 states and 977 transitions. Second operand has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:36,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:41:36,225 INFO L93 Difference]: Finished difference Result 1868 states and 2889 transitions. [2021-11-25 19:41:36,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-25 19:41:36,225 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-25 19:41:36,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:41:36,235 INFO L225 Difference]: With dead ends: 1868 [2021-11-25 19:41:36,235 INFO L226 Difference]: Without dead ends: 1246 [2021-11-25 19:41:36,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1842 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6009, Invalid=6873, Unknown=0, NotChecked=0, Total=12882 [2021-11-25 19:41:36,242 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 3701 mSDsluCounter, 500 mSDsCounter, 0 mSdLazyCounter, 2500 mSolverCounterSat, 1174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3905 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 3674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1174 IncrementalHoareTripleChecker+Valid, 2500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:41:36,242 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3905 Valid, 270 Invalid, 3674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1174 Valid, 2500 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:41:36,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1246 states. [2021-11-25 19:41:36,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1246 to 1246. [2021-11-25 19:41:36,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1039 states have (on average 1.3965351299326276) internal successors, (1451), 1039 states have internal predecessors, (1451), 205 states have call successors, (205), 1 states have call predecessors, (205), 1 states have return successors, (205), 205 states have call predecessors, (205), 205 states have call successors, (205) [2021-11-25 19:41:36,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 1861 transitions. [2021-11-25 19:41:36,400 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 1861 transitions. Word has length 70 [2021-11-25 19:41:36,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:41:36,401 INFO L470 AbstractCegarLoop]: Abstraction has 1246 states and 1861 transitions. [2021-11-25 19:41:36,401 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 104 states have internal predecessors, (114), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:41:36,401 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 1861 transitions. [2021-11-25 19:41:36,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 19:41:36,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:41:36,404 INFO L514 BasicCegarLoop]: trace histogram [102, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:41:36,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:41:36,624 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:36,625 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:41:36,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:41:36,625 INFO L85 PathProgramCache]: Analyzing trace with hash -1432743331, now seen corresponding path program 8 times [2021-11-25 19:41:36,625 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:41:36,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433344094] [2021-11-25 19:41:36,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:41:36,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:41:36,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:41:40,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 5253 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:41:40,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:41:40,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433344094] [2021-11-25 19:41:40,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1433344094] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:41:40,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140510400] [2021-11-25 19:41:40,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:41:40,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:41:40,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:41:40,457 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:41:40,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:41:40,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-25 19:41:40,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:41:40,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 19:41:40,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:41:41,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2021-11-25 19:41:41,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:41:41,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5308 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 5253 trivial. 0 not checked. [2021-11-25 19:41:41,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140510400] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:41:41,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [895812133] [2021-11-25 19:41:41,966 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:41:41,966 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:41:41,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:41:41,966 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:41:41,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:41:41,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:41,993 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:41:41,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:41:41,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,011 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:41:42,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:41:42,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:41:42,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,117 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:41:42,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 200 treesize of output 188 [2021-11-25 19:41:42,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:41:42,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:41:42,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:41:42,335 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:41:42,377 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:42,972 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15990#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_8| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_8|) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_8| 0) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_8| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| 4) (- 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_8| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| 4)))) 1 0)) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_8| 1) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_8|))) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:41:42,972 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:41:42,972 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:41:42,972 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 14, 14] total 129 [2021-11-25 19:41:42,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147576147] [2021-11-25 19:41:42,973 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:41:42,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2021-11-25 19:41:42,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:41:42,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-11-25 19:41:42,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6505, Invalid=12401, Unknown=0, NotChecked=0, Total=18906 [2021-11-25 19:41:42,985 INFO L87 Difference]: Start difference. First operand 1246 states and 1861 transitions. Second operand has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:36,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:45:36,840 INFO L93 Difference]: Finished difference Result 3414 states and 5660 transitions. [2021-11-25 19:45:36,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1317 