./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/sep.i --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_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/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_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/sep.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/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_c6ae2233-e721-4eac-990f-fb7400ab0a83/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 54d2da4a9e5a645ffa7361038eff25cc32e29a265e0324de9bda9a6d773becac --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:49:38,557 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:49:38,559 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:49:38,607 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:49:38,607 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:49:38,612 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:49:38,614 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:49:38,616 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:49:38,618 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:49:38,619 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:49:38,620 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:49:38,621 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:49:38,622 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:49:38,623 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:49:38,624 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:49:38,626 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:49:38,627 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:49:38,628 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:49:38,630 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:49:38,633 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:49:38,635 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:49:38,636 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:49:38,638 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:49:38,639 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:49:38,642 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:49:38,643 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:49:38,643 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:49:38,644 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:49:38,645 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:49:38,646 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:49:38,646 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:49:38,647 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:49:38,648 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:49:38,649 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:49:38,650 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:49:38,651 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:49:38,652 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:49:38,652 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:49:38,652 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:49:38,653 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:49:38,654 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:49:38,655 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:49:38,681 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:49:38,681 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:49:38,682 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:49:38,682 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:49:38,683 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:49:38,683 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:49:38,683 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:49:38,684 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:49:38,684 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:49:38,684 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:49:38,684 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:49:38,684 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:49:38,685 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:49:38,685 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:49:38,685 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:49:38,697 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:49:38,698 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:49:38,698 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:49:38,699 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:49:38,699 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:49:38,699 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:49:38,699 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:49:38,699 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:49:38,700 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:49:38,700 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:49:38,700 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:49:38,700 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:49:38,700 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:49:38,701 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:49:38,701 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:49:38,701 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:49:38,701 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:49:38,701 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:38,702 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:49:38,702 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:49:38,702 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:49:38,702 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:49:38,703 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:49:38,703 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:49:38,703 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:49:38,703 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:49:38,703 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_c6ae2233-e721-4eac-990f-fb7400ab0a83/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 54d2da4a9e5a645ffa7361038eff25cc32e29a265e0324de9bda9a6d773becac [2021-11-20 23:49:38,934 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:49:38,955 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:49:38,958 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:49:38,959 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:49:38,960 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:49:38,961 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/reducercommutativity/sep.i [2021-11-20 23:49:39,026 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/data/6badc194a/acbca40f3686405782d4534d390780f0/FLAGe9f0e2796 [2021-11-20 23:49:39,490 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:49:39,491 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/sv-benchmarks/c/reducercommutativity/sep.i [2021-11-20 23:49:39,497 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/data/6badc194a/acbca40f3686405782d4534d390780f0/FLAGe9f0e2796 [2021-11-20 23:49:39,880 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/data/6badc194a/acbca40f3686405782d4534d390780f0 [2021-11-20 23:49:39,883 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:49:39,887 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:49:39,890 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:39,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:49:39,894 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:49:39,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:39" (1/1) ... [2021-11-20 23:49:39,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67a02c1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:39, skipping insertion in model container [2021-11-20 23:49:39,896 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:49:39" (1/1) ... [2021-11-20 23:49:39,903 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:49:39,916 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:49:40,111 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_c6ae2233-e721-4eac-990f-fb7400ab0a83/sv-benchmarks/c/reducercommutativity/sep.i[1298,1311] [2021-11-20 23:49:40,114 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:40,121 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:49:40,139 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_c6ae2233-e721-4eac-990f-fb7400ab0a83/sv-benchmarks/c/reducercommutativity/sep.i[1298,1311] [2021-11-20 23:49:40,140 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:49:40,153 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:49:40,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40 WrapperNode [2021-11-20 23:49:40,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:49:40,155 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:40,155 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:49:40,156 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:49:40,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,171 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,191 INFO L137 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 65 [2021-11-20 23:49:40,192 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:49:40,192 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:49:40,193 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:49:40,193 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:49:40,201 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,204 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,205 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,211 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,215 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,217 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,219 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:49:40,220 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:49:40,220 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:49:40,221 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:49:40,222 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (1/1) ... [2021-11-20 23:49:40,230 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:49:40,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:40,272 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:49:40,280 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:49:40,323 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:49:40,323 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:49:40,324 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:49:40,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:49:40,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:49:40,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:49:40,325 