./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-patterns/array3_pattern.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_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/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_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-patterns/array3_pattern.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/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_dc630645-b2ee-46a4-acc4-47f71ee5a596/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 8c9f77a5f5cfb41429e6b2e557580f5f8a855ca718c241fb5a07541ef3b21ab2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:58:02,025 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:58:02,027 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:58:02,063 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:58:02,063 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:58:02,065 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:58:02,066 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:58:02,069 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:58:02,071 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:58:02,072 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:58:02,074 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:58:02,075 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:58:02,076 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:58:02,077 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:58:02,079 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:58:02,080 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:58:02,081 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:58:02,083 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:58:02,085 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:58:02,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:58:02,089 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:58:02,092 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:58:02,094 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:58:02,095 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:58:02,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:58:02,099 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:58:02,099 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:58:02,100 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:58:02,101 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:58:02,102 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:58:02,102 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:58:02,103 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:58:02,104 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:58:02,105 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:58:02,106 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:58:02,107 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:58:02,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:58:02,108 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:58:02,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:58:02,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:58:02,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:58:02,112 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:58:02,136 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:58:02,136 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:58:02,137 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:58:02,137 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:58:02,138 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:58:02,139 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:58:02,139 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:58:02,139 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:58:02,140 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:58:02,140 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:58:02,140 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:58:02,141 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:58:02,141 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:58:02,142 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:58:02,142 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:58:02,142 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:58:02,143 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:58:02,143 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:58:02,144 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:58:02,144 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:58:02,145 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:58:02,145 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:58:02,146 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:58:02,146 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:58:02,146 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:58:02,147 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:58:02,147 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:58:02,147 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:58:02,148 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:58:02,148 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:58:02,149 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:58:02,149 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:58:02,149 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:02,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:58:02,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:58:02,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:58:02,154 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:58:02,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:58:02,155 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:58:02,155 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:58:02,155 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:58:02,156 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_dc630645-b2ee-46a4-acc4-47f71ee5a596/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8c9f77a5f5cfb41429e6b2e557580f5f8a855ca718c241fb5a07541ef3b21ab2 [2021-11-21 01:58:02,452 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:58:02,486 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:58:02,488 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:58:02,490 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:58:02,491 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:58:02,492 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-patterns/array3_pattern.c [2021-11-21 01:58:02,564 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/data/f4968b24f/756769b1b60a47d893f2258e01c7392b/FLAG8fd05d41d [2021-11-21 01:58:03,025 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:58:03,026 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/sv-benchmarks/c/array-patterns/array3_pattern.c [2021-11-21 01:58:03,034 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/data/f4968b24f/756769b1b60a47d893f2258e01c7392b/FLAG8fd05d41d [2021-11-21 01:58:03,411 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/data/f4968b24f/756769b1b60a47d893f2258e01c7392b [2021-11-21 01:58:03,414 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:58:03,415 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:58:03,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:03,419 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:58:03,422 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:58:03,423 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,424 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6090e173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03, skipping insertion in model container [2021-11-21 01:58:03,424 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,431 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:58:03,448 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:58:03,634 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_dc630645-b2ee-46a4-acc4-47f71ee5a596/sv-benchmarks/c/array-patterns/array3_pattern.c[1393,1406] [2021-11-21 01:58:03,678 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:03,685 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:58:03,704 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_dc630645-b2ee-46a4-acc4-47f71ee5a596/sv-benchmarks/c/array-patterns/array3_pattern.c[1393,1406] [2021-11-21 01:58:03,733 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:58:03,751 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:58:03,752 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03 WrapperNode [2021-11-21 01:58:03,752 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:58:03,753 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:03,753 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:58:03,753 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:58:03,761 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,777 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,809 INFO L137 Inliner]: procedures = 17, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 88 [2021-11-21 01:58:03,810 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:58:03,811 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:58:03,811 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:58:03,811 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:58:03,820 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,820 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,826 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,827 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,844 