./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 6f838ff631dd7d907eee223e4bc065b6ce71a3dd1969d0a88cef9ccdcf3b54d1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:12:15,606 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:12:15,610 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:12:15,678 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:12:15,679 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:12:15,682 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:12:15,684 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:12:15,689 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:12:15,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:12:15,700 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:12:15,701 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:12:15,704 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:12:15,705 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:12:15,708 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:12:15,711 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:12:15,717 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:12:15,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:12:15,721 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:12:15,724 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:12:15,733 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:12:15,736 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:12:15,738 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:12:15,742 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:12:15,743 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:12:15,754 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:12:15,755 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:12:15,756 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:12:15,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:12:15,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:12:15,762 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:12:15,762 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:12:15,764 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:12:15,767 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:12:15,769 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:12:15,771 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:12:15,771 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:12:15,772 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:12:15,773 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:12:15,773 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:12:15,774 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:12:15,775 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:12:15,776 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-23 02:12:15,830 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:12:15,831 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:12:15,831 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:12:15,832 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:12:15,833 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:12:15,833 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:12:15,833 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:12:15,834 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:12:15,834 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:12:15,834 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:12:15,834 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:12:15,835 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:12:15,835 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:12:15,835 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:12:15,836 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:12:15,836 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:12:15,836 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:12:15,836 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:12:15,837 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:12:15,838 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:12:15,838 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:12:15,838 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:12:15,839 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:12:15,839 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:12:15,839 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:12:15,839 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:12:15,840 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:12:15,840 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:12:15,840 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:12:15,841 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:12:15,841 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:12:15,841 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:12:15,842 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:12:15,842 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:12:15,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:12:15,842 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:12:15,843 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:12:15,843 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:12:15,843 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_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6f838ff631dd7d907eee223e4bc065b6ce71a3dd1969d0a88cef9ccdcf3b54d1 [2021-11-23 02:12:16,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:12:16,230 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:12:16,234 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:12:16,236 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:12:16,237 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:12:16,239 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i [2021-11-23 02:12:16,325 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/data/30922abe2/4b757177205047ba86bd696a92fce178/FLAGeb3c184e9 [2021-11-23 02:12:17,242 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:12:17,243 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i [2021-11-23 02:12:17,315 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/data/30922abe2/4b757177205047ba86bd696a92fce178/FLAGeb3c184e9 [2021-11-23 02:12:17,749 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/data/30922abe2/4b757177205047ba86bd696a92fce178 [2021-11-23 02:12:17,752 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:12:17,753 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:12:17,755 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:12:17,755 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:12:17,760 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:12:17,761 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:12:17" (1/1) ... [2021-11-23 02:12:17,762 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@588b7701 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:17, skipping insertion in model container [2021-11-23 02:12:17,763 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:12:17" (1/1) ... [2021-11-23 02:12:17,772 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:12:17,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:12:18,162 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_06dab642-5dce-4d2f-8c29-10762d788acf/sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i[4493,4506] [2021-11-23 02:12:18,172 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_06dab642-5dce-4d2f-8c29-10762d788acf/sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i[4553,4566] [2021-11-23 02:12:19,252 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-23 02:12:19,382 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,383 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,383 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,384 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,385 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,405 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,406 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,409 