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:49:40,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:49:40,325 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2021-11-20 23:49:40,325 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2021-11-20 23:49:40,388 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:49:40,390 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:49:40,627 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:49:40,663 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:49:40,663 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-20 23:49:40,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:40 BoogieIcfgContainer [2021-11-20 23:49:40,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:49:40,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:49:40,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:49:40,670 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:49:40,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:49:39" (1/3) ... [2021-11-20 23:49:40,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47980210 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:40, skipping insertion in model container [2021-11-20 23:49:40,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:49:40" (2/3) ... [2021-11-20 23:49:40,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47980210 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:49:40, skipping insertion in model container [2021-11-20 23:49:40,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:49:40" (3/3) ... [2021-11-20 23:49:40,673 INFO L111 eAbstractionObserver]: Analyzing ICFG sep.i [2021-11-20 23:49:40,678 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:49:40,679 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:49:40,723 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:49:40,731 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 [2021-11-20 23:49:40,731 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:49:40,752 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:49:40,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 23:49:40,772 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:40,773 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:40,773 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:40,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:40,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1650253394, now seen corresponding path program 1 times [2021-11-20 23:49:40,788 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:40,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55360492] [2021-11-20 23:49:40,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:40,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:40,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:41,025 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:49:41,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:41,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55360492] [2021-11-20 23:49:41,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55360492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:41,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456882993] [2021-11-20 23:49:41,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:41,028 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:41,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:41,030 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:41,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:49:41,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:41,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:49:41,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:41,248 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:49:41,249 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:49:41,249 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456882993] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:41,250 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:49:41,250 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2021-11-20 23:49:41,252 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510742704] [2021-11-20 23:49:41,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:41,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:49:41,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:41,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:49:41,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:41,301 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:49:41,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:41,388 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-11-20 23:49:41,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:49:41,391 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2021-11-20 23:49:41,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:41,407 INFO L225 Difference]: With dead ends: 36 [2021-11-20 23:49:41,412 INFO L226 Difference]: Without dead ends: 16 [2021-11-20 23:49:41,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:49:41,422 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 18 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:41,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 23 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:41,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-20 23:49:41,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-20 23:49:41,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:49:41,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-11-20 23:49:41,475 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 20 [2021-11-20 23:49:41,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:41,477 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-11-20 23:49:41,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:49:41,478 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-11-20 23:49:41,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:49:41,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:41,481 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:41,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:41,696 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-20 23:49:41,696 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:41,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:41,698 INFO L85 PathProgramCache]: Analyzing trace with hash -1140555386, now seen corresponding path program 1 times [2021-11-20 23:49:41,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:41,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258105919] [2021-11-20 23:49:41,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:41,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:41,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:41,835 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:49:41,835 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:41,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258105919] [2021-11-20 23:49:41,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258105919] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:49:41,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:49:41,837 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:49:41,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033675896] [2021-11-20 23:49:41,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:49:41,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:49:41,838 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:41,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:49:41,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:49:41,840 INFO L87 Difference]: Start difference. First operand 16 states and 19 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, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:49:41,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:41,890 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-20 23:49:41,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:49:41,890 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, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-11-20 23:49:41,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:41,897 INFO L225 Difference]: With dead ends: 26 [2021-11-20 23:49:41,897 INFO L226 Difference]: Without dead ends: 17 [2021-11-20 23:49:41,898 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:49:41,900 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 13 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:41,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 18 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:41,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-11-20 23:49:41,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-11-20 23:49:41,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:49:41,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-11-20 23:49:41,915 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 23 [2021-11-20 23:49:41,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:41,917 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-11-20 23:49:41,917 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, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-20 23:49:41,917 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-11-20 23:49:41,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-20 23:49:41,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:41,918 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:41,919 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:49:41,919 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:41,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:41,920 INFO L85 PathProgramCache]: Analyzing trace with hash -1719425358, now seen corresponding path program 1 times [2021-11-20 23:49:41,920 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:41,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775499332] [2021-11-20 23:49:41,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:41,923 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:42,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:42,102 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:42,103 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:42,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775499332] [2021-11-20 23:49:42,104 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775499332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:42,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086523695] [2021-11-20 23:49:42,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:42,109 