./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8 --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 e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:52:01,007 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:52:01,009 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:52:01,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:52:01,055 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:52:01,056 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:52:01,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:52:01,060 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:52:01,062 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:52:01,063 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:52:01,065 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:52:01,066 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:52:01,067 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:52:01,071 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:52:01,072 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:52:01,074 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:52:01,075 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:52:01,076 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:52:01,079 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:52:01,082 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:52:01,091 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:52:01,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:52:01,102 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:52:01,103 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:52:01,107 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:52:01,107 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:52:01,108 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:52:01,109 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:52:01,109 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:52:01,111 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:52:01,115 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:52:01,117 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:52:01,118 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:52:01,120 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:52:01,121 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:52:01,121 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:52:01,122 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:52:01,122 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:52:01,122 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:52:01,123 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:52:01,123 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:52:01,128 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:52:01,179 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:52:01,179 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:52:01,181 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:52:01,182 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:52:01,182 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:52:01,182 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:52:01,182 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:52:01,183 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:52:01,189 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:52:01,189 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:52:01,190 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:52:01,190 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:52:01,191 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:52:01,191 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:52:01,191 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:52:01,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:52:01,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:52:01,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:52:01,193 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:52:01,193 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:52:01,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:52:01,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:52:01,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:52:01,194 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:52:01,194 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:52:01,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:52:01,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:52:01,195 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:52:01,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:52:01,196 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:52:01,197 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:52:01,197 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:52:01,197 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:52:01,198 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:52:01,198 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:52:01,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:52:01,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:52:01,199 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:52:01,199 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:52:01,199 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_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e6ceef81d5d5c6ec4b435ae3bf6300a70928e11f3a8c1d376463323495e50f12 [2021-11-07 01:52:01,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:52:01,485 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:52:01,487 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:52:01,488 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:52:01,489 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:52:01,489 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-07 01:52:01,553 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/data/8af1ebc45/ee33386e039e423f8785a1f5e414c563/FLAG779a63d11 [2021-11-07 01:52:01,982 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:52:01,985 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c [2021-11-07 01:52:01,996 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/data/8af1ebc45/ee33386e039e423f8785a1f5e414c563/FLAG779a63d11 [2021-11-07 01:52:02,387 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/data/8af1ebc45/ee33386e039e423f8785a1f5e414c563 [2021-11-07 01:52:02,389 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:52:02,391 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:52:02,392 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:52:02,392 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:52:02,395 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:52:02,396 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,397 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1505858 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02, skipping insertion in model container [2021-11-07 01:52:02,397 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,404 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:52:02,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:52:02,591 WARN L228 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_b9cefa67-f633-405a-8194-c1c8db3926b9/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-07 01:52:02,594 WARN L228 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_b9cefa67-f633-405a-8194-c1c8db3926b9/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-07 01:52:02,595 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:52:02,603 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:52:02,616 WARN L228 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_b9cefa67-f633-405a-8194-c1c8db3926b9/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[557,570] [2021-11-07 01:52:02,617 WARN L228 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_b9cefa67-f633-405a-8194-c1c8db3926b9/sv-benchmarks/c/loop-invariants/linear-inequality-inv-a.c[613,626] [2021-11-07 01:52:02,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:52:02,630 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:52:02,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02 WrapperNode [2021-11-07 01:52:02,631 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:52:02,632 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:52:02,632 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:52:02,632 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:52:02,639 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,645 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,662 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:52:02,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:52:02,666 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:52:02,666 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:52:02,673 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,674 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,675 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,675 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,678 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,681 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,682 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,684 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:52:02,685 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:52:02,685 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:52:02,685 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:52:02,686 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (1/1) ... [2021-11-07 01:52:02,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:52:02,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:02,715 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:52:02,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:52:02,772 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:52:02,772 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:52:02,773 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:52:02,773 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:52:03,071 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:52:03,071 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-07 01:52:03,073 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:52:03 BoogieIcfgContainer [2021-11-07 01:52:03,074 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:52:03,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:52:03,075 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:52:03,080 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:52:03,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:52:02" (1/3) ... [2021-11-07 01:52:03,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fb520e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:52:03, skipping insertion in model container [2021-11-07 01:52:03,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:52:02" (2/3) ... [2021-11-07 01:52:03,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fb520e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:52:03, skipping insertion in model container [2021-11-07 01:52:03,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:52:03" (3/3) ... [2021-11-07 01:52:03,083 INFO L111 eAbstractionObserver]: Analyzing ICFG linear-inequality-inv-a.c [2021-11-07 01:52:03,088 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:52:03,088 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-07 01:52:03,168 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:52:03,191 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 [2021-11-07 01:52:03,192 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-07 01:52:03,204 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:03,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-07 01:52:03,208 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:03,209 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-07 01:52:03,209 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:03,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:03,214 INFO L85 PathProgramCache]: Analyzing trace with hash 63046149, now seen corresponding path program 1 times [2021-11-07 01:52:03,222 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:03,222 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612408235] [2021-11-07 01:52:03,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:03,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:03,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:03,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:03,408 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:03,409 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612408235] [2021-11-07 01:52:03,410 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612408235] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:52:03,410 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:52:03,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:52:03,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593134547] [2021-11-07 01:52:03,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:52:03,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:03,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:52:03,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:52:03,454 INFO L87 Difference]: Start difference. First operand has 11 states, 8 states have (on average 1.75) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:03,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:03,486 INFO L93 Difference]: Finished difference Result 20 states and 25 transitions. [2021-11-07 01:52:03,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:52:03,488 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-07 01:52:03,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:03,495 INFO L225 Difference]: With dead ends: 20 [2021-11-07 01:52:03,495 INFO L226 Difference]: Without dead ends: 10 [2021-11-07 01:52:03,498 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:52:03,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-07 