./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/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_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1dc3813f801c08c10697b6f3aeaa3afb846521f0bb73d940036cc656d8340c66 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:35:46,531 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:35:46,533 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:35:46,578 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:35:46,579 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:35:46,585 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:35:46,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:35:46,592 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:35:46,595 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:35:46,604 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:35:46,605 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:35:46,607 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:35:46,608 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:35:46,611 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:35:46,614 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:35:46,623 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:35:46,624 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:35:46,626 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:35:46,628 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:35:46,637 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:35:46,639 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:35:46,641 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:35:46,644 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:35:46,645 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:35:46,649 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:35:46,650 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:35:46,650 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:35:46,653 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:35:46,654 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:35:46,655 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:35:46,657 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:35:46,658 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:35:46,660 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:35:46,662 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:35:46,663 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:35:46,664 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:35:46,665 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:35:46,665 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:35:46,665 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:35:46,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:35:46,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:35:46,668 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-20 23:35:46,719 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:35:46,724 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:35:46,725 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:35:46,725 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:35:46,726 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:35:46,726 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:35:46,727 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:35:46,727 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:35:46,727 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:35:46,727 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:35:46,729 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:35:46,729 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:35:46,729 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:35:46,729 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:35:46,730 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:35:46,730 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:35:46,730 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:35:46,731 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:35:46,731 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 23:35:46,732 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 23:35:46,732 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:35:46,732 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:35:46,732 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-20 23:35:46,734 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:35:46,734 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:35:46,735 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:35:46,735 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-20 23:35:46,735 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-20 23:35:46,735 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-20 23:35:46,736 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:35:46,736 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-20 23:35:46,736 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:35:46,737 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:35:46,737 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:35:46,737 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:35:46,737 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:46,738 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:35:46,738 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:35:46,738 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:35:46,738 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:35:46,739 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:35:46,739 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:35:46,739 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_d2e494d6-99de-4eb2-82cd-83915e05d555/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1dc3813f801c08c10697b6f3aeaa3afb846521f0bb73d940036cc656d8340c66 [2021-11-20 23:35:47,002 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:35:47,037 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:35:47,040 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:35:47,041 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:35:47,042 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:35:47,044 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i [2021-11-20 23:35:47,131 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/data/a2618138a/740d63adbf50448782e588bfc7ef5842/FLAGcdc7aa7ce [2021-11-20 23:35:47,644 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:35:47,644 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i [2021-11-20 23:35:47,657 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/data/a2618138a/740d63adbf50448782e588bfc7ef5842/FLAGcdc7aa7ce [2021-11-20 23:35:48,107 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/data/a2618138a/740d63adbf50448782e588bfc7ef5842 [2021-11-20 23:35:48,110 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:35:48,111 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:35:48,113 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:48,113 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:35:48,118 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:35:48,119 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,120 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@789f0948 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48, skipping insertion in model container [2021-11-20 23:35:48,121 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,129 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:35:48,145 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:35:48,329 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_d2e494d6-99de-4eb2-82cd-83915e05d555/sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i[817,830] [2021-11-20 23:35:48,350 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:48,356 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:35:48,367 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_d2e494d6-99de-4eb2-82cd-83915e05d555/sv-benchmarks/c/array-examples/standard_strcpy_ground-2.i[817,830] [2021-11-20 23:35:48,380 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:48,394 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:35:48,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48 WrapperNode [2021-11-20 23:35:48,394 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:48,395 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:48,395 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:35:48,395 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:35:48,402 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,424 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,453 INFO L137 Inliner]: procedures = 16, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 64 [2021-11-20 23:35:48,454 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:48,455 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:35:48,455 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:35:48,455 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:35:48,464 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,465 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,469 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,470 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,489 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,493 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,495 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,496 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:35:48,497 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:35:48,498 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:35:48,498 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:35:48,499 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (1/1) ... [2021-11-20 23:35:48,507 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:48,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:48,528 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:35:48,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:35:48,564 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:35:48,565 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:35:48,565 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:35:48,565 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:35:48,565 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:35:48,565 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:35:48,565 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:35:48,566 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:35:48,635 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:35:48,637 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:35:48,890 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:35:48,937 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:35:48,938 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:35:48,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:48 BoogieIcfgContainer [2021-11-20 23:35:48,941 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:35:48,942 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:35:48,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:35:48,946 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:35:48,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:35:48" (1/3) ... [2021-11-20 23:35:48,947 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1acb643d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:48, skipping insertion in model container [2021-11-20 23:35:48,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:48" (2/3) ... [2021-11-20 23:35:48,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1acb643d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:48, skipping insertion in model container [2021-11-20 23:35:48,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:48" (3/3) ... [2021-11-20 23:35:48,950 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_strcpy_ground-2.i [2021-11-20 23:35:48,955 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:35:48,955 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 14 error locations. [2021-11-20 23:35:49,000 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:35:49,024 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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 23:35:49,024 INFO L340 AbstractCegarLoop]: Starting to check reachability of 14 error locations. [2021-11-20 23:35:49,056 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:35:49,065 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:49,065 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:35:49,066 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:49,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:49,080 INFO L85 PathProgramCache]: Analyzing trace with hash 113238, now seen corresponding path program 1 times [2021-11-20 23:35:49,090 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:49,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443717518] [2021-11-20 23:35:49,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:49,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:49,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:49,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:49,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:49,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443717518] [2021-11-20 23:35:49,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443717518] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:49,303 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:49,304 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:35:49,306 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987413274] [2021-11-20 23:35:49,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:49,312 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:49,312 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:49,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:49,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,353 