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,409 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,412 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,413 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,414 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,414 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:19,870 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-23 02:12:19,872 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-23 02:12:19,874 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-23 02:12:19,875 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-23 02:12:19,877 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-23 02:12:19,878 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-23 02:12:19,879 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-23 02:12:19,880 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-23 02:12:19,881 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-23 02:12:19,882 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-23 02:12:20,129 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,137 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,143 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,169 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,278 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:12:20,316 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:12:20,334 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_06dab642-5dce-4d2f-8c29-10762d788acf/sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i[4493,4506] [2021-11-23 02:12:20,335 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_06dab642-5dce-4d2f-8c29-10762d788acf/sv-benchmarks/c/aws-c-common/aws_array_list_swap_harness.i[4553,4566] [2021-11-23 02:12:20,377 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-23 02:12:20,397 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,398 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,398 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,399 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,400 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,408 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,409 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,410 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,411 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,412 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,413 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,417 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,418 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,491 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-23 02:12:20,494 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-23 02:12:20,495 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-23 02:12:20,496 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-23 02:12:20,498 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-23 02:12:20,499 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-23 02:12:20,503 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-23 02:12:20,504 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-23 02:12:20,505 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-23 02:12:20,506 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-23 02:12:20,598 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,605 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,607 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,612 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 02:12:20,675 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:12:21,040 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:12:21,040 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21 WrapperNode [2021-11-23 02:12:21,040 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:12:21,042 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:12:21,042 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:12:21,042 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:12:21,053 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,254 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,408 INFO L137 Inliner]: procedures = 691, calls = 1682, calls flagged for inlining = 52, calls inlined = 8, statements flattened = 649 [2021-11-23 02:12:21,408 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:12:21,409 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:12:21,410 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:12:21,410 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:12:21,420 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,437 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,453 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,527 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,533 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,566 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:12:21,582 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:12:21,582 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:12:21,582 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:12:21,583 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (1/1) ... [2021-11-23 02:12:21,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:12:21,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:21,645 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:12:21,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:12:21,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 02:12:21,701 INFO L130 BoogieDeclarations]: Found specification of procedure aws_array_list_is_bounded [2021-11-23 02:12:21,701 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_array_list_is_bounded [2021-11-23 02:12:21,701 INFO L130 BoogieDeclarations]: Found specification of procedure aws_array_list_is_valid [2021-11-23 02:12:21,701 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_array_list_is_valid [2021-11-23 02:12:21,701 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_bool [2021-11-23 02:12:21,702 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_bool [2021-11-23 02:12:21,702 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:12:21,702 INFO L130 BoogieDeclarations]: Found specification of procedure aws_raise_error [2021-11-23 02:12:21,702 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_raise_error [2021-11-23 02:12:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:12:21,703 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:12:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:12:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:12:21,703 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 02:12:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure memcpy_impl [2021-11-23 02:12:21,704 INFO L138 BoogieDeclarations]: Found implementation of procedure memcpy_impl [2021-11-23 02:12:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:12:21,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:12:21,704 INFO L130 BoogieDeclarations]: Found specification of procedure bounded_malloc [2021-11-23 02:12:21,705 INFO L138 BoogieDeclarations]: Found implementation of procedure bounded_malloc [2021-11-23 02:12:21,705 INFO L130 BoogieDeclarations]: Found specification of procedure aws_mul_size_checked [2021-11-23 02:12:21,705 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_mul_size_checked [2021-11-23 02:12:21,705 INFO L130 BoogieDeclarations]: Found specification of procedure aws_array_list_length [2021-11-23 02:12:21,705 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_array_list_length [2021-11-23 02:12:21,706 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 02:12:21,706 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 02:12:21,706 INFO L130 BoogieDeclarations]: Found specification of procedure my_memcpy [2021-11-23 02:12:21,706 INFO L138 BoogieDeclarations]: Found implementation of procedure my_memcpy [2021-11-23 02:12:21,707 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 02:12:21,707 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 02:12:21,707 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 