01:52:03,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-07 01:52:03,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:03,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2021-11-07 01:52:03,525 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 5 [2021-11-07 01:52:03,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:03,526 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2021-11-07 01:52:03,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:03,527 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2021-11-07 01:52:03,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-07 01:52:03,527 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:03,528 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-07 01:52:03,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:52:03,528 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:03,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:03,534 INFO L85 PathProgramCache]: Analyzing trace with hash 1953761755, now seen corresponding path program 1 times [2021-11-07 01:52:03,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:03,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023833896] [2021-11-07 01:52:03,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:03,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:03,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:03,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:03,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:03,630 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023833896] [2021-11-07 01:52:03,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1023833896] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:03,631 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797978841] [2021-11-07 01:52:03,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:03,631 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:03,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:03,633 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:03,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:52:03,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:03,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-07 01:52:03,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:03,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:03,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:03,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:03,828 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797978841] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:03,828 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910309270] [2021-11-07 01:52:03,849 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:52:03,850 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:03,854 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:03,860 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:03,860 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:03,888 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:03,895 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:03,896 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:03,897 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:03,898 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:03,898 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:03,899 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:03,902 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:03,923 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_9|], 21=[|v_#valid_10|]} [2021-11-07 01:52:03,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:03,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:03,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:03,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:03,946 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:03,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:03,947 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:03,948 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:03,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:03,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:03,999 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:04,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:04,031 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,047 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:04,049 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,050 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:04,050 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:04,051 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,083 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,096 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,098 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:04,099 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:04,100 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:04,109 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:04,123 INFO L185 QuantifierPusher]: treesize reduction 10, result has 91.2 percent of original size 104 [2021-11-07 01:52:04,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,168 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,263 INFO L180 QuantifierPusher]: treesize reduction 10, result has 96.6 percent of original size [2021-11-07 01:52:04,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:52:04,288 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,344 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:04,363 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:04,367 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:04,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:04,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:04,709 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:04,710 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-07 01:52:04,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937238006] [2021-11-07 01:52:04,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:52:04,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:04,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:52:04,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:52:04,712 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:04,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:04,798 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-07 01:52:04,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:52:04,799 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-07 01:52:04,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:04,799 INFO L225 Difference]: With dead ends: 27 [2021-11-07 01:52:04,800 INFO L226 Difference]: Without dead ends: 21 [2021-11-07 01:52:04,801 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:52:04,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-07 01:52:04,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2021-11-07 01:52:04,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:04,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-07 01:52:04,805 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 6 [2021-11-07 01:52:04,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:04,806 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-07 01:52:04,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:04,807 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-07 01:52:04,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-07 01:52:04,811 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:04,811 INFO L513 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:04,848 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:05,035 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:05,036 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:05,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:05,036 INFO L85 PathProgramCache]: Analyzing trace with hash 643607479, now seen corresponding path program 1 times [2021-11-07 01:52:05,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:05,037 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408764772] [2021-11-07 01:52:05,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:05,037 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:05,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:05,142 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:05,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:05,143 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408764772] [2021-11-07 01:52:05,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408764772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:05,144 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358070053] [2021-11-07 01:52:05,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:05,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:05,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:05,145 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:05,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 01:52:05,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:05,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 01:52:05,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:05,330 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:05,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:05,494 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:05,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358070053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:05,495 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396272316] [2021-11-07 01:52:05,496 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:52:05,496 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:05,497 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:05,497 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:05,497 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:05,505 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,507 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:05,507 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,509 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:05,509 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:05,510 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,510 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:05,513 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:05,524 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_10|], 21=[|v_#valid_11|]} [2021-11-07 01:52:05,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:05,545 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,546 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:05,549 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,550 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:05,550 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:05,550 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:05,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:05,588 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,591 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:05,591 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,595 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:05,597 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:05,597 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,608 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:05,610 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:05,610 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:05,619 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,627 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-07 01:52:05,634 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,646 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,698 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:05,721 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:52:05,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,780 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,790 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:05,798 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:05,802 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:05,810 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:06,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:06,221 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:06,221 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-07 01:52:06,221 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588421093] [2021-11-07 01:52:06,221 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:52:06,221 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:06,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:52:06,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:52:06,223 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:06,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:06,277 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-07 01:52:06,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:52:06,277 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-07 01:52:06,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:06,278 INFO L225 Difference]: With dead ends: 25 [2021-11-07 01:52:06,278 INFO L226 Difference]: Without dead ends: 17 [2021-11-07 01:52:06,278 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2021-11-07 01:52:06,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-07 01:52:06,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-11-07 01:52:06,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:06,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-07 01:52:06,282 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2021-11-07 01:52:06,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:06,282 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-07 01:52:06,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 8 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:06,283 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-07 01:52:06,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-07 