INFO L87 Difference]: Start difference. First operand has 30 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:49,462 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-11-20 23:35:49,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:49,467 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-20 23:35:49,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:49,483 INFO L225 Difference]: With dead ends: 59 [2021-11-20 23:35:49,484 INFO L226 Difference]: Without dead ends: 57 [2021-11-20 23:35:49,486 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,490 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 28 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:49,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 32 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:49,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-11-20 23:35:49,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 30. [2021-11-20 23:35:49,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 2.0) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-11-20 23:35:49,532 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 3 [2021-11-20 23:35:49,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:49,533 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-11-20 23:35:49,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,534 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-11-20 23:35:49,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:35:49,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:49,535 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:35:49,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:35:49,536 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:49,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:49,541 INFO L85 PathProgramCache]: Analyzing trace with hash 110837, now seen corresponding path program 1 times [2021-11-20 23:35:49,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:49,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562233427] [2021-11-20 23:35:49,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:49,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:49,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:49,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:49,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:49,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562233427] [2021-11-20 23:35:49,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562233427] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:49,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:49,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:35:49,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1392608779] [2021-11-20 23:35:49,631 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:49,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:49,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:49,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:49,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,633 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:49,683 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-20 23:35:49,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:49,684 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-20 23:35:49,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:49,686 INFO L225 Difference]: With dead ends: 26 [2021-11-20 23:35:49,686 INFO L226 Difference]: Without dead ends: 26 [2021-11-20 23:35:49,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,691 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 23 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:49,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:49,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-20 23:35:49,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-20 23:35:49,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.75) internal successors, (28), 25 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-11-20 23:35:49,696 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 3 [2021-11-20 23:35:49,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:49,696 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-11-20 23:35:49,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,696 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-11-20 23:35:49,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:35:49,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:49,697 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:35:49,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:35:49,698 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:49,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:49,698 INFO L85 PathProgramCache]: Analyzing trace with hash 110838, now seen corresponding path program 1 times [2021-11-20 23:35:49,698 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:49,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913553927] [2021-11-20 23:35:49,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:49,699 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:49,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:49,805 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:49,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:49,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913553927] [2021-11-20 23:35:49,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [913553927] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:49,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:49,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:35:49,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833652804] [2021-11-20 23:35:49,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:49,808 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:49,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:49,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:49,809 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,809 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:49,862 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2021-11-20 23:35:49,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:49,864 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2021-11-20 23:35:49,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:49,865 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:35:49,866 INFO L226 Difference]: Without dead ends: 27 [2021-11-20 23:35:49,866 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:49,874 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:49,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:49,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-20 23:35:49,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-20 23:35:49,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 26 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-11-20 23:35:49,886 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 3 [2021-11-20 23:35:49,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:49,886 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-11-20 23:35:49,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:49,887 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-11-20 23:35:49,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:35:49,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:49,887 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:35:49,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:35:49,888 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:49,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:49,889 INFO L85 PathProgramCache]: Analyzing trace with hash 106585312, now seen corresponding path program 1 times [2021-11-20 23:35:49,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:49,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808580739] [2021-11-20 23:35:49,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:49,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:49,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:49,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:49,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808580739] [2021-11-20 23:35:49,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808580739] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:49,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554425571] [2021-11-20 23:35:49,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:49,949 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:49,949 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:49,957 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:49,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:35:50,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:50,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:35:50,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:50,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:50,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:50,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:50,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554425571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:50,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [753434842] [2021-11-20 23:35:50,151 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 23:35:50,152 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:50,156 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:50,162 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:50,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:50,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:35:50,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:50,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:35:51,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,031 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:35:51,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2021-11-20 23:35:51,694 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 25 treesize of output 21 [2021-11-20 23:35:51,806 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 25 treesize of output 21 [2021-11-20 23:35:52,013 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:52,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [753434842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:52,311 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:52,312 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 9 [2021-11-20 23:35:52,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905761894] [2021-11-20 23:35:52,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:52,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:35:52,313 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:52,313 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:35:52,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:35:52,314 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:52,585 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-11-20 23:35:52,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:35:52,586 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-20 23:35:52,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:52,587 INFO L225 Difference]: With dead ends: 28 [2021-11-20 23:35:52,587 INFO L226 Difference]: Without dead ends: 28 [2021-11-20 23:35:52,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:52,588 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 3 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:52,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 36 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 20 Unchecked, 0.1s Time] [2021-11-20 23:35:52,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-20 23:35:52,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-20 23:35:52,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.6666666666666667) internal successors, (30), 27 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-20 23:35:52,601 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 5 [2021-11-20 23:35:52,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:52,602 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-20 23:35:52,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:52,604 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-20 23:35:52,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:35:52,604 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:52,604 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-20 23:35:52,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:52,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:52,817 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:52,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:52,818 INFO L85 PathProgramCache]: Analyzing trace with hash 106582911, now seen corresponding path program 1 times [2021-11-20 23:35:52,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:52,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572800302] [2021-11-20 23:35:52,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:52,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:52,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:52,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:52,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:52,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572800302] [2021-11-20 23:35:52,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572800302] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:52,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844187285] [2021-11-20 23:35:52,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:52,898 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:52,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:52,899 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:52,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:35:52,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:52,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:35:52,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:52,968 