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:42,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:42,112 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:42,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:49:42,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:42,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:49:42,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:42,335 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:42,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:42,507 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-20 23:49:42,507 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086523695] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:49:42,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [956330632] [2021-11-20 23:49:42,528 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:49:42,529 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:42,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:42,541 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:42,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:42,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:42,754 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-20 23:49:42,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-20 23:49:42,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:42,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:42,810 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:42,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:43,571 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:43,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:49:43,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:43,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:49:43,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:43,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:43,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:43,954 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:49:43,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 88 [2021-11-20 23:49:44,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:44,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:49:44,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:49:44,802 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:49:45,004 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:49:45,985 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:49:45,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:49:45,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2021-11-20 23:49:45,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406049167] [2021-11-20 23:49:45,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:49:45,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-20 23:49:45,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:49:45,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-20 23:49:45,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:49:45,988 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:49:46,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:49:46,048 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-11-20 23:49:46,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:49:46,049 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) Word has length 24 [2021-11-20 23:49:46,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:49:46,050 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:49:46,050 INFO L226 Difference]: Without dead ends: 18 [2021-11-20 23:49:46,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:49:46,052 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 15 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:49:46,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 36 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:49:46,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-20 23:49:46,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-11-20 23:49:46,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:49:46,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-11-20 23:49:46,057 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 24 [2021-11-20 23:49:46,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:49:46,057 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-11-20 23:49:46,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (6), 1 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:49:46,058 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-11-20 23:49:46,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:49:46,058 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:49:46,059 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:49:46,095 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:49:46,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:46,259 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:49:46,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:49:46,260 INFO L85 PathProgramCache]: Analyzing trace with hash -2012504714, now seen corresponding path program 2 times [2021-11-20 23:49:46,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:49:46,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197959561] [2021-11-20 23:49:46,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:49:46,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:49:46,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:49:50,464 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 1 proven. 37 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 23:49:50,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:49:50,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197959561] [2021-11-20 23:49:50,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197959561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:50,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [683636684] [2021-11-20 23:49:50,465 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:49:50,465 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:49:50,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:49:50,469 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:49:50,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:49:50,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:49:50,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:49:50,708 WARN L261 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 83 conjunts are in the unsatisfiable core [2021-11-20 23:49:50,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:49:51,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:51,413 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:49:51,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 115 treesize of output 73 [2021-11-20 23:49:52,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:52,916 INFO L354 Elim1Store]: treesize reduction 55, result has 16.7 percent of original size [2021-11-20 23:49:52,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 203 treesize of output 149 [2021-11-20 23:49:53,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:53,271 INFO L354 Elim1Store]: treesize reduction 96, result has 36.0 percent of original size [2021-11-20 23:49:53,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 176 treesize of output 187 [2021-11-20 23:49:54,397 INFO L354 Elim1Store]: treesize reduction 22, result has 12.0 percent of original size [2021-11-20 23:49:54,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 321 treesize of output 208 [2021-11-20 23:49:54,841 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:49:54,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:49:58,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [683636684] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:49:58,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335877626] [2021-11-20 23:49:58,883 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:49:58,884 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:49:58,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:49:58,884 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:49:58,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:49:58,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,964 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:49:58,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:49:58,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:58,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-20 23:49:59,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:59,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:49:59,415 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:49:59,443 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-20 23:49:59,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 15 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 19 case distinctions, treesize of input 281 treesize of output 263 [2021-11-20 23:50:00,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:00,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:50:00,072 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:00,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:00,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:00,095 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:50:00,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 70 [2021-11-20 23:50:00,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:00,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:50:00,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:50:00,722 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:50:00,894 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:02,668 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:02,668 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-20 23:50:02,669 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 24] total 42 [2021-11-20 23:50:02,669 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459331940] [2021-11-20 23:50:02,669 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:02,669 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:50:02,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:02,670 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:50:02,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=3880, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:50:02,672 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 42 states, 32 states have (on average 1.15625) internal successors, (37), 34 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-20 23:50:04,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:04,700 