01:52:06,283 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:06,283 INFO L513 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2021-11-07 01:52:06,320 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-07 01:52:06,487 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:06,487 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:06,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:06,488 INFO L85 PathProgramCache]: Analyzing trace with hash -1544534139, now seen corresponding path program 2 times [2021-11-07 01:52:06,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:06,488 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1823265162] [2021-11-07 01:52:06,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:06,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:06,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:06,635 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:06,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:06,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1823265162] [2021-11-07 01:52:06,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1823265162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:06,636 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100307530] [2021-11-07 01:52:06,636 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:52:06,636 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:06,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:06,637 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:06,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 01:52:06,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-07 01:52:06,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:06,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-07 01:52:06,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:06,925 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:06,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:07,206 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:07,206 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100307530] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:07,206 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [382386782] [2021-11-07 01:52:07,209 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:52:07,209 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:07,209 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:07,209 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:07,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:07,219 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,220 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:07,221 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,221 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:07,222 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:07,222 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,223 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:07,224 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:07,236 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_11|], 21=[|v_#valid_12|]} [2021-11-07 01:52:07,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:07,248 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,249 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:07,249 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,250 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:07,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:07,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,254 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:07,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:07,278 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,281 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:07,281 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,282 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:07,282 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:07,283 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,287 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,289 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,290 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:07,291 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:07,291 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:07,296 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,301 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-07 01:52:07,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,317 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:07,364 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:52:07,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:07,435 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:07,438 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:07,444 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:07,773 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:07,774 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:07,774 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2021-11-07 01:52:07,774 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936329911] [2021-11-07 01:52:07,774 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-07 01:52:07,774 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:07,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-07 01:52:07,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:52:07,775 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:08,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:08,101 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2021-11-07 01:52:08,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 01:52:08,101 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-07 01:52:08,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:08,102 INFO L225 Difference]: With dead ends: 39 [2021-11-07 01:52:08,102 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 01:52:08,103 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=177, Invalid=423, Unknown=0, NotChecked=0, Total=600 [2021-11-07 01:52:08,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 01:52:08,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 20. [2021-11-07 01:52:08,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:08,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-07 01:52:08,107 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 9 [2021-11-07 01:52:08,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:08,107 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-07 01:52:08,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:08,108 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-07 01:52:08,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-07 01:52:08,108 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:08,108 INFO L513 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:08,143 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:08,309 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-07 01:52:08,309 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:08,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:08,309 INFO L85 PathProgramCache]: Analyzing trace with hash -1895401929, now seen corresponding path program 2 times [2021-11-07 01:52:08,310 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:08,310 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559995911] [2021-11-07 01:52:08,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:08,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:08,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:08,486 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:08,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:08,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559995911] [2021-11-07 01:52:08,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559995911] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:08,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097486468] [2021-11-07 01:52:08,487 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:52:08,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:08,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:08,488 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:08,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 01:52:08,571 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 01:52:08,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:08,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 01:52:08,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:08,754 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:08,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:09,227 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:09,227 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097486468] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:09,227 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2076660948] [2021-11-07 01:52:09,229 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:52:09,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:09,230 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:09,230 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:09,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:09,235 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,236 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:09,236 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,237 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:09,237 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:09,238 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,245 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:09,246 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:09,249 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_12|], 21=[|v_#valid_13|]} [2021-11-07 01:52:09,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:09,259 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,259 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:09,260 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,260 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:09,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:09,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,264 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:09,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:09,280 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,282 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:09,283 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,283 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:09,283 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:09,284 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,287 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,288 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,291 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:09,292 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:09,292 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:09,296 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:09,300 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-07 01:52:09,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,349 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-07 01:52:09,360 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:52:09,365 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,396 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,398 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,401 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,405 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:09,410 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:09,413 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:09,420 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:09,810 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:09,810 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:09,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 16 [2021-11-07 01:52:09,811 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330168823] [2021-11-07 01:52:09,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-07 01:52:09,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:09,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-07 01:52:09,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-07 01:52:09,812 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:09,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:09,978 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2021-11-07 01:52:09,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-07 01:52:09,979 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-07 01:52:09,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:09,980 INFO L225 Difference]: With dead ends: 41 [2021-11-07 01:52:09,980 INFO L226 Difference]: Without dead ends: 27 [2021-11-07 01:52:09,981 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2021-11-07 01:52:09,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-07 01:52:09,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-11-07 01:52:09,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:09,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-11-07 01:52:09,987 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 12 [2021-11-07 01:52:09,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:09,987 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-11-07 01:52:09,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:09,987 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-11-07 01:52:09,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-07 01:52:09,988 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:09,988 INFO L513 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2021-11-07 01:52:10,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:10,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:10,204 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:10,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:10,205 INFO L85 PathProgramCache]: Analyzing