02:12:21,707 INFO L130 BoogieDeclarations]: Found specification of procedure aws_array_list_get_at_ptr [2021-11-23 02:12:21,707 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_array_list_get_at_ptr [2021-11-23 02:12:21,708 INFO L130 BoogieDeclarations]: Found specification of procedure can_fail_allocator [2021-11-23 02:12:21,708 INFO L138 BoogieDeclarations]: Found implementation of procedure can_fail_allocator [2021-11-23 02:12:21,708 INFO L130 BoogieDeclarations]: Found specification of procedure __CPROVER_overflow_mult [2021-11-23 02:12:21,708 INFO L138 BoogieDeclarations]: Found implementation of procedure __CPROVER_overflow_mult [2021-11-23 02:12:21,708 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:12:21,709 INFO L130 BoogieDeclarations]: Found specification of procedure ensure_array_list_has_allocated_data_member [2021-11-23 02:12:21,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ensure_array_list_has_allocated_data_member [2021-11-23 02:12:21,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:12:22,065 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:12:22,068 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:12:23,575 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:12:23,751 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:12:23,752 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:12:23,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:12:23 BoogieIcfgContainer [2021-11-23 02:12:23,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:12:23,761 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:12:23,761 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:12:23,766 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:12:23,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:12:17" (1/3) ... [2021-11-23 02:12:23,769 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77bfb64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:12:23, skipping insertion in model container [2021-11-23 02:12:23,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:12:21" (2/3) ... [2021-11-23 02:12:23,774 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77bfb64 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:12:23, skipping insertion in model container [2021-11-23 02:12:23,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:12:23" (3/3) ... [2021-11-23 02:12:23,777 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_array_list_swap_harness.i [2021-11-23 02:12:23,787 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:12:23,788 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:12:23,873 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:12:23,894 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:12:23,901 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:12:23,933 INFO L276 IsEmpty]: Start isEmpty. Operand has 151 states, 73 states have (on average 1.1369863013698631) internal successors, (83), 74 states have internal predecessors, (83), 61 states have call successors, (61), 15 states have call predecessors, (61), 15 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) [2021-11-23 02:12:23,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 02:12:23,946 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:23,947 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:23,948 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:23,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:23,955 INFO L85 PathProgramCache]: Analyzing trace with hash -333435140, now seen corresponding path program 1 times [2021-11-23 02:12:23,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:23,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832922740] [2021-11-23 02:12:23,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:23,969 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:24,814 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 02:12:24,815 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:24,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832922740] [2021-11-23 02:12:24,816 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832922740] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:24,816 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367525907] [2021-11-23 02:12:24,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:24,817 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:24,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:24,827 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:24,834 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:12:25,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:25,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 1973 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 02:12:25,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:25,720 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:12:25,721 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:25,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367525907] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:25,722 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:12:25,722 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-23 02:12:25,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104951891] [2021-11-23 02:12:25,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:25,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:12:25,734 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:25,781 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:12:25,782 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:12:25,787 INFO L87 Difference]: Start difference. First operand has 151 states, 73 states have (on average 1.1369863013698631) internal successors, (83), 74 states have internal predecessors, (83), 61 states have call successors, (61), 15 states have call predecessors, (61), 15 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:12:26,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:26,494 INFO L93 Difference]: Finished difference Result 273 states and 398 transitions. [2021-11-23 02:12:26,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:12:26,498 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 54 [2021-11-23 02:12:26,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:26,518 INFO L225 Difference]: With dead ends: 273 [2021-11-23 02:12:26,518 INFO L226 Difference]: Without dead ends: 151 [2021-11-23 02:12:26,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:12:26,531 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 31 mSDsluCounter, 479 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 596 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:26,534 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 596 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:12:26,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-11-23 02:12:26,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-11-23 02:12:26,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 73 states have (on average 1.1232876712328768) internal successors, (82), 75 states have internal predecessors, (82), 61 states have call successors, (61), 15 states have call predecessors, (61), 16 states have return successors, (68), 60 states have call predecessors, (68), 60 states have call successors, (68) [2021-11-23 02:12:26,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 211 transitions. [2021-11-23 02:12:26,639 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 211 transitions. Word has length 54 [2021-11-23 02:12:26,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:26,641 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 211 transitions. [2021-11-23 02:12:26,641 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 5 states have internal predecessors, (24), 3 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 02:12:26,642 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 211 transitions. [2021-11-23 02:12:26,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-23 02:12:26,648 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:26,649 