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:35:52,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:35:53,012 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:53,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:53,056 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:53,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844187285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:53,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [603107387] [2021-11-20 23:35:53,059 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-20 23:35:53,059 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:53,059 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:53,059 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:53,059 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:53,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:35:53,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:53,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:53,561 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:53,586 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:53,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:35:54,383 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 25 treesize of output 21 [2021-11-20 23:35:54,510 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 25 treesize of output 21 [2021-11-20 23:35:54,550 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:54,806 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:54,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:54,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [2, 2, 2] total 4 [2021-11-20 23:35:54,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913888457] [2021-11-20 23:35:54,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:54,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:35:54,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:54,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:35:54,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-20 23:35:54,808 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:54,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:54,917 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-11-20 23:35:54,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:35:54,918 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-20 23:35:54,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:54,919 INFO L225 Difference]: With dead ends: 33 [2021-11-20 23:35:54,919 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:35:54,920 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:35:54,921 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:54,921 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 39 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:54,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:35:54,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-20 23:35:54,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 32 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:54,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-11-20 23:35:54,930 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 5 [2021-11-20 23:35:54,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:54,930 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-11-20 23:35:54,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.0) internal successors, (10), 5 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:54,931 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-11-20 23:35:54,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:35:54,932 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:54,932 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:54,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:55,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,159 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:55,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:55,159 INFO L85 PathProgramCache]: Analyzing trace with hash -652077635, now seen corresponding path program 1 times [2021-11-20 23:35:55,159 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:55,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107164587] [2021-11-20 23:35:55,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:55,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,197 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:35:55,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107164587] [2021-11-20 23:35:55,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107164587] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:55,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:55,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:35:55,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234239525] [2021-11-20 23:35:55,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:55,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:55,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:55,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:55,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:55,200 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:55,218 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-20 23:35:55,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:55,218 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:35:55,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:55,219 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:35:55,219 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:35:55,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:55,220 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:55,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:55,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:35:55,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-20 23:35:55,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-20 23:35:55,225 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 10 [2021-11-20 23:35:55,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:55,225 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-20 23:35:55,225 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:55,225 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-20 23:35:55,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:35:55,226 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:55,226 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:55,226 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:35:55,227 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:55,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:55,227 INFO L85 PathProgramCache]: Analyzing trace with hash -652077634, now seen corresponding path program 1 times [2021-11-20 23:35:55,227 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:55,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047835386] [2021-11-20 23:35:55,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,228 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:55,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047835386] [2021-11-20 23:35:55,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1047835386] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:55,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279131481] [2021-11-20 23:35:55,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:55,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:55,265 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:55,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:35:55,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:35:55,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:55,341 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:55,383 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:55,383 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279131481] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:55,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327386675] [2021-11-20 23:35:55,386 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:55,386 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:55,386 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:55,387 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:55,387 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:55,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:35:55,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:55,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:55,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:55,815 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:55,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:35:56,630 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 25 treesize of output 21 [2021-11-20 23:35:56,756 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 25 treesize of output 21 [2021-11-20 23:35:57,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:57,737 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:57,737 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:57,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2021-11-20 23:35:57,737 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433666907] [2021-11-20 23:35:57,737 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:57,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:35:57,738 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:57,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:35:57,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-11-20 23:35:57,739 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:57,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:57,874 INFO L93 Difference]: Finished difference Result 141 states and 149 transitions. [2021-11-20 23:35:57,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:35:57,875 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:35:57,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:57,876 INFO L225 Difference]: With dead ends: 141 [2021-11-20 23:35:57,876 INFO L226 Difference]: Without dead ends: 141 [2021-11-20 23:35:57,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=92, Invalid=148, Unknown=0, NotChecked=0, Total=240 [2021-11-20 23:35:57,878 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 263 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:57,878 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [263 Valid, 80 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:57,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-20 23:35:57,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 34. [2021-11-20 23:35:57,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 33 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:57,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-11-20 23:35:57,885 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 10 [2021-11-20 23:35:57,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:57,885 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-11-20 23:35:57,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:57,886 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-11-20 23:35:57,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:35:57,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:57,886 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1] [2021-11-20 23:35:57,919 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 23:35:58,108 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:58,108 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:58,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:58,108 INFO L85 PathProgramCache]: Analyzing trace with hash -891058790, now seen corresponding path program 2 times [2021-11-20 23:35:58,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:58,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784346055] [2021-11-20 23:35:58,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:58,109 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:58,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:58,229 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:58,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:58,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784346055] [2021-11-20 23:35:58,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784346055] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:58,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942337215] [2021-11-20 23:35:58,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:58,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:58,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:58,232 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:58,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:35:58,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:35:58,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:58,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:35:58,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:58,303 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:35:58,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:35:58,418 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:35:58,418 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:35:58,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942337215] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:58,418 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:35:58,419 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 8 [2021-11-20 23:35:58,419 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562531715] [2021-11-20 23:35:58,419 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:58,419 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:35:58,420 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:58,420 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:35:58,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:35:58,421 