trace with hash 779749317, now seen corresponding path program 3 times [2021-11-07 01:52:10,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:10,205 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109910441] [2021-11-07 01:52:10,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:10,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:10,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:10,401 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:10,401 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:10,401 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109910441] [2021-11-07 01:52:10,401 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109910441] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:10,402 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215824312] [2021-11-07 01:52:10,402 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:52:10,402 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:10,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:10,403 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:10,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 01:52:10,560 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:52:10,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:10,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-07 01:52:10,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:10,900 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:10,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:11,829 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:11,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215824312] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:11,830 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887133671] [2021-11-07 01:52:11,831 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:52:11,832 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:11,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:11,832 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:11,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:11,837 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,838 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:11,838 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,839 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:11,839 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:11,841 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,842 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:11,843 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:11,845 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_13|], 21=[|v_#valid_14|]} [2021-11-07 01:52:11,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:11,854 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:11,855 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,855 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:11,855 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:11,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:11,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:11,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:11,878 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,880 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:11,880 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,881 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:11,881 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:11,881 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:11,887 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,888 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,889 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:11,889 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:11,889 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:11,894 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:11,897 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-07 01:52:11,900 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:11,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:11,924 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:11,950 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-07 01:52:11,960 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:52:11,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,009 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:12,014 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:12,017 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:12,022 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:12,429 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:12,429 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:12,429 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2021-11-07 01:52:12,429 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436544534] [2021-11-07 01:52:12,430 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-07 01:52:12,430 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:12,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-07 01:52:12,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=541, Unknown=0, NotChecked=0, Total=812 [2021-11-07 01:52:12,431 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:13,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:13,337 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2021-11-07 01:52:13,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-07 01:52:13,338 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-07 01:52:13,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:13,340 INFO L225 Difference]: With dead ends: 69 [2021-11-07 01:52:13,340 INFO L226 Difference]: Without dead ends: 63 [2021-11-07 01:52:13,341 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 20 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 554 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=771, Invalid=1581, Unknown=0, NotChecked=0, Total=2352 [2021-11-07 01:52:13,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-07 01:52:13,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 32. [2021-11-07 01:52:13,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 30 states have (on average 1.3333333333333333) internal successors, (40), 31 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:13,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2021-11-07 01:52:13,348 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 15 [2021-11-07 01:52:13,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:13,349 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2021-11-07 01:52:13,349 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:13,349 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2021-11-07 01:52:13,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 01:52:13,350 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:13,350 INFO L513 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:13,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:13,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:13,563 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:13,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:13,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1916685111, now seen corresponding path program 3 times [2021-11-07 01:52:13,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:13,564 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117487195] [2021-11-07 01:52:13,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:13,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:13,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:13,819 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:13,819 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:13,819 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117487195] [2021-11-07 01:52:13,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117487195] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:13,820 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317371055] [2021-11-07 01:52:13,820 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:52:13,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:13,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:13,821 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:13,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 01:52:14,285 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:52:14,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:14,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-07 01:52:14,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:14,764 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:14,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:16,303 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:16,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317371055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:16,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1042272923] [2021-11-07 01:52:16,306 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:52:16,306 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:16,306 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:16,306 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:16,306 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:16,312 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,312 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:16,314 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,314 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:16,315 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:16,315 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,316 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:16,317 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:16,320 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_14|], 21=[|v_#valid_15|]} [2021-11-07 01:52:16,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:16,329 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,329 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:16,330 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,330 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:16,330 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:16,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:16,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:16,350 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,352 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:16,353 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,353 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:16,353 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:16,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,357 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,358 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:16,359 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:16,359 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:16,363 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,365 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-07 01:52:16,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,386 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,406 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:16,414 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:52:16,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,451 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:16,459 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:16,461 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:16,467 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:16,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:16,907 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:16,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 32 [2021-11-07 01:52:16,908 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450375404] [2021-11-07 01:52:16,910 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-07 01:52:16,910 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:16,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-07 01:52:16,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-07 01:52:16,912 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:17,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:17,298 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-11-07 01:52:17,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 01:52:17,298 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-07 01:52:17,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:17,299 INFO L225 Difference]: With dead ends: 73 [2021-11-07 01:52:17,299 INFO L226 Difference]: Without dead ends: 47 [2021-11-07 01:52:17,300 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 27 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2021-11-07 01:52:17,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-07 01:52:17,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2021-11-07 01:52:17,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.263157894736842) internal successors, (48), 39 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:17,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-11-07 01:52:17,308 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 20 [2021-11-07 01:52:17,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:17,309 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-11-07 01:52:17,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.1875) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:17,309 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-11-07 01:52:17,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 01:52:17,310 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:17,310 INFO L513 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1] [2021-11-07 01:52:17,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:17,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-07 01:52:17,526 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:17,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:17,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1091700667, now