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,847 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,849 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,851 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:58:03,852 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:58:03,852 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:58:03,852 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:58:03,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (1/1) ... [2021-11-21 01:58:03,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:58:03,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:03,894 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:58:03,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:58:03,949 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:58:03,949 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:58:03,950 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:58:03,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:58:03,950 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:58:03,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:58:03,950 INFO L130 BoogieDeclarations]: Found specification of procedure square [2021-11-21 01:58:03,950 INFO L138 BoogieDeclarations]: Found implementation of procedure square [2021-11-21 01:58:03,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:58:03,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:58:03,951 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:58:03,951 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:58:04,042 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:58:04,043 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:58:04,225 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:58:04,273 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:58:04,274 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:58:04,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:04 BoogieIcfgContainer [2021-11-21 01:58:04,276 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:58:04,278 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:58:04,278 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:58:04,294 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:58:04,295 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:58:03" (1/3) ... [2021-11-21 01:58:04,295 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6be19b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:04, skipping insertion in model container [2021-11-21 01:58:04,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:58:03" (2/3) ... [2021-11-21 01:58:04,296 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6be19b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:58:04, skipping insertion in model container [2021-11-21 01:58:04,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:58:04" (3/3) ... [2021-11-21 01:58:04,297 INFO L111 eAbstractionObserver]: Analyzing ICFG array3_pattern.c [2021-11-21 01:58:04,303 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:58:04,303 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:58:04,354 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:58:04,360 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 01:58:04,361 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:58:04,377 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:04,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-21 01:58:04,382 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:04,382 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:04,383 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:04,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:04,387 INFO L85 PathProgramCache]: Analyzing trace with hash 168211832, now seen corresponding path program 1 times [2021-11-21 01:58:04,395 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:04,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673022676] [2021-11-21 01:58:04,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:04,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:04,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:04,584 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 01:58:04,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:04,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673022676] [2021-11-21 01:58:04,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673022676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:04,586 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:04,586 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:58:04,588 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544593609] [2021-11-21 01:58:04,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:04,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 01:58:04,593 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:04,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 01:58:04,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:04,620 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:58:04,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:04,659 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-11-21 01:58:04,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 01:58:04,662 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-11-21 01:58:04,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:04,669 INFO L225 Difference]: With dead ends: 36 [2021-11-21 01:58:04,669 INFO L226 Difference]: Without dead ends: 21 [2021-11-21 01:58:04,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 01:58:04,676 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:04,677 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:04,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-21 01:58:04,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-21 01:58:04,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:04,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-21 01:58:04,713 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 11 [2021-11-21 01:58:04,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:04,714 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-21 01:58:04,715 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:58:04,715 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-21 01:58:04,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 01:58:04,716 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:04,717 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:04,717 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:58:04,717 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:04,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:04,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1604099434, now seen corresponding path program 1 times [2021-11-21 01:58:04,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:04,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657550714] [2021-11-21 01:58:04,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:04,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:04,761 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:04,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1392612955] [2021-11-21 01:58:04,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:04,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:04,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:04,765 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:04,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:58:04,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:04,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:58:04,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:05,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:05,022 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:05,022 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:05,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657550714] [2021-11-21 01:58:05,023 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:05,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392612955] [2021-11-21 01:58:05,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392612955] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:05,024 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:05,024 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:58:05,025 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50264387] [2021-11-21 01:58:05,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:05,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:58:05,026 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:05,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:58:05,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:58:05,027 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:05,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:05,070 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-11-21 01:58:05,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:58:05,071 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-11-21 01:58:05,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:05,072 INFO L225 Difference]: With dead ends: 27 [2021-11-21 01:58:05,072 INFO L226 Difference]: Without dead ends: 24 [2021-11-21 01:58:05,073 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:05,077 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 4 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:05,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 45 