./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/diff-2-n-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/diff-2-n-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P --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 cb0d07e46dc94102f1a204dcfe0d8cca3d45653b0db7cea07d03c16ba8563271 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:52:03,701 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:52:03,703 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:52:03,738 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:52:03,739 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:52:03,743 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:52:03,746 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:52:03,750 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:52:03,753 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:52:03,759 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:52:03,760 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:52:03,762 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:52:03,762 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:52:03,765 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:52:03,767 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:52:03,769 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:52:03,771 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:52:03,772 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:52:03,776 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:52:03,784 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:52:03,786 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:52:03,787 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:52:03,790 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:52:03,791 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:52:03,800 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:52:03,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:52:03,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:52:03,803 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:52:03,804 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:52:03,805 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:52:03,806 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:52:03,807 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:52:03,809 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:52:03,810 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:52:03,812 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:52:03,812 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:52:03,813 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:52:03,813 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:52:03,814 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:52:03,815 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:52:03,815 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:52:03,816 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:52:03,862 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:52:03,863 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:52:03,863 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:52:03,864 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:52:03,865 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:52:03,865 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:52:03,865 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:52:03,866 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:52:03,866 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:52:03,866 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:52:03,867 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:52:03,867 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:52:03,868 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:52:03,868 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:52:03,868 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:52:03,868 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:52:03,869 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:52:03,869 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:52:03,870 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:52:03,870 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:52:03,870 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:52:03,870 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:52:03,870 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:52:03,871 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:52:03,871 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:52:03,871 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:52:03,872 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:52:03,873 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:52:03,873 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:52:03,874 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:52:03,874 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:52:03,874 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:52:03,875 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:03,875 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:52:03,875 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:52:03,875 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:52:03,876 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:52:03,876 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:52:03,876 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:52:03,876 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:52:03,877 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:52:03,877 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_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cb0d07e46dc94102f1a204dcfe0d8cca3d45653b0db7cea07d03c16ba8563271 [2021-11-21 01:52:04,132 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:52:04,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:52:04,171 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:52:04,172 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:52:04,173 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:52:04,174 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-multidimensional/diff-2-n-u.c [2021-11-21 01:52:04,244 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/data/1bc2d61b9/5b6d64ad027a4d8e99250c81d28d0aa9/FLAG2851469e8 [2021-11-21 01:52:04,705 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:52:04,707 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/sv-benchmarks/c/array-multidimensional/diff-2-n-u.c [2021-11-21 01:52:04,717 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/data/1bc2d61b9/5b6d64ad027a4d8e99250c81d28d0aa9/FLAG2851469e8 [2021-11-21 01:52:05,094 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/data/1bc2d61b9/5b6d64ad027a4d8e99250c81d28d0aa9 [2021-11-21 01:52:05,097 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:52:05,098 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:52:05,100 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:05,100 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:52:05,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:52:05,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,105 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f9e8402 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05, skipping insertion in model container [2021-11-21 01:52:05,105 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,112 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:52:05,127 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:52:05,288 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/sv-benchmarks/c/array-multidimensional/diff-2-n-u.c[322,335] [2021-11-21 01:52:05,311 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:05,319 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:52:05,331 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/sv-benchmarks/c/array-multidimensional/diff-2-n-u.c[322,335] [2021-11-21 01:52:05,343 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:52:05,357 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:52:05,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05 WrapperNode [2021-11-21 01:52:05,358 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:52:05,359 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:05,359 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:52:05,359 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:52:05,376 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,383 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,406 INFO L137 Inliner]: procedures = 14, calls = 27, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 109 [2021-11-21 01:52:05,407 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:52:05,407 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:52:05,408 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:52:05,408 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:52:05,416 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,417 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,419 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,420 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,426 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,432 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,434 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:52:05,437 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:52:05,438 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:52:05,438 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:52:05,439 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (1/1) ... [2021-11-21 01:52:05,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:52:05,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:05,475 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:52:05,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:52:05,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:52:05,518 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:52:05,519 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:52:05,519 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:52:05,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:52:05,519 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:52:05,519 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:52:05,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:52:05,579 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:52:05,581 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:52:05,741 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:52:05,810 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:52:05,826 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-21 01:52:05,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:05 BoogieIcfgContainer [2021-11-21 01:52:05,829 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:52:05,831 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:52:05,831 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:52:05,835 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:52:05,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:52:05" (1/3) ... [2021-11-21 01:52:05,851 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e96fdb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:05, skipping insertion in model container [2021-11-21 01:52:05,851 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:52:05" (2/3) ... [2021-11-21 01:52:05,852 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e96fdb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:52:05, skipping insertion in model container [2021-11-21 