seen corresponding path program 4 times [2021-11-07 01:52:17,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:17,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939284808] [2021-11-07 01:52:17,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:17,527 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:17,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:17,984 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:17,984 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:17,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939284808] [2021-11-07 01:52:17,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939284808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:17,984 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939345363] [2021-11-07 01:52:17,985 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:52:17,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:17,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:17,987 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:18,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 01:52:18,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:18,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-07 01:52:18,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:19,039 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:19,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:21,569 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:21,570 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939345363] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:21,570 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671927677] [2021-11-07 01:52:21,572 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:52:21,572 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:21,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:21,572 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:21,573 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:21,584 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,585 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:21,586 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,586 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:21,587 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:21,587 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,588 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:21,589 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:21,591 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_15|], 21=[|v_#valid_16|]} [2021-11-07 01:52:21,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:21,600 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,601 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:21,601 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:21,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:21,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:21,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:21,638 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,639 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:21,640 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,641 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:21,641 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:21,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,644 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,650 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,651 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:21,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:21,652 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:21,664 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:21,668 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-07 01:52:21,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,722 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-07 01:52:21,731 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:52:21,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,765 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,768 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,771 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:21,774 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:21,776 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:21,781 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:22,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:22,154 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:22,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2021-11-07 01:52:22,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428834141] [2021-11-07 01:52:22,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-07 01:52:22,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:22,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-07 01:52:22,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1099, Invalid=1657, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 01:52:22,158 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:24,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:24,706 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2021-11-07 01:52:24,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-07 01:52:24,707 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-07 01:52:24,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:24,708 INFO L225 Difference]: With dead ends: 129 [2021-11-07 01:52:24,708 INFO L226 Difference]: Without dead ends: 119 [2021-11-07 01:52:24,711 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 32 SyntacticMatches, 21 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2270 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=3255, Invalid=6057, Unknown=0, NotChecked=0, Total=9312 [2021-11-07 01:52:24,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-07 01:52:24,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 56. [2021-11-07 01:52:24,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 54 states have (on average 1.3333333333333333) internal successors, (72), 55 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:24,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 72 transitions. [2021-11-07 01:52:24,721 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 72 transitions. Word has length 27 [2021-11-07 01:52:24,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:24,722 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 72 transitions. [2021-11-07 01:52:24,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 49 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:24,722 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 72 transitions. [2021-11-07 01:52:24,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-07 01:52:24,723 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:24,723 INFO L513 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1] [2021-11-07 01:52:24,743 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:24,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-11-07 01:52:24,924 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:24,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:24,927 INFO L85 PathProgramCache]: Analyzing trace with hash 163509559, now seen corresponding path program 4 times [2021-11-07 01:52:24,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:24,927 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159066781] [2021-11-07 01:52:24,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:24,927 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:24,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:25,614 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:25,614 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:25,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159066781] [2021-11-07 01:52:25,614 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159066781] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:25,614 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873010040] [2021-11-07 01:52:25,615 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:52:25,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:25,615 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:25,616 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:25,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 01:52:25,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:25,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-07 01:52:25,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:27,077 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:27,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:32,134 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:32,134 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873010040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:32,134 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780651611] [2021-11-07 01:52:32,136 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:52:32,139 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:32,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:32,139 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:32,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:32,149 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,149 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:32,150 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,150 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:32,151 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:32,151 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,152 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:32,163 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:32,165 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_16|], 21=[|v_#valid_17|]} [2021-11-07 01:52:32,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:32,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,174 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:32,174 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,175 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:32,175 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:32,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,177 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:32,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:32,190 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,195 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:32,196 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,196 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:32,196 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:32,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,199 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,207 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,208 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:32,208 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:32,208 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:32,212 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:32,215 INFO L185 QuantifierPusher]: treesize reduction 10, result has 91.2 percent of original size 104 [2021-11-07 01:52:32,218 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,226 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,234 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,255 INFO L180 QuantifierPusher]: treesize reduction 10, result has 96.6 percent of original size [2021-11-07 01:52:32,267 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:52:32,272 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,298 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,299 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,300 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,302 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:32,308 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:32,311 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:32,317 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:32,762 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:32,762 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:32,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 64 [2021-11-07 01:52:32,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152727875] [2021-11-07 01:52:32,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-07 01:52:32,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:32,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-07 01:52:32,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 01:52:32,766 INFO L87 Difference]: Start difference. First operand 56 states and 72 transitions. Second operand has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:33,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:52:33,374 INFO L93 Difference]: Finished difference Result 137 states and 184 transitions. [2021-11-07 01:52:33,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-07 01:52:33,375 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-07 01:52:33,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:52:33,376 INFO L225 Difference]: With dead ends: 137 [2021-11-07 01:52:33,376 INFO L226 Difference]: Without dead ends: 87 [2021-11-07 01:52:33,379 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 43 SyntacticMatches, 30 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 890 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=2032, Invalid=2660, Unknown=0, NotChecked=0, Total=4692 [2021-11-07 01:52:33,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-11-07 01:52:33,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 72. [2021-11-07 01:52:33,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 70 states have (on average 1.2571428571428571) internal successors, (88), 71 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:33,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 88 transitions. [2021-11-07 01:52:33,392 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 88 transitions. Word has length 36 [2021-11-07 