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:58,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:58,457 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2021-11-20 23:35:58,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:35:58,457 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-11-20 23:35:58,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:58,462 INFO L225 Difference]: With dead ends: 33 [2021-11-20 23:35:58,462 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:35:58,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:35:58,464 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 18 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:58,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 17 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:58,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:35:58,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-20 23:35:58,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 32 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:58,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-11-20 23:35:58,475 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 11 [2021-11-20 23:35:58,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:58,475 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-11-20 23:35:58,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:58,475 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-11-20 23:35:58,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:35:58,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:58,476 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:58,505 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:58,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:35:58,694 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:58,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:58,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1149927578, now seen corresponding path program 2 times [2021-11-20 23:35:58,694 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:58,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248576249] [2021-11-20 23:35:58,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:58,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:58,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:58,773 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:58,774 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:58,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248576249] [2021-11-20 23:35:58,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248576249] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:58,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723848006] [2021-11-20 23:35:58,774 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:58,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:58,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:58,788 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:58,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:35:58,825 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-20 23:35:58,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:58,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:35:58,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:58,842 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:35:58,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:35:58,975 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:35:58,976 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:35:58,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723848006] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:58,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:35:58,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [8] total 10 [2021-11-20 23:35:58,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390793725] [2021-11-20 23:35:58,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:58,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:35:58,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:58,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:35:58,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:58,978 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:59,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:59,024 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-11-20 23:35:59,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:35:59,025 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-20 23:35:59,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:59,025 INFO L225 Difference]: With dead ends: 46 [2021-11-20 23:35:59,026 INFO L226 Difference]: Without dead ends: 46 [2021-11-20 23:35:59,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=48, Invalid=62, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:59,029 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 33 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:59,029 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 15 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:59,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-20 23:35:59,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 36. [2021-11-20 23:35:59,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.3) internal successors, (39), 35 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:59,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-11-20 23:35:59,042 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 18 [2021-11-20 23:35:59,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:59,042 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-11-20 23:35:59,043 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:59,043 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-11-20 23:35:59,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:35:59,044 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:59,044 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:59,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:59,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:59,245 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:35:59,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:59,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1288017910, now seen corresponding path program 1 times [2021-11-20 23:35:59,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:59,246 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145054080] [2021-11-20 23:35:59,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:59,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:59,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:59,366 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:59,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:59,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145054080] [2021-11-20 23:35:59,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145054080] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:59,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192314069] [2021-11-20 23:35:59,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:59,366 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:59,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:59,368 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:59,369 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:35:59,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:59,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:35:59,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:59,493 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:59,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:59,608 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:59,608 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192314069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:59,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [617741059] [2021-11-20 23:35:59,610 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:59,611 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:59,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:59,611 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:59,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:59,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:35:59,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:59,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:00,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:00,055 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:00,080 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:00,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:36:00,748 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 25 treesize of output 21 [2021-11-20 23:36:00,870 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 25 treesize of output 21 [2021-11-20 23:36:01,144 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:01,161 INFO L354 Elim1Store]: treesize reduction 88, result has 22.1 percent of original size [2021-11-20 23:36:01,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 61 [2021-11-20 23:36:01,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:01,653 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:01,655 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:01,725 INFO L354 Elim1Store]: treesize reduction 261, result has 12.4 percent of original size [2021-11-20 23:36:01,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 139 [2021-11-20 23:36:02,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:02,110 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:02,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:02,303 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:02,314 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:02,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:02,497 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:02,961 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:02,961 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:02,962 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 16 [2021-11-20 23:36:02,962 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204895223] [2021-11-20 23:36:02,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:02,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:36:02,963 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:02,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:36:02,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:36:02,964 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:03,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:03,275 INFO L93 Difference]: Finished difference Result 298 states and 314 transitions. [2021-11-20 23:36:03,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:36:03,276 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-20 23:36:03,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:03,280 INFO L225 Difference]: With dead ends: 298 [2021-11-20 23:36:03,280 INFO L226 Difference]: Without dead ends: 298 [2021-11-20 23:36:03,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:36:03,281 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 555 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 555 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:03,282 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [555 Valid, 160 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:36:03,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-20 23:36:03,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 52. [2021-11-20 23:36:03,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 51 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:03,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2021-11-20 23:36:03,299 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 19 [2021-11-20 23:36:03,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:03,300 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2021-11-20 23:36:03,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:03,300 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2021-11-20 23:36:03,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:36:03,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:03,302 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:03,346 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:03,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:03,520 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:03,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:03,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1259811522, now seen corresponding path program 2 times [2021-11-20 23:36:03,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:03,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944698014] [2021-11-20 23:36:03,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:03,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:03,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:03,774 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:03,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:03,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944698014] [2021-11-20 23:36:03,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944698014] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:03,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315308096] [2021-11-20 23:36:03,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:03,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:03,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:03,777 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:03,778 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:36:03,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:36:03,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:03,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-20 23:36:03,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:03,997 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-20 