01:52:05,852 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:52:05" (3/3) ... [2021-11-21 01:52:05,853 INFO L111 eAbstractionObserver]: Analyzing ICFG diff-2-n-u.c [2021-11-21 01:52:05,874 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:52:05,875 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:52:05,946 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:52:05,954 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 [2021-11-21 01:52:05,956 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:52:05,980 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 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) [2021-11-21 01:52:05,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:52:05,986 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:05,990 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:05,991 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:06,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:06,002 INFO L85 PathProgramCache]: Analyzing trace with hash -1309612569, now seen corresponding path program 1 times [2021-11-21 01:52:06,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:06,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480817853] [2021-11-21 01:52:06,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:06,015 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:06,114 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:06,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1262373111] [2021-11-21 01:52:06,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:06,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:06,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:06,123 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:06,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:52:06,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:06,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:52:06,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:06,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:52:06,349 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:52:06,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:06,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480817853] [2021-11-21 01:52:06,351 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:52:06,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262373111] [2021-11-21 01:52:06,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262373111] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:06,353 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:06,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:52:06,355 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505409810] [2021-11-21 01:52:06,356 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:06,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:52:06,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:06,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:52:06,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:52:06,402 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 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) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:06,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:06,478 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2021-11-21 01:52:06,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:52:06,481 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 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 [2021-11-21 01:52:06,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:06,488 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:52:06,489 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:52:06,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:52:06,498 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:06,500 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 14 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:52:06,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:52:06,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-11-21 01:52:06,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:06,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 21 transitions. [2021-11-21 01:52:06,538 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 21 transitions. Word has length 8 [2021-11-21 01:52:06,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:06,539 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 21 transitions. [2021-11-21 01:52:06,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:06,539 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 21 transitions. [2021-11-21 01:52:06,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:52:06,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:06,540 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:06,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:06,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-21 01:52:06,755 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:06,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:06,760 INFO L85 PathProgramCache]: Analyzing trace with hash -215038707, now seen corresponding path program 1 times [2021-11-21 01:52:06,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:06,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124700405] [2021-11-21 01:52:06,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:06,762 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:06,775 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:06,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [27469609] [2021-11-21 01:52:06,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:06,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:06,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:06,781 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:06,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:52:06,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:06,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:52:06,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:06,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:52:06,924 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:52:06,924 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:06,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124700405] [2021-11-21 01:52:06,925 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:52:06,925 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27469609] [2021-11-21 01:52:06,925 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27469609] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:06,925 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:52:06,926 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:52:06,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228906005] [2021-11-21 01:52:06,926 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:06,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:52:06,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:06,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:52:06,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:52:06,928 INFO L87 Difference]: Start difference. First operand 14 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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) [2021-11-21 01:52:06,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:06,987 INFO L93 Difference]: Finished difference Result 37 states and 57 transitions. [2021-11-21 01:52:06,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:52:06,988 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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) Word has length 10 [2021-11-21 01:52:06,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:06,988 INFO L225 Difference]: With dead ends: 37 [2021-11-21 01:52:06,989 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:52:06,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:52:06,991 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 33 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:06,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 10 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:52:06,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:52:06,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18. [2021-11-21 01:52:06,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:06,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 25 transitions. [2021-11-21 01:52:06,998 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 25 transitions. Word has length 10 [2021-11-21 01:52:06,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:06,999 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 25 transitions. [2021-11-21 01:52:06,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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) [2021-11-21 01:52:06,999 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 25 transitions. [2021-11-21 01:52:06,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:52:07,000 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:07,000 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:07,037 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:07,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:07,214 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:07,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:07,215 INFO L85 PathProgramCache]: Analyzing trace with hash -1517764035, now seen corresponding path program 1 times [2021-11-21 01:52:07,215 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:07,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562503038] [2021-11-21 01:52:07,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:07,216 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:07,220 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:07,221 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2144946848] [2021-11-21 01:52:07,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:07,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:07,221 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:07,222 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:07,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:52:07,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:07,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:52:07,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:07,368 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:52:07,368 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:07,442 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:52:07,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:07,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562503038] [2021-11-21 01:52:07,443 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:52:07,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144946848] [2021-11-21 01:52:07,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144946848] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:07,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1071534200] [2021-11-21 01:52:07,465 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:52:07,465 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:07,470 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:07,475 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:07,476 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:07,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,700 INFO L354 Elim1Store]: treesize reduction 158, result has 23.7 percent of original size [2021-11-21 01:52:07,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 