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:58:05,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-21 01:58:05,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2021-11-21 01:58:05,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:05,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-21 01:58:05,091 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 16 [2021-11-21 01:58:05,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:05,092 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-21 01:58:05,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-21 01:58:05,093 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-21 01:58:05,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:58:05,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:05,094 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:05,120 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-21 01:58:05,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:05,301 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:05,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:05,302 INFO L85 PathProgramCache]: Analyzing trace with hash -874793495, now seen corresponding path program 1 times [2021-11-21 01:58:05,302 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:05,303 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844732678] [2021-11-21 01:58:05,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:05,303 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:05,330 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:05,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [658725139] [2021-11-21 01:58:05,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:05,331 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:05,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:05,333 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:05,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:58:05,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:05,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:58:05,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:05,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:05,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:58:05,615 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:05,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844732678] [2021-11-21 01:58:05,616 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:05,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658725139] [2021-11-21 01:58:05,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658725139] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:58:05,621 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:58:05,621 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-21 01:58:05,622 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136361233] [2021-11-21 01:58:05,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:58:05,623 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:58:05,623 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:05,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:58:05,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:58:05,625 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 01:58:05,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:05,735 INFO L93 Difference]: Finished difference Result 45 states and 54 transitions. [2021-11-21 01:58:05,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:58:05,736 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 25 [2021-11-21 01:58:05,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:05,741 INFO L225 Difference]: With dead ends: 45 [2021-11-21 01:58:05,741 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:58:05,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:58:05,746 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:05,749 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 50 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:05,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:58:05,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-11-21 01:58:05,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:05,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-11-21 01:58:05,766 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 25 [2021-11-21 01:58:05,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:05,766 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-11-21 01:58:05,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-21 01:58:05,768 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-11-21 01:58:05,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:58:05,769 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:05,770 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:05,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:05,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:05,997 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:05,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:05,998 INFO L85 PathProgramCache]: Analyzing trace with hash -578077241, now seen corresponding path program 1 times [2021-11-21 01:58:05,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:05,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932658844] [2021-11-21 01:58:05,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:05,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:06,025 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:06,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1996401767] [2021-11-21 01:58:06,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:06,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:06,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:06,027 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:06,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:58:06,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:06,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 01:58:06,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:06,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:58:06,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:58:06,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:07,065 INFO L354 Elim1Store]: treesize reduction 393, result has 10.9 percent of original size [2021-11-21 01:58:07,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 219 treesize of output 163 [2021-11-21 01:58:07,119 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:07,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:07,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:07,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:07,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 118 treesize of output 67 [2021-11-21 01:58:08,342 INFO L354 Elim1Store]: treesize reduction 87, result has 7.4 percent of original size [2021-11-21 01:58:08,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 36 [2021-11-21 01:58:08,574 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:58:08,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:18,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:18,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932658844] [2021-11-21 01:58:18,470 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:18,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996401767] [2021-11-21 01:58:18,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996401767] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:18,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1056591076] [2021-11-21 01:58:18,489 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:58:18,490 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:18,494 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:18,499 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:18,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:18,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,927 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:18,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:18,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:18,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:58:19,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 11 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 34 [2021-11-21 01:58:19,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2021-11-21 01:58:19,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:19,397 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:19,398 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:19,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:19,508 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:58:19,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 322 treesize of output 320 [2021-11-21 01:58:20,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:20,542 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:20,542 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 42 treesize of output 25 [2021-11-21 01:58:20,978 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:20,979 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:20,983 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:21,138 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:21,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:21,191 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:21,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:58:21,299 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:58:21,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:58:29,978 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:58:30,005 