23:36:03,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:04,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 23 [2021-11-20 23:36:04,229 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-11-20 23:36:04,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315308096] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:04,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980995276] [2021-11-20 23:36:04,232 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:04,232 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:04,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:04,232 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:04,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:04,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:04,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:04,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:04,640 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:04,663 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:04,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:36:05,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:05,402 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 25 treesize of output 21 [2021-11-20 23:36:05,741 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:05,759 INFO L354 Elim1Store]: treesize reduction 88, result has 22.1 percent of original size [2021-11-20 23:36:05,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 61 [2021-11-20 23:36:06,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,184 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,242 INFO L354 Elim1Store]: treesize reduction 261, result has 12.4 percent of original size [2021-11-20 23:36:06,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 139 [2021-11-20 23:36:06,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,617 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:06,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:06,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,801 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:06,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:06,962 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:07,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:07,575 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:07,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 4, 4] total 24 [2021-11-20 23:36:07,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145790872] [2021-11-20 23:36:07,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:07,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:36:07,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:07,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:36:07,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=679, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:36:07,578 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:08,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:08,798 INFO L93 Difference]: Finished difference Result 316 states and 333 transitions. [2021-11-20 23:36:08,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-20 23:36:08,798 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:36:08,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:08,800 INFO L225 Difference]: With dead ends: 316 [2021-11-20 23:36:08,800 INFO L226 Difference]: Without dead ends: 316 [2021-11-20 23:36:08,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 645 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=858, Invalid=2222, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:36:08,802 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1560 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1560 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 435 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:08,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1560 Valid, 135 Invalid, 435 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:36:08,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2021-11-20 23:36:08,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 63. [2021-11-20 23:36:08,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 57 states have (on average 1.2280701754385965) internal successors, (70), 62 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:08,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 70 transitions. [2021-11-20 23:36:08,809 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 70 transitions. Word has length 35 [2021-11-20 23:36:08,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:08,809 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 70 transitions. [2021-11-20 23:36:08,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:08,810 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 70 transitions. [2021-11-20 23:36:08,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:36:08,811 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:08,811 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:08,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:09,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:09,012 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:09,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:09,013 INFO L85 PathProgramCache]: Analyzing trace with hash 950813964, now seen corresponding path program 1 times [2021-11-20 23:36:09,013 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:09,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152306247] [2021-11-20 23:36:09,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:09,014 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:09,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:09,084 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 23:36:09,084 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:09,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152306247] [2021-11-20 23:36:09,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152306247] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:09,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:09,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:36:09,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387848792] [2021-11-20 23:36:09,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:09,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:09,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:09,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:09,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:09,087 INFO L87 Difference]: Start difference. First operand 63 states and 70 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:09,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:09,111 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2021-11-20 23:36:09,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:09,112 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-20 23:36:09,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:09,113 INFO L225 Difference]: With dead ends: 67 [2021-11-20 23:36:09,113 INFO L226 Difference]: Without dead ends: 67 [2021-11-20 23:36:09,113 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 23:36:09,114 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 8 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:09,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 25 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:09,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-11-20 23:36:09,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2021-11-20 23:36:09,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 59 states have (on average 1.2203389830508475) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:09,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2021-11-20 23:36:09,122 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 37 [2021-11-20 23:36:09,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:09,123 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2021-11-20 23:36:09,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:09,123 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2021-11-20 23:36:09,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-20 23:36:09,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:09,128 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:09,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 23:36:09,129 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:09,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:09,129 INFO L85 PathProgramCache]: Analyzing trace with hash 950815164, now seen corresponding path program 1 times [2021-11-20 23:36:09,129 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:09,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068375074] [2021-11-20 23:36:09,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:09,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:09,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:09,344 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:09,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:09,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068375074] [2021-11-20 23:36:09,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068375074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:09,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012304605] [2021-11-20 23:36:09,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:09,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:09,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:09,349 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:09,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:36:09,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:09,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:36:09,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:09,523 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:09,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:09,960 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:09,961 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012304605] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:09,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1414470418] [2021-11-20 23:36:09,963 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-20 23:36:09,963 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:09,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:09,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:09,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:10,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:10,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:10,393 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:10,395 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:10,422 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:10,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:36:11,047 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 25 treesize of output 21 [2021-11-20 23:36:11,183 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 25 treesize of output 21 [2021-11-20 23:36:11,486 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:36:11,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 86 treesize of output 85 [2021-11-20 23:36:11,710 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:12,392 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:12,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:12,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 34 [2021-11-20 23:36:12,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567578839] [2021-11-20 23:36:12,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:12,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:36:12,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:12,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:36:12,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=814, Invalid=992, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:36:12,395 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand has 35 states, 35 states have (on average 2.057142857142857) internal successors, (72), 34 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:13,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:13,068 INFO L93 Difference]: Finished difference Result 647 states and 680 transitions. [2021-11-20 23:36:13,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:36:13,069 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.057142857142857) internal successors, (72), 34 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-20 23:36:13,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:13,073 INFO L225 Difference]: With dead ends: 647 [2021-11-20 23:36:13,073 INFO L226 Difference]: Without dead ends: 647 [2021-11-20 23:36:13,074 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 545 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=814, Invalid=992, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:36:13,075 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 1612 mSDsluCounter, 396 mSDsCounter, 0 mSdLazyCounter, 373 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1612 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 373 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:13,075 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1612 Valid, 340 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 373 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:36:13,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-11-20 23:36:13,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 99. [2021-11-20 23:36:13,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 93 states have (on average 1.1397849462365592) internal successors, (106), 98 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:13,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2021-11-20 23:36:13,084 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 37 [2021-11-20 23:36:13,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:13,084 