01:52:33,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:52:33,392 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 88 transitions. [2021-11-07 01:52:33,393 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.09375) internal successors, (70), 64 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:52:33,393 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 88 transitions. [2021-11-07 01:52:33,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-07 01:52:33,394 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:52:33,395 INFO L513 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1] [2021-11-07 01:52:33,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:52:33,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:33,611 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:52:33,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:52:33,612 INFO L85 PathProgramCache]: Analyzing trace with hash -632841915, now seen corresponding path program 5 times [2021-11-07 01:52:33,612 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:52:33,612 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611625274] [2021-11-07 01:52:33,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:52:33,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:52:33,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:52:35,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:35,031 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:52:35,031 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611625274] [2021-11-07 01:52:35,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611625274] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:52:35,031 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278631044] [2021-11-07 01:52:35,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:52:35,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:52:35,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:52:35,034 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:52:35,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 01:52:46,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-07 01:52:46,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:52:46,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-07 01:52:46,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:52:48,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:48,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:52:57,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:52:57,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278631044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:52:57,721 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479815494] [2021-11-07 01:52:57,723 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:52:57,723 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:52:57,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:52:57,724 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:52:57,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:52:57,734 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,735 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:57,735 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,736 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:52:57,737 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:52:57,737 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,738 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:52:57,739 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:52:57,741 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_17|], 21=[|v_#valid_18|]} [2021-11-07 01:52:57,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:52:57,748 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:57,749 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,749 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:52:57,749 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:57,750 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:52:57,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:52:57,783 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,784 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:57,785 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,785 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:52:57,786 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:52:57,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,789 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,789 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,790 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:52:57,791 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:52:57,791 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:52:57,795 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,798 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-07 01:52:57,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,815 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,828 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:52:57,835 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:52:57,841 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,872 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:52:57,884 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:52:57,886 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:52:57,890 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:52:58,418 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:52:58,419 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:52:58,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 97 [2021-11-07 01:52:58,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317464713] [2021-11-07 01:52:58,420 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-07 01:52:58,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:52:58,421 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-07 01:52:58,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4483, Invalid=5617, Unknown=0, NotChecked=0, Total=10100 [2021-11-07 01:52:58,424 INFO L87 Difference]: Start difference. First operand 72 states and 88 transitions. Second operand has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:06,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:53:06,637 INFO L93 Difference]: Finished difference Result 249 states and 296 transitions. [2021-11-07 01:53:06,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-07 01:53:06,638 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 51 [2021-11-07 01:53:06,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:53:06,639 INFO L225 Difference]: With dead ends: 249 [2021-11-07 01:53:06,639 INFO L226 Difference]: Without dead ends: 231 [2021-11-07 01:53:06,647 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 56 SyntacticMatches, 45 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9158 ImplicationChecksByTransitivity, 17.7s TimeCoverageRelationStatistics Valid=13407, Invalid=23649, Unknown=0, NotChecked=0, Total=37056 [2021-11-07 01:53:06,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-07 01:53:06,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 104. [2021-11-07 01:53:06,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 102 states have (on average 1.3333333333333333) internal successors, (136), 103 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:06,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 136 transitions. [2021-11-07 01:53:06,665 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 136 transitions. Word has length 51 [2021-11-07 01:53:06,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:53:06,666 INFO L470 AbstractCegarLoop]: Abstraction has 104 states and 136 transitions. [2021-11-07 01:53:06,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 97 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:06,666 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 136 transitions. [2021-11-07 01:53:06,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-07 01:53:06,668 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:53:06,668 INFO L513 BasicCegarLoop]: trace histogram [62, 1, 1, 1, 1, 1, 1] [2021-11-07 01:53:06,676 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:53:06,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:53:06,875 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:53:06,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:53:06,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1225017655, now seen corresponding path program 5 times [2021-11-07 01:53:06,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:53:06,876 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301158961] [2021-11-07 01:53:06,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:53:06,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:53:07,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:53:08,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:53:08,967 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:53:08,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301158961] [2021-11-07 01:53:08,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [301158961] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:53:08,967 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901443006] [2021-11-07 01:53:08,967 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:53:08,967 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:53:08,967 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:53:08,968 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:53:08,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 01:53:31,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-07 01:53:31,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:31,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-07 01:53:31,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:53:34,415 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:53:34,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:53:50,840 INFO L134 CoverageAnalysis]: Checked inductivity of 1953 backedges. 0 proven. 1953 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:53:50,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901443006] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:53:50,840 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92718678] [2021-11-07 01:53:50,842 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:53:50,842 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:53:50,842 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:53:50,843 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:53:50,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:53:50,851 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,852 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:53:50,852 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,852 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:53:50,852 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:53:50,853 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,853 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:53:50,854 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:53:50,855 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_18|], 21=[|v_#valid_19|]} [2021-11-07 01:53:50,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:53:50,862 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:53:50,863 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,863 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:53:50,863 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:53:50,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,866 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:53:50,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:53:50,888 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:53:50,891 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,891 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:53:50,891 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:53:50,892 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,895 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,896 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:53:50,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:53:50,897 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:53:50,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:53:50,904 INFO L185 QuantifierPusher]: treesize reduction 6, result has 94.5 percent of original size 104 [2021-11-07 01:53:50,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,939 INFO L180 QuantifierPusher]: treesize reduction 6, result has 97.9 percent of original size [2021-11-07 01:53:50,946 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 280 [2021-11-07 01:53:50,952 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,990 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:53:50,993 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:53:50,995 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:53:51,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:53:51,626 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:53:51,626 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:53:51,627 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 128 [2021-11-07 01:53:51,627 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971175961] [2021-11-07 01:53:51,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 128 states [2021-11-07 01:53:51,628 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:53:51,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2021-11-07 01:53:51,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-07 01:53:51,633 INFO L87 Difference]: Start difference. First operand 104 states and 136 transitions. Second operand has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:53,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:53:53,296 INFO L93 Difference]: Finished difference Result 265 states and 360 transitions. [2021-11-07 01:53:53,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-07 01:53:53,297 INFO