./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --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 fab5c58d108ab0116c19af669265df6088034967e28562e9e7d2713e6ada683d --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:36:59,371 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:36:59,437 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-12-02 14:36:59,441 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:36:59,441 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:36:59,466 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:36:59,466 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:36:59,467 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:36:59,468 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:36:59,468 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:36:59,469 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:36:59,469 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:36:59,470 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:36:59,470 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:36:59,471 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:36:59,471 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:36:59,472 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:36:59,472 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:36:59,473 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:36:59,473 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:36:59,474 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:36:59,475 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:36:59,476 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:36:59,476 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:36:59,477 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:36:59,477 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:36:59,477 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:36:59,478 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:36:59,478 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:36:59,479 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:36:59,479 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:36:59,479 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:36:59,480 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:36:59,480 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:36:59,480 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:36:59,480 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:36:59,481 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:36:59,481 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:36:59,481 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:36:59,481 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:36:59,481 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:36:59,482 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:36:59,482 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:36:59,482 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:36:59,482 INFO L153 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_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fab5c58d108ab0116c19af669265df6088034967e28562e9e7d2713e6ada683d [2023-12-02 14:36:59,712 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:36:59,733 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:36:59,736 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:36:59,737 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:36:59,737 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:36:59,739 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i [2023-12-02 14:37:02,475 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:37:02,868 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:37:02,869 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i [2023-12-02 14:37:02,895 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/data/098dc5f97/1f6e161a8b3043f2a908c2b912226f43/FLAG6a22b15f3 [2023-12-02 14:37:02,908 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/data/098dc5f97/1f6e161a8b3043f2a908c2b912226f43 [2023-12-02 14:37:02,910 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:37:02,911 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:37:02,912 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:37:02,912 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:37:02,916 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:37:02,917 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:37:02" (1/1) ... [2023-12-02 14:37:02,918 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51ae760 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:02, skipping insertion in model container [2023-12-02 14:37:02,919 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:37:02" (1/1) ... [2023-12-02 14:37:02,992 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:37:03,207 WARN L240 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_f08c5292-5872-49a0-8834-d0a210e0ab5f/sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i[4503,4516] [2023-12-02 14:37:03,212 WARN L240 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_f08c5292-5872-49a0-8834-d0a210e0ab5f/sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i[4563,4576] [2023-12-02 14:37:03,954 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,955 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,955 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,956 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,958 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,971 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,971 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,973 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,973 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,975 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,975 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,976 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:03,976 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,412 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 14:37:04,414 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 14:37:04,415 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 14:37:04,416 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 14:37:04,418 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 14:37:04,419 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 14:37:04,419 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 14:37:04,435 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 14:37:04,437 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 14:37:04,438 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 14:37:04,605 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:37:04,625 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:37:04,640 WARN L240 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_f08c5292-5872-49a0-8834-d0a210e0ab5f/sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i[4503,4516] [2023-12-02 14:37:04,641 WARN L240 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_f08c5292-5872-49a0-8834-d0a210e0ab5f/sv-benchmarks/c/aws-c-common/aws_linked_list_swap_contents_harness.i[4563,4576] [2023-12-02 14:37:04,687 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,688 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,688 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,689 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,690 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,701 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,702 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,704 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,704 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,705 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,706 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,707 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,708 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 14:37:04,747 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 14:37:04,748 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 14:37:04,748 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 14:37:04,749 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 14:37:04,750 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 14:37:04,751 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 14:37:04,752 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 14:37:04,753 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 14:37:04,753 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 14:37:04,754 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 14:37:04,798 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:37:04,955 WARN L675 CHandler]: The function __atomic_fetch_or is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,955 WARN L675 CHandler]: The function __atomic_fetch_sub is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function __atomic_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function __atomic_fetch_xor is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function htons is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function ntohl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function __atomic_compare_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,956 WARN L675 CHandler]: The function __atomic_fetch_add is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function htonl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function __atomic_store_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function ntohs is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function __atomic_load_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,957 WARN L675 CHandler]: The function __atomic_thread_fence is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,958 WARN L675 CHandler]: The function __atomic_fetch_and is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,958 WARN L675 CHandler]: The function aws_array_list_ensure_capacity is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 