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-20 23:50:04,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:50:04,702 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 32 states have (on average 1.15625) internal successors, (37), 34 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 27 [2021-11-20 23:50:04,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:04,705 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:50:04,705 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 23:50:04,707 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1937 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=377, Invalid=4879, Unknown=0, NotChecked=0, Total=5256 [2021-11-20 23:50:04,708 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 42 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 418 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:04,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 79 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 418 Invalid, 0 Unknown, 141 Unchecked, 0.6s Time] [2021-11-20 23:50:04,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 23:50:04,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-11-20 23:50:04,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 22 states have internal predecessors, (26), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-20 23:50:04,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 40 transitions. [2021-11-20 23:50:04,721 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 40 transitions. Word has length 27 [2021-11-20 23:50:04,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:04,721 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 40 transitions. [2021-11-20 23:50:04,722 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 32 states have (on average 1.15625) internal successors, (37), 34 states have internal predecessors, (37), 5 states have call successors, (6), 3 states have call predecessors, (6), 5 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-20 23:50:04,722 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 40 transitions. [2021-11-20 23:50:04,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:50:04,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:04,723 INFO L514 BasicCegarLoop]: trace histogram [6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:04,760 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:04,938 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:04,938 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:04,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:04,939 INFO L85 PathProgramCache]: Analyzing trace with hash -98930350, now seen corresponding path program 3 times [2021-11-20 23:50:04,939 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:04,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753490863] [2021-11-20 23:50:04,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:04,939 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:05,009 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 2 proven. 24 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-20 23:50:05,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:05,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753490863] [2021-11-20 23:50:05,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753490863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:05,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849540119] [2021-11-20 23:50:05,012 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:50:05,012 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:05,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:05,016 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:05,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:50:05,103 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:50:05,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:05,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:50:05,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:05,194 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 26 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-20 23:50:05,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:05,280 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 3 proven. 23 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-20 23:50:05,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849540119] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:05,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1528856303] [2021-11-20 23:50:05,282 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:50:05,282 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:05,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:05,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:05,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:05,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,351 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:05,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:05,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-20 23:50:05,884 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:05,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:05,890 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:05,926 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-20 23:50:05,926 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 15 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 19 case distinctions, treesize of input 287 treesize of output 269 [2021-11-20 23:50:06,620 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:50:06,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,701 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:50:06,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 70 [2021-11-20 23:50:06,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:06,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:50:06,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:50:07,418 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:50:07,611 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:08,541 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:08,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:08,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2021-11-20 23:50:08,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666815388] [2021-11-20 23:50:08,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:08,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:50:08,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:08,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:50:08,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=524, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:50:08,543 INFO L87 Difference]: Start difference. First operand 30 states and 40 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:50:08,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:08,663 INFO L93 Difference]: Finished difference Result 61 states and 75 transitions. [2021-11-20 23:50:08,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:50:08,663 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2021-11-20 23:50:08,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:08,664 INFO L225 Difference]: With dead ends: 61 [2021-11-20 23:50:08,664 INFO L226 Difference]: Without dead ends: 48 [2021-11-20 23:50:08,665 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=101, Invalid=711, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:50:08,666 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:08,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 77 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:50:08,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-11-20 23:50:08,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-11-20 23:50:08,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 30 states have internal predecessors, (35), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-11-20 23:50:08,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-11-20 23:50:08,678 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 28 [2021-11-20 23:50:08,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:08,678 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-11-20 23:50:08,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:50:08,679 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-11-20 23:50:08,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:50:08,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:08,680 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:08,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:08,896 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:08,896 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:08,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:08,896 INFO L85 PathProgramCache]: Analyzing trace with hash 1934707082, now seen corresponding path program 4 times [2021-11-20 23:50:08,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:08,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629241500] [2021-11-20 23:50:08,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:08,897 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:08,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:08,981 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 16 proven. 28 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:50:08,982 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:08,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629241500] [2021-11-20 23:50:08,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629241500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:08,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708996286] [2021-11-20 23:50:08,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:50:08,982 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:08,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:08,983 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:09,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:50:09,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:09,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:50:09,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:09,166 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:50:09,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:09,329 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 19 proven. 