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2021-11-20 23:36:13,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.057142857142857) internal successors, (72), 34 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:13,085 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2021-11-20 23:36:13,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-20 23:36:13,086 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:13,086 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:13,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:13,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:36:13,312 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:13,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:13,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1552483179, now seen corresponding path program 2 times [2021-11-20 23:36:13,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:13,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926972041] [2021-11-20 23:36:13,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:13,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:13,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:13,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:13,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:13,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926972041] [2021-11-20 23:36:13,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926972041] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:13,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286295774] [2021-11-20 23:36:13,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:13,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:13,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:13,939 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:13,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:36:13,974 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-20 23:36:13,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:13,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:36:13,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:14,747 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1024 trivial. 0 not checked. [2021-11-20 23:36:14,747 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:36:14,748 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286295774] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:14,748 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:36:14,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [34] total 36 [2021-11-20 23:36:14,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492385880] [2021-11-20 23:36:14,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:14,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:14,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:14,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:14,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=599, Invalid=733, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:36:14,750 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:14,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:14,774 INFO L93 Difference]: Finished difference Result 98 states and 105 transitions. [2021-11-20 23:36:14,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:14,774 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 71 [2021-11-20 23:36:14,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:14,778 INFO L225 Difference]: With dead ends: 98 [2021-11-20 23:36:14,778 INFO L226 Difference]: Without dead ends: 95 [2021-11-20 23:36:14,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=599, Invalid=733, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:36:14,780 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 14 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:14,781 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 16 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 13 Unchecked, 0.0s Time] [2021-11-20 23:36:14,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-11-20 23:36:14,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-11-20 23:36:14,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.1222222222222222) internal successors, (101), 94 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:14,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 101 transitions. [2021-11-20 23:36:14,799 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 101 transitions. Word has length 71 [2021-11-20 23:36:14,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:14,799 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 101 transitions. [2021-11-20 23:36:14,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:14,800 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 101 transitions. [2021-11-20 23:36:14,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-20 23:36:14,805 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:14,805 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1] [2021-11-20 23:36:14,834 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:15,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:36:15,028 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:15,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:15,028 INFO L85 PathProgramCache]: Analyzing trace with hash -338702105, now seen corresponding path program 1 times [2021-11-20 23:36:15,028 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:15,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276587810] [2021-11-20 23:36:15,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:15,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:15,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:36:15,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:15,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276587810] [2021-11-20 23:36:15,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276587810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:15,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128697704] [2021-11-20 23:36:15,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:15,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:15,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:15,659 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:15,679 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:36:15,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:15,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:36:15,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:15,971 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:36:15,971 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:17,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:36:17,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [128697704] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:17,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515579200] [2021-11-20 23:36:17,642 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:17,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:17,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:17,642 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:17,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:17,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:17,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:17,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:17,997 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:18,018 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:18,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:36:18,586 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 25 treesize of output 21 [2021-11-20 23:36:18,681 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 25 treesize of output 21 [2021-11-20 23:36:18,980 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:18,997 INFO L354 Elim1Store]: treesize reduction 68, result has 22.7 percent of original size [2021-11-20 23:36:18,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 51 [2021-11-20 23:36:19,427 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:19,428 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:19,549 INFO L354 Elim1Store]: treesize reduction 307, result has 19.6 percent of original size [2021-11-20 23:36:19,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 165 treesize of output 160 [2021-11-20 23:36:19,931 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:19,942 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:19,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:20,128 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:20,137 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:20,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:20,238 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:20,873 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:20,873 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:20,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 68 [2021-11-20 23:36:20,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135286154] [2021-11-20 23:36:20,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:20,874 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-20 23:36:20,874 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:20,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-20 23:36:20,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2364, Invalid=3186, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:36:20,877 INFO L87 Difference]: Start difference. First operand 95 states and 101 transitions. Second operand has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:23,117 INFO L93 Difference]: Finished difference Result 1191 states and 1258 transitions. [2021-11-20 23:36:23,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-11-20 23:36:23,118 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-20 23:36:23,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:23,124 INFO L225 Difference]: With dead ends: 1191 [2021-11-20 23:36:23,124 INFO L226 Difference]: Without dead ends: 1191 [2021-11-20 23:36:23,126 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 723 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2364, Invalid=3186, Unknown=0, NotChecked=0, Total=5550 [2021-11-20 23:36:23,127 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 4562 mSDsluCounter, 737 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4562 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 1000 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:23,127 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4562 Valid, 612 Invalid, 1000 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 680 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:36:23,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1191 states. [2021-11-20 23:36:23,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1191 to 163. [2021-11-20 23:36:23,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0696202531645569) internal successors, (169), 162 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 169 transitions. [2021-11-20 23:36:23,149 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 169 transitions. Word has length 74 [2021-11-20 23:36:23,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:23,149 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 169 transitions. [2021-11-20 23:36:23,149 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 2.028985507246377) internal successors, (140), 68 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,150 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 169 transitions. [2021-11-20 23:36:23,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-20 23:36:23,151 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:23,151 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 2, 2, 2, 1, 1, 1, 1] [2021-11-20 23:36:23,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:23,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:23,366 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:23,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:23,366 INFO L85 PathProgramCache]: Analyzing trace with hash -1203797835, now seen corresponding path program 2 times [2021-11-20 23:36:23,366 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:23,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1809532790] [2021-11-20 23:36:23,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:23,367 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:23,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:25,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4360 backedges. 0 proven. 4356 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:36:25,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:25,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1809532790] [2021-11-20 23:36:25,425 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1809532790] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:25,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563788392] [2021-11-20 23:36:25,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:25,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:25,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:25,437 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:25,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:36:25,481 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-20 23:36:25,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:25,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:36:25,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:25,507 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:36:25,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:27,122 INFO L134 CoverageAnalysis]: Checked inductivity of 4360 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4357 trivial. 