40 treesize of output 72 [2021-11-21 01:52:07,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:07,973 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 01:52:07,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 01:52:08,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:08,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:08,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 47 [2021-11-21 01:52:09,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:09,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:09,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:09,297 INFO L354 Elim1Store]: treesize reduction 130, result has 16.1 percent of original size [2021-11-21 01:52:09,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 347 treesize of output 322 [2021-11-21 01:52:09,992 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:10,005 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:10,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:10,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:10,281 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:10,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:10,737 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:11,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1071534200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:52:11,294 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:52:11,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 10 [2021-11-21 01:52:11,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882930952] [2021-11-21 01:52:11,295 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:52:11,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:52:11,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:11,296 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:52:11,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:52:11,296 INFO L87 Difference]: Start difference. First operand 18 states and 25 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:11,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:11,768 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2021-11-21 01:52:11,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:52:11,769 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-21 01:52:11,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:11,769 INFO L225 Difference]: With dead ends: 39 [2021-11-21 01:52:11,770 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 01:52:11,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=53, Invalid=79, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:52:11,772 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:11,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 9 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:52:11,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 01:52:11,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 20. [2021-11-21 01:52:11,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:11,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2021-11-21 01:52:11,783 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 11 [2021-11-21 01:52:11,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:11,783 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2021-11-21 01:52:11,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:11,784 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2021-11-21 01:52:11,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 01:52:11,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:11,785 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:11,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:12,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:12,002 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:12,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:12,003 INFO L85 PathProgramCache]: Analyzing trace with hash 862012475, now seen corresponding path program 1 times [2021-11-21 01:52:12,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:12,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230247169] [2021-11-21 01:52:12,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:12,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:12,008 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:12,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1352354486] [2021-11-21 01:52:12,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:12,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:12,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:12,010 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:12,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:52:12,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:52:12,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:52:12,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:12,120 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:52:12,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:12,166 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:52:12,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:12,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230247169] [2021-11-21 01:52:12,166 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:52:12,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352354486] [2021-11-21 01:52:12,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352354486] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:12,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [697126060] [2021-11-21 01:52:12,170 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:52:12,170 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:12,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:12,170 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:12,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:12,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,302 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 01:52:12,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 01:52:12,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,402 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 16 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 52 [2021-11-21 01:52:12,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:12,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 47 [2021-11-21 01:52:13,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:13,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:13,308 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:13,371 INFO L354 Elim1Store]: treesize reduction 130, result has 16.1 percent of original size [2021-11-21 01:52:13,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 347 treesize of output 322 [2021-11-21 01:52:13,977 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:13,989 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:13,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:14,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:14,261 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:14,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:14,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:14,831 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-21 01:52:14,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-21 01:52:14,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:14,961 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:14,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:15,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,064 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:15,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:15,287 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,299 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-21 01:52:15,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-21 01:52:15,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,385 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:15,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:15,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,538 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:15,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:15,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,807 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-21 01:52:15,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-21 01:52:15,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:15,899 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:15,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:15,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:16,000 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:16,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:16,275 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:16,277 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:16,304 INFO L354 Elim1Store]: treesize reduction 44, result has 49.4 percent of original size [2021-11-21 01:52:16,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 41 treesize of output 60 [2021-11-21 01:52:16,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:16,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:16,634 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:16,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:17,015 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,015 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,055 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:17,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:17,362 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,363 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,396 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:17,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:17,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:17,772 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:17,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:18,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:18,905 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:18,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:19,008 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:19,020 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:19,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:19,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:19,097 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:19,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:19,164 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:20,159 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:20,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:52:20,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-21 01:52:20,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55917595] [2021-11-21 01:52:20,160 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:20,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:52:20,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:20,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:52:20,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:52:20,162 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:20,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:20,310 INFO L93 Difference]: Finished difference Result 63 states and 89 transitions. [2021-11-21 01:52:20,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:52:20,310 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-21 01:52:20,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:20,311 INFO L225 Difference]: With dead ends: 63 [2021-11-21 01:52:20,311 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 