states. [2021-11-25 19:45:36,840 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 122 [2021-11-25 19:45:36,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:45:36,857 INFO L225 Difference]: With dead ends: 3414 [2021-11-25 19:45:36,857 INFO L226 Difference]: Without dead ends: 2272 [2021-11-25 19:45:37,052 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1678 GetRequests, 332 SyntacticMatches, 0 SemanticMatches, 1346 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 748824 ImplicationChecksByTransitivity, 195.4s TimeCoverageRelationStatistics Valid=517477, Invalid=1298279, Unknown=0, NotChecked=0, Total=1815756 [2021-11-25 19:45:37,053 INFO L933 BasicCegarLoop]: 221 mSDtfsCounter, 3302 mSDsluCounter, 1123 mSDsCounter, 0 mSdLazyCounter, 2519 mSolverCounterSat, 5706 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3510 SdHoareTripleChecker+Valid, 988 SdHoareTripleChecker+Invalid, 8225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5706 IncrementalHoareTripleChecker+Valid, 2519 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:45:37,054 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3510 Valid, 988 Invalid, 8225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5706 Valid, 2519 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2021-11-25 19:45:37,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2272 states. [2021-11-25 19:45:37,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2272 to 2263. [2021-11-25 19:45:37,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2263 states, 2052 states have (on average 1.2046783625730995) internal successors, (2472), 2052 states have internal predecessors, (2472), 209 states have call successors, (209), 1 states have call predecessors, (209), 1 states have return successors, (209), 209 states have call predecessors, (209), 209 states have call successors, (209) [2021-11-25 19:45:37,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2263 states to 2263 states and 2890 transitions. [2021-11-25 19:45:37,276 INFO L78 Accepts]: Start accepts. Automaton has 2263 states and 2890 transitions. Word has length 122 [2021-11-25 19:45:37,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:45:37,277 INFO L470 AbstractCegarLoop]: Abstraction has 2263 states and 2890 transitions. [2021-11-25 19:45:37,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.0852713178294573) internal successors, (140), 129 states have internal predecessors, (140), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:45:37,277 INFO L276 IsEmpty]: Start isEmpty. Operand 2263 states and 2890 transitions. [2021-11-25 19:45:37,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 19:45:37,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:45:37,279 INFO L514 BasicCegarLoop]: trace histogram [104, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:45:37,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:45:37,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:45:37,495 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:45:37,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:45:37,495 INFO L85 PathProgramCache]: Analyzing trace with hash 646185309, now seen corresponding path program 9 times [2021-11-25 19:45:37,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:45:37,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570723653] [2021-11-25 19:45:37,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:45:37,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:45:37,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:45:41,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:45:41,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:45:41,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570723653] [2021-11-25 19:45:41,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570723653] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:45:41,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879325671] [2021-11-25 19:45:41,337 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:45:41,338 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:45:41,338 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:45:41,339 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:45:41,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:45:41,769 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:45:41,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:45:41,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-25 19:45:41,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:45:42,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:45:42,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:45:53,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5713 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:45:53,226 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879325671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:45:53,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [761816280] [2021-11-25 19:45:53,227 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:45:53,228 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:45:53,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:45:53,228 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:45:53,228 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:45:53,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:53,248 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:45:53,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:45:53,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:53,275 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:45:53,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:45:53,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:53,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:45:53,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:53,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:45:53,359 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:45:53,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:45:53,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:45:53,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:45:53,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:45:53,581 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:45:53,617 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:45:54,095 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30154#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_9|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_9| 0) (= (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_9| (- 4) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_9|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_9| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| 4)))) 1 0) |__VERIFIER_assert_#in~cond|) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9|) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| 1))) (<= |#NULL.base| 0) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:45:54,095 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:45:54,095 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:54,096 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2021-11-25 19:45:54,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073637843] [2021-11-25 19:45:54,096 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:45:54,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-25 19:45:54,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:54,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-25 19:45:54,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2021-11-25 19:45:54,106 INFO L87 Difference]: Start difference. First operand 2263 states and 2890 transitions. Second operand has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:51,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:51,634 INFO L93 Difference]: Finished difference Result 5586 states and 7687 transitions. [2021-11-25 19:46:51,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-25 19:46:51,635 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 136 [2021-11-25 