INFO L197 IcfgInterpreter]: Interpreting procedure square with input of size 34 for LOIs [2021-11-21 01:58:30,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:32,368 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:32,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:58:32,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-11-21 01:58:32,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041624732] [2021-11-21 01:58:32,368 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:32,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:58:32,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:32,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:58:32,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1961, Unknown=1, NotChecked=0, Total=2162 [2021-11-21 01:58:32,371 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:32,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:32,480 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2021-11-21 01:58:32,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-21 01:58:32,482 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 26 [2021-11-21 01:58:32,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:32,484 INFO L225 Difference]: With dead ends: 44 [2021-11-21 01:58:32,484 INFO L226 Difference]: Without dead ends: 41 [2021-11-21 01:58:32,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=211, Invalid=2044, Unknown=1, NotChecked=0, Total=2256 [2021-11-21 01:58:32,487 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 69 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:32,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 111 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 69 Unchecked, 0.1s Time] [2021-11-21 01:58:32,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-21 01:58:32,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2021-11-21 01:58:32,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 26 states have internal predecessors, (31), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-21 01:58:32,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2021-11-21 01:58:32,496 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 26 [2021-11-21 01:58:32,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:32,496 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2021-11-21 01:58:32,497 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 4 states have call successors, (4), 3 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-21 01:58:32,497 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2021-11-21 01:58:32,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:58:32,498 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:32,498 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:32,533 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:32,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-21 01:58:32,716 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:32,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:32,716 INFO L85 PathProgramCache]: Analyzing trace with hash 30192041, now seen corresponding path program 2 times [2021-11-21 01:58:32,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:32,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055036100] [2021-11-21 01:58:32,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:32,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:32,739 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:32,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [408287114] [2021-11-21 01:58:32,739 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:58:32,740 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:32,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:32,741 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:32,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:58:32,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:58:32,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:58:32,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:58:32,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:32,896 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:58:32,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:32,965 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:58:32,966 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:32,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055036100] [2021-11-21 01:58:32,966 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:32,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408287114] [2021-11-21 01:58:32,966 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [408287114] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:58:32,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1685223998] [2021-11-21 01:58:32,969 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:58:32,969 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:32,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:32,970 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:32,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:33,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:33,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:33,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:33,354 INFO L354 Elim1Store]: treesize reduction 170, result has 28.9 percent of original size [2021-11-21 01:58:33,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 127 [2021-11-21 01:58:33,425 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:33,482 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:33,591 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:33,627 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:34,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,145 INFO L354 Elim1Store]: treesize reduction 8, result has 80.5 percent of original size [2021-11-21 01:58:34,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 5 case distinctions, treesize of input 287 treesize of output 295 [2021-11-21 01:58:34,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,466 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:34,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:34,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:58:34,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,856 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:34,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:34,859 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:34,902 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:58:34,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 329 treesize of output 315 [2021-11-21 01:58:35,352 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:35,364 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:35,365 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 42 treesize of output 25 [2021-11-21 01:58:35,860 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:35,862 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:35,865 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:35,982 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:35,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:36,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:58:36,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 33 [2021-11-21 01:58:36,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:36,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 33 [2021-11-21 01:58:45,363 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:58:45,391 INFO L197 IcfgInterpreter]: Interpreting procedure square with input of size 34 for LOIs [2021-11-21 01:58:45,407 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:58:46,594 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:58:46,594 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:58:46,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-11-21 01:58:46,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848299958] [2021-11-21 01:58:46,595 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:58:46,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:58:46,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:58:46,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:58:46,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:58:46,597 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-21 01:58:46,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:58:46,788 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-11-21 01:58:46,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:58:46,789 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 27 [2021-11-21 01:58:46,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:58:46,790 INFO L225 Difference]: With dead ends: 69 [2021-11-21 01:58:46,790 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 01:58:46,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=158, Invalid=898, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 01:58:46,792 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 38 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:58:46,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 60 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:58:46,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 01:58:46,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 55. [2021-11-21 01:58:46,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 38 states have internal predecessors, (42), 12 states have call successors, (12), 6 states have call predecessors, (12), 6 