01:52:20,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:52:20,312 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 44 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:20,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 16 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:52:20,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 01:52:20,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2021-11-21 01:52:20,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.2972972972972974) internal successors, (48), 37 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) [2021-11-21 01:52:20,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 48 transitions. [2021-11-21 01:52:20,331 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 48 transitions. Word has length 17 [2021-11-21 01:52:20,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:20,331 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 48 transitions. [2021-11-21 01:52:20,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:20,332 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 48 transitions. [2021-11-21 01:52:20,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:52:20,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:20,333 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:20,356 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:20,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:20,544 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:20,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:20,544 INFO L85 PathProgramCache]: Analyzing trace with hash 883853987, now seen corresponding path program 2 times [2021-11-21 01:52:20,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:20,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149569439] [2021-11-21 01:52:20,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:20,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:20,549 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:20,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [805244189] [2021-11-21 01:52:20,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:52:20,550 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:20,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:20,559 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:20,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:52:20,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:52:20,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:52:20,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:52:20,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:52:20,698 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:52:20,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:52:20,764 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:52:20,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:52:20,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149569439] [2021-11-21 01:52:20,765 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:52:20,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805244189] [2021-11-21 01:52:20,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805244189] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:52:20,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1872124258] [2021-11-21 01:52:20,771 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:52:20,771 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:52:20,771 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:52:20,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:52:20,772 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:52:20,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:20,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:20,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:20,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:20,920 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 01:52:20,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 01:52:20,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 16 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 52 [2021-11-21 01:52:21,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 60 treesize of output 47 [2021-11-21 01:52:21,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:52:21,876 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:21,916 INFO L354 Elim1Store]: treesize reduction 130, result has 16.1 percent of original size [2021-11-21 01:52:21,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 347 treesize of output 322 [2021-11-21 01:52:22,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:22,410 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:22,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:22,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:22,625 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:22,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,139 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,196 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,319 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,330 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,566 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-21 01:52:23,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-21 01:52:23,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,647 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,777 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:23,948 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:23,959 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:23,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:24,082 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,093 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:24,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:24,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,160 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:24,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:24,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,525 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:24,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:24,856 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,857 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:24,893 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:24,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:25,209 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:25,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:25,245 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:25,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:25,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:25,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:25,620 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:25,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:26,008 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:26,009 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:26,060 INFO L354 Elim1Store]: treesize reduction 52, result has 49.5 percent of original size [2021-11-21 01:52:26,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 53 treesize of output 72 [2021-11-21 01:52:27,112 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:27,122 INFO L354 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2021-11-21 01:52:27,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 31 [2021-11-21 01:52:27,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:27,195 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:27,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:27,317 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:52:27,332 INFO L354 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2021-11-21 01:52:27,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 57 treesize of output 39 [2021-11-21 01:52:27,395 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:52:28,369 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:52:28,370 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:52:28,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-21 01:52:28,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595020922] [2021-11-21 01:52:28,370 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:52:28,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:52:28,371 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:52:28,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:52:28,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:52:28,372 INFO L87 Difference]: Start difference. First operand 38 states and 48 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:28,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:52:28,538 INFO L93 Difference]: Finished difference Result 171 states and 219 transitions. [2021-11-21 01:52:28,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:52:28,539 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 01:52:28,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:52:28,541 INFO L225 Difference]: With dead ends: 171 [2021-11-21 01:52:28,542 INFO L226 Difference]: Without dead ends: 141 [2021-11-21 01:52:28,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:52:28,543 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 114 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:52:28,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 16 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:52:28,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-21 01:52:28,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 92. [2021-11-21 01:52:28,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.2197802197802199) internal successors, (111), 91 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:28,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 111 transitions. [2021-11-21 01:52:28,573 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 111 transitions. Word has length 26 [2021-11-21 01:52:28,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:52:28,573 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 111 transitions. [2021-11-21 01:52:28,573 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:52:28,574 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 111 transitions. [2021-11-21 01:52:28,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:52:28,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:52:28,577 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:52:28,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:52:28,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:28,792 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:52:28,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:52:28,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1008971561, now seen corresponding path program 3 times [2021-11-21 01:52:28,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:52:28,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1174629568] [2021-11-21 01:52:28,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:52:28,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:52:28,801 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:52:28,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [16774829] [2021-11-21 01:52:28,802 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:52:28,802 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:52:28,802 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:52:28,803 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:52:28,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_78637ee8-4a93-4a0d-afd9-c9148d6a9485/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process