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:26,680 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 02:12:26,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-23 02:12:26,862 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:26,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:26,863 INFO L85 PathProgramCache]: Analyzing trace with hash 211094557, now seen corresponding path program 1 times [2021-11-23 02:12:26,863 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:26,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26991118] [2021-11-23 02:12:26,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:26,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:26,964 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:12:26,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1285265407] [2021-11-23 02:12:26,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:26,966 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:26,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:26,967 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:26,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:12:27,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:27,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 2083 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:12:27,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:27,656 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 02:12:27,656 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:12:27,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:27,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26991118] [2021-11-23 02:12:27,657 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:12:27,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285265407] [2021-11-23 02:12:27,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285265407] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:12:27,658 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:12:27,658 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 02:12:27,659 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105912964] [2021-11-23 02:12:27,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:12:27,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:12:27,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:27,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:12:27,662 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 02:12:27,662 INFO L87 Difference]: Start difference. First operand 151 states and 211 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:12:29,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:29,424 INFO L93 Difference]: Finished difference Result 278 states and 397 transitions. [2021-11-23 02:12:29,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:12:29,430 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 63 [2021-11-23 02:12:29,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:29,434 INFO L225 Difference]: With dead ends: 278 [2021-11-23 02:12:29,434 INFO L226 Difference]: Without dead ends: 161 [2021-11-23 02:12:29,437 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:12:29,439 INFO L933 BasicCegarLoop]: 166 mSDtfsCounter, 36 mSDsluCounter, 834 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 919 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:29,440 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 919 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-23 02:12:29,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-11-23 02:12:29,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 161. [2021-11-23 02:12:29,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 77 states have (on average 1.1168831168831168) internal successors, (86), 79 states have internal predecessors, (86), 66 states have call successors, (66), 16 states have call predecessors, (66), 17 states have return successors, (73), 65 states have call predecessors, (73), 65 states have call successors, (73) [2021-11-23 02:12:29,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 225 transitions. [2021-11-23 02:12:29,469 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 225 transitions. Word has length 63 [2021-11-23 02:12:29,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:29,470 INFO L470 AbstractCegarLoop]: Abstraction has 161 states and 225 transitions. [2021-11-23 02:12:29,471 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 6 states have internal predecessors, (32), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-23 02:12:29,471 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 225 transitions. [2021-11-23 02:12:29,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-23 02:12:29,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:29,474 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:29,516 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-23 02:12:29,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:29,694 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:29,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:29,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1014181917, now seen corresponding path program 1 times [2021-11-23 02:12:29,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:29,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286611822] [2021-11-23 02:12:29,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:29,695 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:29,811 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:12:29,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1018168680] [2021-11-23 02:12:29,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:29,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:29,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:29,814 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:29,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06dab642-5dce-4d2f-8c29-10762d788acf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:12:30,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:30,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 2303 conjuncts, 253 conjunts are in the unsatisfiable core [2021-11-23 02:12:30,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:30,676 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 0 case distinctions, treesize of input 6 treesize of output 5 [2021-11-23 02:12:31,529 INFO L354 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2021-11-23 02:12:31,530 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 38 treesize of output 29 [2021-11-23 02:12:37,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:12:37,906 INFO L354 Elim1Store]: treesize reduction 64, result has 22.9 percent of original size [2021-11-23 02:12:37,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 113 treesize of output 115 [2021-11-23 02:12:37,993 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-23 02:12:37,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 116 treesize of output 113 [2021-11-23 02:12:42,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 76 [2021-11-23 02:12:43,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 70 [2021-11-23 02:13:06,575 INFO L354 Elim1Store]: treesize reduction 184, result has 10.2 percent of original size [2021-11-23 02:13:06,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 15 case distinctions, treesize of input 150 treesize of output 153 [2021-11-23 02:13:06,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:06,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:06,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:06,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:06,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:13:06,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:13:07,434 INFO L354 Elim1Store]: treesize reduction 143, result has 21.4 percent of original size [2021-11-23 02:13:07,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 6 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 17 case distinctions, treesize of input 138 treesize of output 172