14:37:04,964 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:37:04,964 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04 WrapperNode [2023-12-02 14:37:04,964 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:37:04,965 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:37:04,965 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:37:04,965 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:37:04,970 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,027 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,065 INFO L138 Inliner]: procedures = 678, calls = 1080, calls flagged for inlining = 51, calls inlined = 5, statements flattened = 212 [2023-12-02 14:37:05,066 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:37:05,067 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:37:05,067 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:37:05,067 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:37:05,076 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,076 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,080 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,081 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,101 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,105 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,109 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,113 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,119 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:37:05,120 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:37:05,120 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:37:05,121 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:37:05,121 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (1/1) ... [2023-12-02 14:37:05,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:37:05,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:05,155 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:37:05,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:37:05,185 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_init [2023-12-02 14:37:05,185 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_init [2023-12-02 14:37:05,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 14:37:05,186 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2023-12-02 14:37:05,186 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure ensure_linked_list_is_allocated [2023-12-02 14:37:05,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ensure_linked_list_is_allocated [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2023-12-02 14:37:05,186 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2023-12-02 14:37:05,186 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:37:05,187 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_empty [2023-12-02 14:37:05,187 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_empty [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 14:37:05,187 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:37:05,187 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 14:37:05,188 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-12-02 14:37:05,188 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2023-12-02 14:37:05,188 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2023-12-02 14:37:05,188 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:37:05,409 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:37:05,412 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:37:05,776 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:37:05,856 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:37:05,856 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 14:37:05,857 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:37:05 BoogieIcfgContainer [2023-12-02 14:37:05,858 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:37:05,860 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:37:05,860 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:37:05,863 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:37:05,863 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:37:02" (1/3) ... [2023-12-02 14:37:05,863 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6147a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:37:05, skipping insertion in model container [2023-12-02 14:37:05,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:37:04" (2/3) ... [2023-12-02 14:37:05,864 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a6147a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:37:05, skipping insertion in model container [2023-12-02 14:37:05,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:37:05" (3/3) ... [2023-12-02 14:37:05,865 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_swap_contents_harness.i [2023-12-02 14:37:05,880 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:37:05,880 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:37:05,923 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:37:05,928 INFO L357 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=LoopHeads, 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1775f9bc, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:37:05,929 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:37:05,932 INFO L276 IsEmpty]: Start isEmpty. Operand has 89 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 48 states have internal predecessors, (57), 34 states have call successors, (34), 8 states have call predecessors, (34), 8 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-12-02 14:37:05,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-12-02 14:37:05,941 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:05,942 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:05,942 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:05,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:05,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1917343217, now seen corresponding path program 1 times [2023-12-02 14:37:05,955 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:05,955 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759565677] [2023-12-02 14:37:05,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:05,955 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:06,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 14:37:06,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:06,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759565677] [2023-12-02 14:37:06,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759565677] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:06,874 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714338937] [2023-12-02 14:37:06,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:06,874 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:06,874 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:06,876 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:06,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:37:07,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:07,248 INFO L262 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 30 conjunts are in the unsatisfiable core [2023-12-02 14:37:07,259 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:07,402 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:37:07,403 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:07,403 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714338937] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:07,403 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:07,403 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5] total 9 [2023-12-02 14:37:07,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007062160] [2023-12-02 14:37:07,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:07,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:37:07,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:07,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:37:07,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:37:07,444 INFO L87 Difference]: Start difference. First operand has 89 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 48 states have internal predecessors, (57), 34 states have call successors, (34), 8 states have call predecessors, (34), 8 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) Second operand has 7 states, 4 states have (on average 6.25) internal successors, (25), 6 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 14:37:07,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:07,880 INFO L93 Difference]: Finished difference Result 166 states and 254 transitions. [2023-12-02 14:37:07,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:37:07,883 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 4 states have (on average 6.25) internal successors, (25), 6 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) Word has length 62 [2023-12-02 14:37:07,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:07,893 INFO L225 Difference]: With dead ends: 166 [2023-12-02 14:37:07,893 INFO L226 Difference]: Without dead ends: 87 [2023-12-02 14:37:07,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:37:07,900 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 28 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 543 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:07,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 543 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:37:07,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-12-02 14:37:07,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2023-12-02 14:37:07,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 43 states have (on average 1.255813953488372) internal successors, (54), 48 states have internal predecessors, (54), 34 states have call successors, (34), 8 states have call predecessors, (34), 9 states have return successors, (38), 32 states have call predecessors, (38), 32 states have call successors, (38) [2023-12-02 14:37:07,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 