L78 Accepts]: Start accepts. Automaton has has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-07 01:53:53,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:53:53,298 INFO L225 Difference]: With dead ends: 265 [2021-11-07 01:53:53,298 INFO L226 Difference]: Without dead ends: 167 [2021-11-07 01:53:53,301 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 75 SyntacticMatches, 62 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2826 ImplicationChecksByTransitivity, 19.0s TimeCoverageRelationStatistics Valid=8144, Invalid=9412, Unknown=0, NotChecked=0, Total=17556 [2021-11-07 01:53:53,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-11-07 01:53:53,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 136. [2021-11-07 01:53:53,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 134 states have (on average 1.2537313432835822) internal successors, (168), 135 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:53,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 168 transitions. [2021-11-07 01:53:53,320 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 168 transitions. Word has length 68 [2021-11-07 01:53:53,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:53:53,321 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 168 transitions. [2021-11-07 01:53:53,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 128 states, 128 states have (on average 1.046875) internal successors, (134), 128 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:53:53,321 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 168 transitions. [2021-11-07 01:53:53,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 01:53:53,324 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:53:53,324 INFO L513 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1] [2021-11-07 01:53:53,332 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:53:53,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-11-07 01:53:53,532 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:53:53,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:53:53,533 INFO L85 PathProgramCache]: Analyzing trace with hash 1245829957, now seen corresponding path program 6 times [2021-11-07 01:53:53,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:53:53,533 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841867725] [2021-11-07 01:53:53,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:53:53,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:53:54,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:53:57,873 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:53:57,874 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:53:57,874 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841867725] [2021-11-07 01:53:57,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841867725] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:53:57,874 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46086310] [2021-11-07 01:53:57,874 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:53:57,874 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:53:57,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:53:57,875 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:53:57,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 01:53:59,779 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:53:59,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:53:59,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 191 conjunts are in the unsatisfiable core [2021-11-07 01:53:59,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:54:05,458 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:54:05,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:54:37,599 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:54:37,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [46086310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:54:37,599 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325038692] [2021-11-07 01:54:37,601 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:54:37,601 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:54:37,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:54:37,601 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:54:37,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:54:37,604 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,605 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:54:37,605 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,605 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:54:37,606 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:54:37,606 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,606 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:54:37,607 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:54:37,609 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_19|], 21=[|v_#valid_20|]} [2021-11-07 01:54:37,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:54:37,616 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,616 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:54:37,617 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,617 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:54:37,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:54:37,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,619 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:54:37,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:54:37,634 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,635 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:54:37,635 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,636 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:54:37,636 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:54:37,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,640 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,644 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:54:37,644 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:54:37,645 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:54:37,647 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,649 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-07 01:54:37,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,679 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,698 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:54:37,703 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:54:37,706 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,733 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,736 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:54:37,740 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:54:37,742 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:54:37,747 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:54:38,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:54:38,391 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:54:38,391 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 193 [2021-11-07 01:54:38,391 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263258430] [2021-11-07 01:54:38,392 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-07 01:54:38,392 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:54:38,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-07 01:54:38,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18163, Invalid=20449, Unknown=0, NotChecked=0, Total=38612 [2021-11-07 01:54:38,404 INFO L87 Difference]: Start difference. First operand 136 states and 168 transitions. Second operand has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:55:10,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:55:10,181 INFO L93 Difference]: Finished difference Result 489 states and 584 transitions. [2021-11-07 01:55:10,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-11-07 01:55:10,182 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-07 01:55:10,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:55:10,184 INFO L225 Difference]: With dead ends: 489 [2021-11-07 01:55:10,184 INFO L226 Difference]: Without dead ends: 455 [2021-11-07 01:55:10,197 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 580 GetRequests, 104 SyntacticMatches, 93 SemanticMatches, 383 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36758 ImplicationChecksByTransitivity, 68.0s TimeCoverageRelationStatistics Valid=54447, Invalid=93393, Unknown=0, NotChecked=0, Total=147840 [2021-11-07 01:55:10,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-11-07 01:55:10,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 200. [2021-11-07 01:55:10,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 198 states have (on average 1.3333333333333333) internal successors, (264), 199 states have internal predecessors, (264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:55:10,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 264 transitions. [2021-11-07 01:55:10,226 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 264 transitions. Word has length 99 [2021-11-07 01:55:10,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:55:10,227 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 264 transitions. [2021-11-07 01:55:10,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 193 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:55:10,227 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 264 transitions. [2021-11-07 01:55:10,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-07 01:55:10,230 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:55:10,230 INFO L513 BasicCegarLoop]: trace histogram [126, 1, 1, 1, 1, 1, 1] [2021-11-07 01:55:10,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:55:10,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:55:10,443 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:55:10,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:55:10,444 INFO L85 PathProgramCache]: Analyzing trace with hash 1755246903, now seen corresponding path program 6 times [2021-11-07 01:55:10,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:55:10,444 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1391679526] [2021-11-07 01:55:10,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:55:10,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:55:11,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:55:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:55:17,677 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:55:17,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1391679526] [2021-11-07 01:55:17,677 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1391679526] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:55:17,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558773709] [2021-11-07 01:55:17,677 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:55:17,677 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:55:17,677 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:55:17,678 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:55:17,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 01:55:21,328 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:55:21,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:55:21,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 255 conjunts are in the unsatisfiable core [2021-11-07 01:55:21,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:55:30,985 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:55:30,986 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:56:33,641 INFO L134 CoverageAnalysis]: Checked inductivity of 8001 backedges. 0 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:56:33,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558773709] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:56:33,641 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1122496311] [2021-11-07 01:56:33,643 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-07 01:56:33,643 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:56:33,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:56:33,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:56:33,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:56:33,657 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,657 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:56:33,658 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,658 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:56:33,659 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:56:33,659 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,660 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:56:33,661 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:56:33,662 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_20|], 21=[|v_#valid_21|]} [2021-11-07 01:56:33,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:56:33,675 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:56:33,676 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,676 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:56:33,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:56:33,677 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:56:33,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:56:33,697 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,699 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:56:33,700 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,701 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:56:33,701 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:56:33,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,703 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,705 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,706 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:56:33,707 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:56:33,707 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:56:33,712 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,715 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 120 [2021-11-07 