0 not checked. [2021-11-20 23:36:27,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:29,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4360 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4357 trivial. 0 not checked. [2021-11-20 23:36:29,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563788392] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:29,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104543003] [2021-11-20 23:36:29,697 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:29,697 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:29,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:29,698 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:29,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:29,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:29,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:29,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:36:30,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:30,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:30,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:30,118 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:36:30,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2021-11-20 23:36:30,534 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 25 treesize of output 21 [2021-11-20 23:36:30,666 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 25 treesize of output 21 [2021-11-20 23:36:30,939 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:30,962 INFO L354 Elim1Store]: treesize reduction 88, result has 22.1 percent of original size [2021-11-20 23:36:30,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 61 [2021-11-20 23:36:31,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,401 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:31,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:31,463 INFO L354 Elim1Store]: treesize reduction 261, result has 12.4 percent of original size [2021-11-20 23:36:31,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 139 [2021-11-20 23:36:31,819 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:31,829 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:31,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:32,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:32,056 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:32,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:32,156 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:33,013 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:33,013 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:33,013 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 2, 2] total 72 [2021-11-20 23:36:33,013 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664844995] [2021-11-20 23:36:33,013 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:33,014 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:36:33,014 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:33,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:36:33,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2374, Invalid=3788, Unknown=0, NotChecked=0, Total=6162 [2021-11-20 23:36:33,017 INFO L87 Difference]: Start difference. First operand 163 states and 169 transitions. Second operand has 73 states, 73 states have (on average 2.232876712328767) internal successors, (163), 72 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:43,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:43,432 INFO L93 Difference]: Finished difference Result 1082 states and 1212 transitions. [2021-11-20 23:36:43,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2021-11-20 23:36:43,432 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.232876712328767) internal successors, (163), 72 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2021-11-20 23:36:43,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:43,439 INFO L225 Difference]: With dead ends: 1082 [2021-11-20 23:36:43,439 INFO L226 Difference]: Without dead ends: 1082 [2021-11-20 23:36:43,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 415 SyntacticMatches, 2 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9789 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=14235, Invalid=30921, Unknown=0, NotChecked=0, Total=45156 [2021-11-20 23:36:43,451 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 5689 mSDsluCounter, 469 mSDsCounter, 0 mSdLazyCounter, 765 mSolverCounterSat, 419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5689 SdHoareTripleChecker+Valid, 408 SdHoareTripleChecker+Invalid, 1216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 419 IncrementalHoareTripleChecker+Valid, 765 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:43,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5689 Valid, 408 Invalid, 1216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [419 Valid, 765 Invalid, 0 Unknown, 32 Unchecked, 1.1s Time] [2021-11-20 23:36:43,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2021-11-20 23:36:43,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 420. [2021-11-20 23:36:43,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 416 states have (on average 1.3245192307692308) internal successors, (551), 419 states have internal predecessors, (551), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:43,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 551 transitions. [2021-11-20 23:36:43,472 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 551 transitions. Word has length 142 [2021-11-20 23:36:43,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:43,472 INFO L470 AbstractCegarLoop]: Abstraction has 420 states and 551 transitions. [2021-11-20 23:36:43,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 2.232876712328767) internal successors, (163), 72 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:43,473 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 551 transitions. [2021-11-20 23:36:43,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-20 23:36:43,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:43,474 INFO L514 BasicCegarLoop]: trace histogram [67, 67, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:43,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:43,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:36:43,684 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:36:43,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:43,684 INFO L85 PathProgramCache]: Analyzing trace with hash -2094374519, now seen corresponding path program 1 times [2021-11-20 23:36:43,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:43,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2115002485] [2021-11-20 23:36:43,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:43,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:43,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:43,823 INFO L134 CoverageAnalysis]: Checked inductivity of 4491 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4489 trivial. 0 not checked. [2021-11-20 23:36:43,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:43,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2115002485] [2021-11-20 23:36:43,824 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2115002485] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:43,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251951569] [2021-11-20 23:36:43,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:43,825 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:43,825 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:43,832 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:43,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:36:43,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:43,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 743 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-20 23:36:43,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:46,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4491 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:46,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:51,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4491 backedges. 0 proven. 4489 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:36:51,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251951569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:51,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1886551108] [2021-11-20 23:36:51,245 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2021-11-20 23:36:51,245 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:51,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:51,246 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:51,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:51,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:51,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:51,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:51,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:51,576 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:51,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:36:52,106 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 25 treesize of output 21 [2021-11-20 23:36:52,203 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 25 treesize of output 21 [2021-11-20 23:36:52,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:52,477 INFO L354 Elim1Store]: treesize reduction 88, result has 22.1 percent of original size [2021-11-20 23:36:52,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 61 [2021-11-20 23:36:52,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:52,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:52,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:52,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:52,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:52,867 INFO L354 Elim1Store]: treesize reduction 261, result has 12.4 percent of original size [2021-11-20 23:36:52,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 139 [2021-11-20 23:36:53,226 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:53,235 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:53,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:53,407 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:53,417 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:36:53,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:53,590 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:54,466 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:54,466 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:54,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 69, 69] total 141 [2021-11-20 23:36:54,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740051662] [2021-11-20 23:36:54,467 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:54,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 142 states [2021-11-20 23:36:54,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:54,470 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 142 interpolants. [2021-11-20 23:36:54,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9635, Invalid=12715, Unknown=0, NotChecked=0, Total=22350 [2021-11-20 23:36:54,472 INFO L87 Difference]: Start difference. First operand 420 states and 551 transitions. Second operand has 142 states, 142 states have (on average 2.063380281690141) internal successors, (293), 141 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:38,649 INFO L93 Difference]: Finished difference Result 3402 states and 3539 transitions. [2021-11-20 23:37:38,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 275 states. [2021-11-20 23:37:38,650 INFO L78 Accepts]: Start accepts. Automaton has has 142 states, 142 states have (on average 2.063380281690141) internal successors, (293), 141 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 145 [2021-11-20 23:37:38,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:38,670 INFO L225 Difference]: With dead ends: 3402 [2021-11-20 23:37:38,670 INFO L226 Difference]: Without dead ends: 3402 [2021-11-20 23:37:38,689 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 419 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43728 ImplicationChecksByTransitivity, 24.1s TimeCoverageRelationStatistics Valid=56756, Invalid=120064, Unknown=0, NotChecked=0, Total=176820 [2021-11-20 23:37:38,690 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 17582 mSDsluCounter, 828 mSDsCounter, 0 mSdLazyCounter, 1666 mSolverCounterSat, 1804 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17582 SdHoareTripleChecker+Valid, 833 SdHoareTripleChecker+Invalid, 3470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1804 IncrementalHoareTripleChecker+Valid, 1666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:38,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17582 Valid, 833 Invalid, 3470 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1804 Valid, 1666 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-20 23:37:38,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3402 states. [2021-11-20 23:37:38,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3402 to 560. [2021-11-20 23:37:38,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 560 states, 556 states have (on average 1.2428057553956835) internal successors, (691), 559 states have internal predecessors, (691), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 691 transitions. [2021-11-20 23:37:38,724 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 691 transitions. Word has length 145 [2021-11-20 23:37:38,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:38,724 INFO L470 AbstractCegarLoop]: Abstraction has 560 states and 691 transitions. [2021-11-20 23:37:38,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 142 states, 142 states have (on average 2.063380281690141) internal successors, (293), 141 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:38,725 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 691 transitions. [2021-11-20 23:37:38,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-11-20 23:37:38,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:38,728 INFO L514 BasicCegarLoop]: trace histogram [136, 136, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:38,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:38,941 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:37:38,941 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:37:38,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:38,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1345429381, now seen corresponding path program 1 times [2021-11-20 23:37:38,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:38,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415422332] [2021-11-20 23:37:38,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:38,942 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:39,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:39,258 INFO L134 CoverageAnalysis]: Checked inductivity of 18498 backedges. 