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 01:58:46,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2021-11-21 01:58:46,814 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 27 [2021-11-21 01:58:46,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:58:46,815 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2021-11-21 01:58:46,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 9 states have internal predecessors, (24), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-21 01:58:46,815 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2021-11-21 01:58:46,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-21 01:58:46,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:58:46,817 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:58:46,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:58:47,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:47,024 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:58:47,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:58:47,025 INFO L85 PathProgramCache]: Analyzing trace with hash 2115367227, now seen corresponding path program 1 times [2021-11-21 01:58:47,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:58:47,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010002430] [2021-11-21 01:58:47,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:47,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:58:47,035 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:58:47,035 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1284385369] [2021-11-21 01:58:47,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:58:47,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:58:47,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:58:47,060 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:58:47,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:58:47,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:58:47,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-21 01:58:47,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:58:47,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:58:47,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:58:47,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:47,663 INFO L354 Elim1Store]: treesize reduction 416, result has 7.3 percent of original size [2021-11-21 01:58:47,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 232 treesize of output 153 [2021-11-21 01:58:47,705 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:47,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:47,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 115 treesize of output 79 [2021-11-21 01:58:48,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,082 INFO L354 Elim1Store]: treesize reduction 408, result has 7.5 percent of original size [2021-11-21 01:58:48,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 219 treesize of output 148 [2021-11-21 01:58:48,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:48,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 36 [2021-11-21 01:58:48,934 INFO L354 Elim1Store]: treesize reduction 87, result has 7.4 percent of original size [2021-11-21 01:58:48,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 61 treesize of output 36 [2021-11-21 01:58:49,176 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:58:49,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:58:57,081 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:58:57,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010002430] [2021-11-21 01:58:57,081 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:58:57,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1284385369] [2021-11-21 01:58:57,081 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1284385369] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:58:57,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253136541] [2021-11-21 01:58:57,084 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:58:57,084 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:58:57,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:58:57,085 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:58:57,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:58:57,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,353 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:58:57,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:58:57,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:58:57,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 52 treesize of output 38 [2021-11-21 01:58:57,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:58:57,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:57,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:57,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:57,805 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:58:57,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 329 treesize of output 315 [2021-11-21 01:58:58,248 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:58,262 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:58:58,263 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 42 treesize of output 25 [2021-11-21 01:58:58,781 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:58,781 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:58,785 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:58,906 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:58,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:58,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:58:58,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 69 [2021-11-21 01:58:59,045 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:58:59,074 INFO L354 Elim1Store]: treesize reduction 26, result has 3.7 percent of original size [2021-11-21 01:58:59,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 23 [2021-11-21 01:58:59,616 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:58:59,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:58:59,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 23 [2021-11-21 01:58:59,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:58:59,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:58:59,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 94 treesize of output 56 [2021-11-21 01:59:09,122 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:09,145 INFO L197 IcfgInterpreter]: Interpreting procedure square with input of size 34 for LOIs [2021-11-21 01:59:09,167 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:12,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:12,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:59:12,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-11-21 01:59:12,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339704125] [2021-11-21 01:59:12,107 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:12,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:59:12,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:12,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:59:12,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=2047, Unknown=0, NotChecked=0, Total=2256 [2021-11-21 01:59:12,109 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand has 20 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 01:59:12,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:12,866 INFO L93 Difference]: Finished difference Result 67 states and 77 transitions. [2021-11-21 01:59:12,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:59:12,866 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) Word has length 32 [2021-11-21 01:59:12,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:12,868 INFO L225 Difference]: With dead ends: 67 [2021-11-21 01:59:12,868 INFO L226 Difference]: Without dead ends: 64 [2021-11-21 01:59:12,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=282, Invalid=2474, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 01:59:12,870 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 19 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:12,870 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 151 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 62 Invalid, 0 Unknown, 116 Unchecked, 0.1s Time] [2021-11-21 01:59:12,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-21 01:59:12,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 46. [2021-11-21 01:59:12,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 31 states have internal predecessors, (35), 9 states have call successors, (9), 6 states have call predecessors, (9), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-21 01:59:12,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2021-11-21 01:59:12,891 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 32 [2021-11-21 01:59:12,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:12,892 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2021-11-21 01:59:12,892 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 14 states have (on average 1.5) internal successors, (21), 15 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-21 01:59:12,892 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2021-11-21 01:59:12,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:59:12,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:12,896 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:12,934 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:13,124 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,125 