26 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-20 23:50:09,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708996286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:09,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077240928] [2021-11-20 23:50:09,332 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:50:09,333 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:09,333 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:09,333 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:09,333 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:09,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:09,422 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:09,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:09,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:09,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-20 23:50:09,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:09,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:50:10,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:10,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:50:10,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:10,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:10,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:10,263 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:50:10,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 83 [2021-11-20 23:50:10,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:10,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:50:10,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:50:10,877 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:50:11,026 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:11,570 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:11,570 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:11,570 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 10] total 16 [2021-11-20 23:50:11,571 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782236465] [2021-11-20 23:50:11,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:11,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:50:11,571 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:11,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:50:11,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:50:11,573 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:50:11,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:11,817 INFO L93 Difference]: Finished difference Result 53 states and 65 transitions. [2021-11-20 23:50:11,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:50:11,818 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 28 [2021-11-20 23:50:11,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:11,818 INFO L225 Difference]: With dead ends: 53 [2021-11-20 23:50:11,819 INFO L226 Difference]: Without dead ends: 23 [2021-11-20 23:50:11,820 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=187, Invalid=1219, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:50:11,821 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 14 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:11,821 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 128 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:50:11,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-20 23:50:11,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 19. [2021-11-20 23:50:11,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:50:11,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2021-11-20 23:50:11,826 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 28 [2021-11-20 23:50:11,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:11,827 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2021-11-20 23:50:11,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-20 23:50:11,827 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2021-11-20 23:50:11,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 23:50:11,828 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:11,828 INFO L514 BasicCegarLoop]: trace histogram [9, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:11,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:12,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:12,044 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:12,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:12,045 INFO L85 PathProgramCache]: Analyzing trace with hash -736640206, now seen corresponding path program 5 times [2021-11-20 23:50:12,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:12,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551255000] [2021-11-20 23:50:12,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:12,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:12,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:12,105 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 1 proven. 40 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-20 23:50:12,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:12,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551255000] [2021-11-20 23:50:12,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [551255000] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:12,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845217281] [2021-11-20 23:50:12,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:50:12,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:12,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:12,107 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:12,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:50:12,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:50:12,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:12,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-20 23:50:12,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:12,269 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 42 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:50:12,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:12,413 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 40 proven. 1 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-20 23:50:12,413 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845217281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:50:12,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [146589734] [2021-11-20 23:50:12,418 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:50:12,418 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:50:12,418 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:50:12,418 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:50:12,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:50:12,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:12,512 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-20 23:50:12,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-20 23:50:12,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:12,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:12,560 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:50:12,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:50:13,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,066 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:13,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,075 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:13,108 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-20 23:50:13,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 16 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 19 case distinctions, treesize of input 281 treesize of output 263 [2021-11-20 23:50:13,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:50:13,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 27 [2021-11-20 23:50:13,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,845 INFO L354 Elim1Store]: treesize reduction 57, result has 5.0 percent of original size [2021-11-20 23:50:13,845 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 3 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:50:13,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:13,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:50:13,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:50:14,466 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:50:14,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:50:15,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:50:15,988 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:50:15,988 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 17 [2021-11-20 23:50:15,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057997705] [2021-11-20 23:50:15,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:50:15,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:50:15,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:50:15,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:50:15,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=759, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:50:15,994 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 23:50:16,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:50:16,098 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2021-11-20 23:50:16,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:50:16,099 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 30 [2021-11-20 23:50:16,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:50:16,100 INFO L225 Difference]: With dead ends: 35 [2021-11-20 23:50:16,100 INFO L226 Difference]: Without dead ends: 24 [2021-11-20 23:50:16,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=143, Invalid=979, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:50:16,101 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 13 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:50:16,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 76 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:50:16,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-20 23:50:16,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 20. [2021-11-20 23:50:16,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:50:16,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-20 23:50:16,107 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 30 [2021-11-20 23:50:16,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:50:16,107 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-20 23:50:16,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-20 23:50:16,108 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-20 23:50:16,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-11-20 23:50:16,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:50:16,109 INFO L514 BasicCegarLoop]: trace histogram [9, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:50:16,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:50:16,320 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:50:16,320 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:50:16,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:50:16,321 INFO L85 PathProgramCache]: Analyzing trace with hash -81417082, now seen corresponding path program 6 times [2021-11-20 23:50:16,321 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:50:16,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903508111] [2021-11-20 23:50:16,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:50:16,321 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:50:16,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:50:24,355 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 8 proven. 