19:46:51,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:51,655 INFO L225 Difference]: With dead ends: 5586 [2021-11-25 19:46:51,655 INFO L226 Difference]: Without dead ends: 3429 [2021-11-25 19:46:51,664 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3786 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=23667, Invalid=25395, Unknown=0, NotChecked=0, Total=49062 [2021-11-25 19:46:51,664 INFO L933 BasicCegarLoop]: 431 mSDtfsCounter, 10011 mSDsluCounter, 1013 mSDsCounter, 0 mSdLazyCounter, 5086 mSolverCounterSat, 3288 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10431 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 8374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3288 IncrementalHoareTripleChecker+Valid, 5086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:51,665 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10431 Valid, 541 Invalid, 8374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3288 Valid, 5086 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2021-11-25 19:46:51,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3429 states. [2021-11-25 19:46:51,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3429 to 3429. [2021-11-25 19:46:51,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3429 states, 3006 states have (on average 1.2807717897538258) internal successors, (3850), 3006 states have internal predecessors, (3850), 421 states have call successors, (421), 1 states have call predecessors, (421), 1 states have return successors, (421), 421 states have call predecessors, (421), 421 states have call successors, (421) [2021-11-25 19:46:52,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3429 states to 3429 states and 4692 transitions. [2021-11-25 19:46:52,001 INFO L78 Accepts]: Start accepts. Automaton has 3429 states and 4692 transitions. Word has length 136 [2021-11-25 19:46:52,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:52,003 INFO L470 AbstractCegarLoop]: Abstraction has 3429 states and 4692 transitions. [2021-11-25 19:46:52,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0422535211267605) internal successors, (222), 212 states have internal predecessors, (222), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:52,003 INFO L276 IsEmpty]: Start isEmpty. Operand 3429 states and 4692 transitions. [2021-11-25 19:46:52,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-25 19:46:52,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:52,009 INFO L514 BasicCegarLoop]: trace histogram [210, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:52,046 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:52,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:52,225 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:52,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:52,226 INFO L85 PathProgramCache]: Analyzing trace with hash -206246819, now seen corresponding path program 10 times [2021-11-25 19:46:52,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:52,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025408126] [2021-11-25 19:46:52,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:52,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:52,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:07,406 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:47:07,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:07,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025408126] [2021-11-25 19:47:07,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025408126] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:07,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353629424] [2021-11-25 19:47:07,407 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:47:07,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:07,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:07,409 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:07,409 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_031406ce-23e1-48b5-9ed6-6cf232dd7e66/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:47:07,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:07,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 2047 conjuncts, 212 conjunts are in the unsatisfiable core [2021-11-25 19:47:07,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:08,308 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:47:08,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:47:51,267 INFO L134 CoverageAnalysis]: Checked inductivity of 22408 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:47:51,267 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353629424] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:47:51,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057348689] [2021-11-25 19:47:51,269 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-25 19:47:51,269 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:47:51,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:47:51,270 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:47:51,270 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:47:51,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:51,316 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:47:51,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:47:51,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:51,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:47:51,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:51,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:47:51,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:51,378 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:47:51,399 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:47:51,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-25 19:47:51,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 19:47:51,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:51,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2021-11-25 19:47:51,636 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-25 19:47:51,671 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:47:52,411 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48996#(and (<= 0 |#NULL.base|) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (<= |#NULL.base| 0) (exists ((|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10| Int)) (and (<= |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_10| 0) (<= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| 1) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_10|) (<= 0 |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (<= 1 |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10|) (= |__VERIFIER_assert_#in~cond| (ite (<= (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_10| (- 4) (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| 4))) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_10|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_10| (* |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| 4)))) 1 0)))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-25 19:47:52,411 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:47:52,411 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:47:52,411 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 212, 212] total 424 [2021-11-25 19:47:52,411 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254639870] [2021-11-25 19:47:52,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:47:52,413 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 425 states [2021-11-25 19:47:52,413 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:52,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 425 interpolants. [2021-11-25 19:47:52,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92249, Invalid=95673, Unknown=0, NotChecked=0, Total=187922 [2021-11-25 19:47:52,447 INFO L87 Difference]: Start difference. First operand 3429 states and 4692 transitions. Second operand has 425 states, 425 states have (on average 1.0211764705882354) internal successors, (434), 424 states have internal predecessors, (434), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)