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:13,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:13,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1089524180, now seen corresponding path program 3 times [2021-11-21 01:59:13,125 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:13,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607651872] [2021-11-21 01:59:13,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:13,125 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:13,139 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:13,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [681001383] [2021-11-21 01:59:13,147 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:59:13,147 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:13,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:13,148 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:13,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:59:13,232 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:59:13,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:13,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:59:13,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:13,338 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 17 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:59:13,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:13,431 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 01:59:13,431 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:13,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607651872] [2021-11-21 01:59:13,431 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-21 01:59:13,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681001383] [2021-11-21 01:59:13,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681001383] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:13,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919743207] [2021-11-21 01:59:13,434 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2021-11-21 01:59:13,434 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:13,434 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:13,434 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:13,434 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:13,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,691 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:59:13,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:59:13,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,762 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 2 stores, 3 select indices, 3 select index equivalence classes, 11 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 99 [2021-11-21 01:59:13,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 33 [2021-11-21 01:59:13,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:13,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 35 [2021-11-21 01:59:14,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:14,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:14,078 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,079 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,080 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,149 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 01:59:14,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 322 treesize of output 320 [2021-11-21 01:59:14,784 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:14,796 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:59:14,796 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 42 treesize of output 25 [2021-11-21 01:59:15,236 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:15,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:15,243 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-21 01:59:15,400 INFO L354 Elim1Store]: treesize reduction 85, result has 55.5 percent of original size [2021-11-21 01:59:15,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 232 treesize of output 209 [2021-11-21 01:59:15,610 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:15,611 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:59:15,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 89 [2021-11-21 01:59:15,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:15,693 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:59:15,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 104 treesize of output 66 [2021-11-21 01:59:15,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 104 treesize of output 66 [2021-11-21 01:59:25,050 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 20 for LOIs [2021-11-21 01:59:25,069 INFO L197 IcfgInterpreter]: Interpreting procedure square with input of size 34 for LOIs [2021-11-21 01:59:25,099 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:26,365 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:26,365 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:59:26,366 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-11-21 01:59:26,366 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13569643] [2021-11-21 01:59:26,366 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:26,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:59:26,367 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:26,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:59:26,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=638, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:59:26,368 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 5 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 01:59:26,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:26,578 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2021-11-21 01:59:26,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:59:26,579 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 5 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 35 [2021-11-21 01:59:26,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:26,580 INFO L225 Difference]: With dead ends: 62 [2021-11-21 01:59:26,581 INFO L226 Difference]: Without dead ends: 35 [2021-11-21 01:59:26,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=140, Invalid=790, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:59:26,582 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:26,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 75 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:26,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-21 01:59:26,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 31. [2021-11-21 01:59:26,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-21 01:59:26,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2021-11-21 01:59:26,589 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 35 [2021-11-21 01:59:26,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:26,589 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2021-11-21 01:59:26,590 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 5 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 01:59:26,590 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2021-11-21 01:59:26,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 01:59:26,591 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:26,591 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:26,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:26,816 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:26,817 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:26,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:26,817 INFO L85 PathProgramCache]: Analyzing trace with hash 2056583306, now seen corresponding path program 4 times [2021-11-21 01:59:26,817 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:26,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368480739] [2021-11-21 01:59:26,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:26,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:26,843 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-21 01:59:26,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [356394875] [2021-11-21 01:59:26,844 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:59:26,844 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:26,844 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:26,850 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:26,853 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dc630645-b2ee-46a4-acc4-47f71ee5a596/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:59:27,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:27,040 WARN L261 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-21 01:59:27,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:27,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-21 01:59:27,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:59:27,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:27,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:27,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 45 [2021-11-21 01:59:27,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:27,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:27,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:27,742 INFO L354 Elim1Store]: treesize reduction 566, result has 18.7 percent of original size [2021-11-21 01:59:27,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 7 select indices, 7 select index equivalence classes, 3 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 17 case distinctions, treesize of input 240 treesize of output 254