01:56:33,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,744 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,766 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:56:33,773 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:56:33,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,803 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:56:33,813 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:56:33,816 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:56:33,821 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:56:34,827 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:56:34,828 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:56:34,828 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 129, 129] total 256 [2021-11-07 01:56:34,828 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177568221] [2021-11-07 01:56:34,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 256 states [2021-11-07 01:56:34,829 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:56:34,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 256 interpolants. [2021-11-07 01:56:34,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-07 01:56:34,837 INFO L87 Difference]: Start difference. First operand 200 states and 264 transitions. Second operand has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:43,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:56:43,927 INFO L93 Difference]: Finished difference Result 521 states and 712 transitions. [2021-11-07 01:56:43,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 256 states. [2021-11-07 01:56:43,928 INFO L78 Accepts]: Start accepts. Automaton has has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2021-11-07 01:56:43,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:56:43,930 INFO L225 Difference]: With dead ends: 521 [2021-11-07 01:56:43,930 INFO L226 Difference]: Without dead ends: 327 [2021-11-07 01:56:43,936 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 524 GetRequests, 139 SyntacticMatches, 126 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9770 ImplicationChecksByTransitivity, 74.8s TimeCoverageRelationStatistics Valid=32656, Invalid=35204, Unknown=0, NotChecked=0, Total=67860 [2021-11-07 01:56:43,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2021-11-07 01:56:43,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 264. [2021-11-07 01:56:43,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 262 states have (on average 1.251908396946565) internal successors, (328), 263 states have internal predecessors, (328), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:43,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 328 transitions. [2021-11-07 01:56:43,972 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 328 transitions. Word has length 132 [2021-11-07 01:56:43,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:56:43,973 INFO L470 AbstractCegarLoop]: Abstraction has 264 states and 328 transitions. [2021-11-07 01:56:43,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 256 states, 256 states have (on average 1.0234375) internal successors, (262), 256 states have internal predecessors, (262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:56:43,974 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 328 transitions. [2021-11-07 01:56:43,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2021-11-07 01:56:43,977 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:56:43,977 INFO L513 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1] [2021-11-07 01:56:44,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 01:56:44,195 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2021-11-07 01:56:44,195 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:56:44,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:56:44,196 INFO L85 PathProgramCache]: Analyzing trace with hash 189947717, now seen corresponding path program 7 times [2021-11-07 01:56:44,196 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:56:44,196 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157661671] [2021-11-07 01:56:44,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:56:44,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:56:46,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:00,277 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:57:00,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:57:00,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157661671] [2021-11-07 01:57:00,278 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157661671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:57:00,278 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638478503] [2021-11-07 01:57:00,278 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:57:00,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:57:00,279 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:57:00,280 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:57:00,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 01:57:11,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:57:11,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 1371 conjuncts, 383 conjunts are in the unsatisfiable core [2021-11-07 01:57:11,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:57:31,591 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:57:31,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:46,833 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:59:46,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638478503] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:46,834 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413580936] [2021-11-07 01:59:46,836 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-07 01:59:46,836 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:59:46,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-07 01:59:46,836 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-07 01:59:46,836 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-07 01:59:46,845 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,846 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:59:46,846 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,847 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 49 [2021-11-07 01:59:46,847 WARN L197 QuantifierPusher]: Ignoring assumption. [2021-11-07 01:59:46,848 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,848 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 12 [2021-11-07 01:59:46,849 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 119 [2021-11-07 01:59:46,851 INFO L446 ElimStorePlain]: Different costs {0=[|v_#length_21|], 21=[|v_#valid_22|]} [2021-11-07 01:59:46,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 9 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 16 [2021-11-07 01:59:46,860 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,861 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:59:46,861 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,862 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 16 [2021-11-07 01:59:46,862 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-11-07 01:59:46,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-07 01:59:46,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 30 [2021-11-07 01:59:46,882 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,884 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:59:46,885 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,885 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 21 [2021-11-07 01:59:46,886 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-11-07 01:59:46,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,888 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,889 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,890 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 91 [2021-11-07 01:59:46,891 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-11-07 01:59:46,891 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:116, output treesize:91 [2021-11-07 01:59:46,901 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,904 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 116 [2021-11-07 01:59:46,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,914 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,921 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,933 INFO L180 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-11-07 01:59:46,940 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 290 [2021-11-07 01:59:46,945 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,964 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,967 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout 10000 ms and remaining time -1 ms [2021-11-07 01:59:46,974 INFO L180 QuantifierPusher]: treesize reduction 30, result has 64.3 percent of original size [2021-11-07 01:59:46,976 INFO L185 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 40 [2021-11-07 01:59:46,981 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-07 01:59:48,092 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-11-07 01:59:48,092 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:59:48,093 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 385 [2021-11-07 01:59:48,093 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989658197] [2021-11-07 01:59:48,093 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-07 01:59:48,094 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:48,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-07 01:59:48,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73171, Invalid=77761, Unknown=0, NotChecked=0, Total=150932 [2021-11-07 01:59:48,111 INFO L87 Difference]: Start difference. First operand 264 states and 328 transitions. Second operand has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:01:57,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:01:57,668 INFO L93 Difference]: Finished difference Result 969 states and 1160 transitions. [2021-11-07 02:01:57,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 386 states. [2021-11-07 02:01:57,669 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 195 [2021-11-07 02:01:57,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:01:57,673 INFO L225 Difference]: With dead ends: 969 [2021-11-07 02:01:57,673 INFO L226 Difference]: Without dead ends: 903 [2021-11-07 02:01:57,712 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 1156 GetRequests, 200 SyntacticMatches, 189 SemanticMatches, 767 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147255 ImplicationChecksByTransitivity, 282.3s TimeCoverageRelationStatistics Valid=219471, Invalid=371121, Unknown=0, NotChecked=0, Total=590592 [2021-11-07 02:01:57,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 903 states. [2021-11-07 02:01:57,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 903 to 392. [2021-11-07 02:01:57,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 390 states have (on average 1.3333333333333333) internal successors, (520), 391 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:01:57,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 520 transitions. [2021-11-07 02:01:57,752 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 520 transitions. Word has length 195 [2021-11-07 02:01:57,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:01:57,753 INFO L470 AbstractCegarLoop]: Abstraction has 392 states and 520 transitions. [2021-11-07 02:01:57,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 385 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 02:01:57,754 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 520 transitions. [2021-11-07 02:01:57,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-07 02:01:57,758 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:01:57,758 INFO L513 BasicCegarLoop]: trace histogram [254, 1, 1, 1, 1, 1, 1] [2021-11-07 02:01:57,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-07 02:01:57,969 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-11-07 02:01:57,969 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:01:57,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:01:57,969 INFO L85 PathProgramCache]: Analyzing trace with hash 739524919, now seen corresponding path program 7 times [2021-11-07 02:01:57,969 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:01:57,969 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387606342] [2021-11-07 02:01:57,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:01:57,970 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:00,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:24,775 INFO L134 CoverageAnalysis]: Checked inductivity of 32385 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:02:24,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:24,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387606342] [2021-11-07 02:02:24,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387606342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:02:24,776 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159851452] [2021-11-07 02:02:24,776 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 02:02:24,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:02:24,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:02:24,790 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:02:24,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b9cefa67-f633-405a-8194-c1c8db3926b9/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 02:02:49,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:49,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 1820 conjuncts, 511 conjunts are in the unsatisfiable core [2021-11-07 02:02:49,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:24,840 INFO L134 CoverageAnalysis]: Checked inductivity of 32385 backedges. 0 proven. 32385 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 02:03:24,840 INFO L328 TraceCheckSpWp]: Computing backward predicates...