61 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:50:24,355 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:50:24,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903508111] [2021-11-20 23:50:24,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903508111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:50:24,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75657355] [2021-11-20 23:50:24,355 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:50:24,355 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:50:24,355 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:50:24,356 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:50:24,357 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:50:24,685 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:50:24,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:50:24,687 WARN L261 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-20 23:50:24,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:50:25,715 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:25,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:25,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:25,720 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:50:25,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 225 treesize of output 156 [2021-11-20 23:50:27,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,473 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,489 INFO L354 Elim1Store]: treesize reduction 47, result has 21.7 percent of original size [2021-11-20 23:50:27,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 440 treesize of output 318 [2021-11-20 23:50:27,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:27,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:28,060 INFO L354 Elim1Store]: treesize reduction 308, result has 21.0 percent of original size [2021-11-20 23:50:28,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 20 case distinctions, treesize of input 439 treesize of output 378 [2021-11-20 23:50:30,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:30,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:30,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:50:30,772 INFO L354 Elim1Store]: treesize reduction 410, result has 8.7 percent of original size [2021-11-20 23:50:30,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 3 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 587 treesize of output 450 [2021-11-20 23:50:33,580 INFO L354 Elim1Store]: treesize reduction 34, result has 8.1 percent of original size [2021-11-20 23:50:33,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 605 treesize of output 396 [2021-11-20 23:50:34,615 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 65 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:50:34,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:50:56,994 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 552 treesize of output 486 [2021-11-20 23:50:57,021 INFO L354 Elim1Store]: treesize reduction 32, result has 3.0 percent of original size [2021-11-20 23:50:57,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 744 treesize of output 1 [2021-11-20 23:51:00,745 INFO L354 Elim1Store]: treesize reduction 93, result has 60.9 percent of original size [2021-11-20 23:51:00,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 1439 treesize of output 1113 [2021-11-20 23:51:38,450 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 7 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:51:38,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75657355] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:51:38,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1535427177] [2021-11-20 23:51:38,465 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:51:38,465 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:51:38,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:51:38,466 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:51:38,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:51:38,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:38,567 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-20 23:51:38,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-20 23:51:38,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:38,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:38,602 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:51:38,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:51:39,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:51:39,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:51:39,085 INFO L354 Elim1Store]: treesize reduction 72, result has 23.4 percent of original size [2021-11-20 23:51:39,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 10 select indices, 10 select index equivalence classes, 15 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 19 case distinctions, treesize of input 287 treesize of output 269 [2021-11-20 23:51:39,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:51:39,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,700 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:51:39,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 57 treesize of output 65 [2021-11-20 23:51:39,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:51:39,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:51:39,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:51:40,386 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:51:40,557 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:51:42,953 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:51:42,953 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:51:42,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 25] total 66 [2021-11-20 23:51:42,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336954815] [2021-11-20 23:51:42,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:51:42,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 23:51:42,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:51:42,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 23:51:42,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=5815, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:51:42,957 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 66 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 56 states have internal predecessors, (63), 8 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-20 23:52:13,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:52:13,333 INFO L93 Difference]: Finished difference Result 70 states and 85 transitions. [2021-11-20 23:52:13,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-11-20 23:52:13,334 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 56 states have internal predecessors, (63), 8 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) Word has length 31 [2021-11-20 23:52:13,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:52:13,335 INFO L225 Difference]: With dead ends: 70 [2021-11-20 23:52:13,335 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:52:13,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 36 SyntacticMatches, 10 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3638 ImplicationChecksByTransitivity, 42.5s TimeCoverageRelationStatistics Valid=706, Invalid=9394, Unknown=0, NotChecked=0, Total=10100 [2021-11-20 23:52:13,340 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 119 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 1063 mSolverCounterSat, 142 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 1246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 142 IncrementalHoareTripleChecker+Valid, 1063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:52:13,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [125 Valid, 178 Invalid, 1246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [142 Valid, 1063 Invalid, 0 Unknown, 41 Unchecked, 2.3s Time] [2021-11-20 23:52:13,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:52:13,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 33. [2021-11-20 23:52:13,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-20 23:52:13,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2021-11-20 23:52:13,353 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 31 [2021-11-20 23:52:13,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:52:13,353 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2021-11-20 23:52:13,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 56 states have internal predecessors, (63), 8 states have call successors, (8), 2 states have call predecessors, (8), 8 states have return successors, (9), 9 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-20 23:52:13,354 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2021-11-20 23:52:13,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:52:13,355 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:52:13,355 INFO L514 BasicCegarLoop]: trace histogram [9, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:52:13,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:52:13,576 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:52:13,576 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:52:13,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:52:13,577 INFO L85 PathProgramCache]: Analyzing trace with hash 1359860230, now seen corresponding path program 7 times [2021-11-20 23:52:13,577 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:52:13,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261881342] [2021-11-20 23:52:13,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:52:13,577 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:52:13,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:52:13,673 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 7 proven. 