0 proven. 271 refuted. 0 times theorem prover too weak. 18227 trivial. 0 not checked. [2021-11-20 23:37:39,258 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:39,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415422332] [2021-11-20 23:37:39,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415422332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:39,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495866136] [2021-11-20 23:37:39,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:39,259 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:39,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:39,260 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:39,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:37:39,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:39,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 1439 conjuncts, 138 conjunts are in the unsatisfiable core [2021-11-20 23:37:39,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:46,474 INFO L134 CoverageAnalysis]: Checked inductivity of 18498 backedges. 0 proven. 18496 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:37:46,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:05,245 INFO L134 CoverageAnalysis]: Checked inductivity of 18498 backedges. 0 proven. 18496 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:38:05,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495866136] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:05,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1773578612] [2021-11-20 23:38:05,247 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:38:05,247 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:05,248 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:05,248 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:05,248 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:05,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:38:05,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:38:05,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:05,609 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:05,635 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:38:05,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 234 treesize of output 233 [2021-11-20 23:38:06,383 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 25 treesize of output 21 [2021-11-20 23:38:06,482 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 25 treesize of output 21 [2021-11-20 23:38:06,775 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:06,794 INFO L354 Elim1Store]: treesize reduction 88, result has 22.1 percent of original size [2021-11-20 23:38:06,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 77 treesize of output 61 [2021-11-20 23:38:07,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:07,307 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:07,357 INFO L354 Elim1Store]: treesize reduction 261, result has 12.4 percent of original size [2021-11-20 23:38:07,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 12 case distinctions, treesize of input 173 treesize of output 139 [2021-11-20 23:38:07,730 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:07,741 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:38:07,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:38:08,049 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:38:08,060 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:38:08,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:38:08,323 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:09,762 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:09,762 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:09,762 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 138, 138] total 278 [2021-11-20 23:38:09,762 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216732495] [2021-11-20 23:38:09,763 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:09,764 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 279 states [2021-11-20 23:38:09,764 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:09,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 279 interpolants. [2021-11-20 23:38:09,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38266, Invalid=44390, Unknown=0, NotChecked=0, Total=82656 [2021-11-20 23:38:09,774 INFO L87 Difference]: Start difference. First operand 560 states and 691 transitions. Second operand has 279 states, 279 states have (on average 2.050179211469534) internal successors, (572), 278 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:58,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:58,904 INFO L93 Difference]: Finished difference Result 6578 states and 6853 transitions. [2021-11-20 23:45:58,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 551 states. [2021-11-20 23:45:58,905 INFO L78 Accepts]: Start accepts. Automaton has has 279 states, 279 states have (on average 2.050179211469534) internal successors, (572), 278 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 284 [2021-11-20 23:45:58,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:58,937 INFO L225 Difference]: With dead ends: 6578 [2021-11-20 23:45:58,937 INFO L226 Difference]: Without dead ends: 6578 [2021-11-20 23:45:58,983 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1400 GetRequests, 567 SyntacticMatches, 0 SemanticMatches, 833 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173592 ImplicationChecksByTransitivity, 87.7s TimeCoverageRelationStatistics Valid=227187, Invalid=469203, Unknown=0, NotChecked=0, Total=696390 [2021-11-20 23:45:58,984 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 34791 mSDsluCounter, 1656 mSDsCounter, 0 mSdLazyCounter, 3324 mSolverCounterSat, 3161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34791 SdHoareTripleChecker+Valid, 1661 SdHoareTripleChecker+Invalid, 6485 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 3161 IncrementalHoareTripleChecker+Valid, 3324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:58,984 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34791 Valid, 1661 Invalid, 6485 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [3161 Valid, 3324 Invalid, 0 Unknown, 0 Unchecked, 4.9s Time] [2021-11-20 23:45:58,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6578 states. [2021-11-20 23:45:59,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6578 to 837. [2021-11-20 23:45:59,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 833 states have (on average 1.162064825930372) internal successors, (968), 836 states have internal predecessors, (968), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 968 transitions. [2021-11-20 23:45:59,047 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 968 transitions. Word has length 284 [2021-11-20 23:45:59,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:59,048 INFO L470 AbstractCegarLoop]: Abstraction has 837 states and 968 transitions. [2021-11-20 23:45:59,048 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 279 states, 279 states have (on average 2.050179211469534) internal successors, (572), 278 states have internal predecessors, (572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,049 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 968 transitions. [2021-11-20 23:45:59,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 563 [2021-11-20 23:45:59,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:59,064 INFO L514 BasicCegarLoop]: trace histogram [274, 274, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:59,108 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:59,292 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:45:59,292 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 10 more)] === [2021-11-20 23:45:59,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:59,292 INFO L85 PathProgramCache]: Analyzing trace with hash -796841242, now seen corresponding path program 1 times [2021-11-20 23:45:59,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:59,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171682411] [2021-11-20 23:45:59,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:59,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:00,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:28,584 INFO L134 CoverageAnalysis]: Checked inductivity of 75078 backedges. 0 proven. 75076 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:46:28,584 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:28,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171682411] [2021-11-20 23:46:28,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171682411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:28,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1250396571] [2021-11-20 23:46:28,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:28,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:28,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:28,600 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:28,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d2e494d6-99de-4eb2-82cd-83915e05d555/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:46:29,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:29,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 2831 conjuncts, 276 conjunts are in the unsatisfiable core [2021-11-20 23:46:29,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:30,714 INFO L134 CoverageAnalysis]: Checked inductivity of 75078 backedges. 0 proven. 75076 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:46:30,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:54,965 INFO L134 CoverageAnalysis]: Checked inductivity of 75078 backedges. 0 proven. 75076 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:47:54,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1250396571] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:54,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1334416058] [2021-11-20 23:47:54,967 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2021-11-20 23:47:54,967 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:54,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:54,968 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:54,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:55,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:47:55,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:47:55,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:55,401 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:47:55,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 244 treesize of output 232 [2021-11-20 23:47:55,894 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 25 treesize of output 21 [2021-11-20 23:47:56,040 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 25 treesize of output 21 [2021-11-20 23:47:56,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:47:56,368 INFO L354 Elim1Store]: treesize reduction 68, result has 22.7 percent of original size [2021-11-20 23:47:56,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 62 treesize of output 51 [2021-11-20 23:47:56,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:47:56,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:47:56,904 INFO L354 Elim1Store]: treesize reduction 317, result has 17.0 percent of original size [2021-11-20 23:47:56,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 165 treesize of output 150 [2021-11-20 23:47:57,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:47:57,390 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:47:57,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:47:57,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:47:57,679 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-20 23:47:57,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:47:58,294 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:01,820 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:01,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:01,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [276, 276, 276] total 552 [2021-11-20 23:48:01,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403698815] [2021-11-20 23:48:01,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:01,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 553 states [2021-11-20 23:48:01,823 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:01,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 553 interpolants. [2021-11-20 23:48:01,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152667, Invalid=163739, Unknown=0, NotChecked=0, Total=316406 [2021-11-20 23:48:01,868 INFO L87 Difference]: Start difference. First operand 837 states and 968 transitions. Second operand has 553 states, 553 states have (on average 2.0144665461121156) internal successors, (1114), 552 states have internal predecessors, (1114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)