43 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-20 23:52:13,673 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:52:13,673 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261881342] [2021-11-20 23:52:13,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261881342] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:52:13,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534858726] [2021-11-20 23:52:13,674 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:52:13,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:52:13,674 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:52:13,675 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:52:13,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:52:13,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:52:13,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:52:13,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:52:13,872 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 46 proven. 22 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-20 23:52:13,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:52:13,979 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 9 proven. 40 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-20 23:52:13,979 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534858726] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:52:13,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1420989248] [2021-11-20 23:52:13,981 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:52:13,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:52:13,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:52:13,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:52:13,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:52:14,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,064 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-20 23:52:14,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-20 23:52:14,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,110 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:52:14,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:52:14,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:52:14,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:52:14,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,802 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:52:14,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 88 [2021-11-20 23:52:14,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:14,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:52:14,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:52:15,385 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:52:15,555 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:52:16,193 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:52:16,194 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:52:16,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 16 [2021-11-20 23:52:16,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151489159] [2021-11-20 23:52:16,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:52:16,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:52:16,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:52:16,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:52:16,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=714, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:52:16,196 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:52:16,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:52:16,363 INFO L93 Difference]: Finished difference Result 62 states and 74 transitions. [2021-11-20 23:52:16,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:52:16,363 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 33 [2021-11-20 23:52:16,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:52:16,364 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:52:16,364 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:52:16,365 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=134, Invalid=988, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:52:16,366 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 11 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:52:16,366 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 91 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:52:16,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:52:16,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2021-11-20 23:52:16,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-20 23:52:16,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-20 23:52:16,376 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 33 [2021-11-20 23:52:16,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:52:16,376 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-20 23:52:16,376 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:52:16,376 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-20 23:52:16,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:52:16,377 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:52:16,378 INFO L514 BasicCegarLoop]: trace histogram [11, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:52:16,406 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:52:16,588 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:52:16,589 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:52:16,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:52:16,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1592869130, now seen corresponding path program 8 times [2021-11-20 23:52:16,589 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:52:16,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808515564] [2021-11-20 23:52:16,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:52:16,590 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:52:16,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:52:16,673 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 24 proven. 59 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-20 23:52:16,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:52:16,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808515564] [2021-11-20 23:52:16,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808515564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:52:16,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739884614] [2021-11-20 23:52:16,697 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:52:16,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:52:16,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:52:16,713 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:52:16,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:52:16,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:52:16,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:52:16,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:52:16,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:52:16,917 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 47 proven. 9 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-20 23:52:16,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:52:17,060 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 45 proven. 9 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-20 23:52:17,060 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739884614] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:52:17,060 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [218046252] [2021-11-20 23:52:17,062 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:52:17,063 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:52:17,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:52:17,063 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:52:17,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:52:17,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,128 INFO L354 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2021-11-20 23:52:17,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 28 [2021-11-20 23:52:17,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,169 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:52:17,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:52:17,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:52:17,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:52:17,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,792 INFO L354 Elim1Store]: treesize reduction 65, result has 27.0 percent of original size [2021-11-20 23:52:17,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 83 [2021-11-20 23:52:17,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:17,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:52:17,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:52:18,379 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:52:18,538 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:52:19,162 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:52:19,162 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:52:19,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 22 [2021-11-20 23:52:19,163 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693593122] [2021-11-20 23:52:19,163 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:52:19,163 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:52:19,163 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:52:19,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:52:19,164 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:52:19,165 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:52:19,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:52:19,395 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2021-11-20 23:52:19,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:52:19,395 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 34 [2021-11-20 23:52:19,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:52:19,396 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:52:19,396 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:52:19,397 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 675 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=255, Invalid=1907, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:52:19,397 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:52:19,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 95 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:52:19,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:52:19,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2021-11-20 23:52:19,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:52:19,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-11-20 23:52:19,405 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 34 [2021-11-20 23:52:19,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:52:19,406 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-11-20 23:52:19,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-20 23:52:19,406 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-11-20 23:52:19,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:52:19,407 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:52:19,407 INFO L514 BasicCegarLoop]: trace histogram [12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:52:19,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-20 23:52:19,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:52:19,612 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:52:19,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:52:19,613 INFO L85 PathProgramCache]: Analyzing trace with hash 211120082, now seen corresponding path program 9 times [2021-11-20 23:52:19,613 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:52:19,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723821412] [2021-11-20 23:52:19,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:52:19,613 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:52:19,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:52:19,687 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 3 proven. 62 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-20 23:52:19,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:52:19,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723821412] [2021-11-20 23:52:19,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723821412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:52:19,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900090073] [2021-11-20 23:52:19,688 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:52:19,689 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:52:19,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:52:19,695 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:52:19,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:52:19,864 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:52:19,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:52:19,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:52:19,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:52:19,987 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 61 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-20 23:52:19,987 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:52:20,099 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 6 proven. 59 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-20 23:52:20,100 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900090073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:52:20,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [111377753] [2021-11-20 23:52:20,102 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:52:20,102 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:52:20,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:52:20,102 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:52:20,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:52:20,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,196 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-20 23:52:20,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-20 23:52:20,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 24 [2021-11-20 23:52:20,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 20 [2021-11-20 23:52:20,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 20 [2021-11-20 23:52:20,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:20,974 INFO L354 Elim1Store]: treesize reduction 60, result has 32.6 percent of original size [2021-11-20 23:52:20,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 75 treesize of output 88 [2021-11-20 23:52:21,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:52:21,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 24 [2021-11-20 23:52:21,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-20 23:52:21,532 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 20 for LOIs [2021-11-20 23:52:21,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:52:22,319 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:52:22,319 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:52:22,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 15 [2021-11-20 23:52:22,319 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890415064] [2021-11-20 23:52:22,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:52:22,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 23:52:22,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:52:22,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 23:52:22,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:52:22,321 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:52:22,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:52:22,422 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2021-11-20 23:52:22,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:52:22,423 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2021-11-20 23:52:22,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:52:22,423 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:52:22,423 INFO L226 Difference]: Without dead ends: 27 [2021-11-20 23:52:22,424 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=121, Invalid=871, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:52:22,424 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:52:22,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 61 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:52:22,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-20 23:52:22,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 22. [2021-11-20 23:52:22,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-20 23:52:22,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2021-11-20 23:52:22,432 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 34 [2021-11-20 23:52:22,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:52:22,433 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2021-11-20 23:52:22,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-20 23:52:22,433 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2021-11-20 23:52:22,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:52:22,434 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:52:22,434 INFO L514 BasicCegarLoop]: trace histogram [12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:52:22,459 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:52:22,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:52:22,651 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:52:22,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:52:22,652 INFO L85 PathProgramCache]: Analyzing trace with hash 2032146550, now seen corresponding path program 10 times [2021-11-20 23:52:22,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:52:22,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574422984] [2021-11-20 23:52:22,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:52:22,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:52:22,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:55:42,880 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 13 proven. 98 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:55:42,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:55:42,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574422984] [2021-11-20 23:55:42,881 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574422984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:55:42,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455305298] [2021-11-20 23:55:42,881 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:55:42,881 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:55:42,881 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:55:42,883 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:55:42,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c6ae2233-e721-4eac-990f-fb7400ab0a83/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:55:43,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:55:43,341 WARN L261 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-20 23:55:43,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:55:45,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:45,294 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:55:45,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 459 treesize of output 303 [2021-11-20 23:55:49,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:49,388 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:55:49,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 897 treesize of output 574 [2021-11-20 23:55:50,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:55:50,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:50,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:55:50,405 INFO L354 Elim1Store]: treesize reduction 2, result has 33.3 percent of original size [2021-11-20 23:55:50,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 838 treesize of output 597 [2021-11-20 23:55:51,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:51,377 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:55:51,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 835 treesize of output 574 [2021-11-20 23:55:52,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:55:52,343 INFO L354 Elim1Store]: treesize reduction 131, result has 16.6 percent of original size [2021-11-20 23:55:52,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 838 treesize of output 583 [2021-11-20 23:55:56,299 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-11-20 23:55:56,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 1219 treesize of output 814 [2021-11-20 23:55:58,420 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 5 proven. 106 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:55:58,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:58:34,624 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 7137 treesize of output 5663 [2021-11-20 23:58:36,878 INFO L354 Elim1Store]: treesize reduction 66, result has 1.5 percent of original size [2021-11-20 23:58:36,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 38053272533 treesize of output 1 [2021-11-21 00:01:53,483 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 00:01:53,484 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 57557 treesize of output 45485