126 transitions. [2023-12-02 14:37:07,956 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 126 transitions. Word has length 62 [2023-12-02 14:37:07,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:07,957 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 126 transitions. [2023-12-02 14:37:07,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 4 states have (on average 6.25) internal successors, (25), 6 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 4 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2023-12-02 14:37:07,957 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 126 transitions. [2023-12-02 14:37:07,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 14:37:07,960 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:07,961 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:07,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-12-02 14:37:08,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 14:37:08,168 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:08,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:08,169 INFO L85 PathProgramCache]: Analyzing trace with hash -548156875, now seen corresponding path program 1 times [2023-12-02 14:37:08,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:08,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004035032] [2023-12-02 14:37:08,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:08,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:08,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:08,557 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:08,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:08,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004035032] [2023-12-02 14:37:08,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004035032] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:08,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290423158] [2023-12-02 14:37:08,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:08,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:08,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:08,559 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:08,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:37:08,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:08,881 INFO L262 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:37:08,885 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:08,962 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:37:08,963 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:08,963 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290423158] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:08,963 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:08,963 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-12-02 14:37:08,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153590397] [2023-12-02 14:37:08,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:08,964 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:37:08,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:08,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:37:08,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:37:08,966 INFO L87 Difference]: Start difference. First operand 87 states and 126 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 14:37:09,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:09,321 INFO L93 Difference]: Finished difference Result 163 states and 243 transitions. [2023-12-02 14:37:09,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:37:09,322 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 64 [2023-12-02 14:37:09,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:09,324 INFO L225 Difference]: With dead ends: 163 [2023-12-02 14:37:09,325 INFO L226 Difference]: Without dead ends: 90 [2023-12-02 14:37:09,326 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:37:09,328 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 49 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 184 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 184 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:09,329 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 464 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 184 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:37:09,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-12-02 14:37:09,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-12-02 14:37:09,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 45 states have (on average 1.2444444444444445) internal successors, (56), 51 states have internal predecessors, (56), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (42), 32 states have call predecessors, (42), 32 states have call successors, (42) [2023-12-02 14:37:09,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 132 transitions. [2023-12-02 14:37:09,349 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 132 transitions. Word has length 64 [2023-12-02 14:37:09,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:09,350 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 132 transitions. [2023-12-02 14:37:09,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 7 states have internal predecessors, (26), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 14:37:09,351 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 132 transitions. [2023-12-02 14:37:09,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-12-02 14:37:09,353 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:09,353 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:09,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:37:09,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 14:37:09,555 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:09,555 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:09,556 INFO L85 PathProgramCache]: Analyzing trace with hash 1707760095, now seen corresponding path program 1 times [2023-12-02 14:37:09,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:09,556 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330860478] [2023-12-02 14:37:09,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:09,556 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:09,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:09,924 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:09,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:09,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330860478] [2023-12-02 14:37:09,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330860478] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:09,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003552583] [2023-12-02 14:37:09,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:09,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:09,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:09,927 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:09,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:37:10,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:10,240 INFO L262 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:37:10,245 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:10,343 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:37:10,343 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:10,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003552583] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:10,344 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:10,344 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-12-02 14:37:10,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720280069] [2023-12-02 14:37:10,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:10,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:37:10,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:10,346 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:37:10,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:37:10,347 INFO L87 Difference]: Start difference. First operand 90 states and 132 transitions. Second operand has 8 states, 7 states have (on average 4.0) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 14:37:10,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:10,829 INFO L93 Difference]: Finished difference Result 176 states and 266 transitions. [2023-12-02 14:37:10,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:37:10,831 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 66 [2023-12-02 14:37:10,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:10,833 INFO L225 Difference]: With dead ends: 176 [2023-12-02 14:37:10,833 INFO L226 Difference]: Without dead ends: 100 [2023-12-02 14:37:10,834 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:37:10,835 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 73 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 538 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:10,836 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 538 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:37:10,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-12-02 14:37:10,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 92. [2023-12-02 14:37:10,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 53 states have internal predecessors, (59), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (42), 32 states have call predecessors, (42), 32 states have call successors, (42) [2023-12-02 14:37:10,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 135 transitions. [2023-12-02 14:37:10,855 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 135 transitions. Word has length 66 [2023-12-02 14:37:10,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:10,855 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 135 transitions. [2023-12-02 14:37:10,856 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 14:37:10,856 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 135 transitions. [2023-12-02 14:37:10,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 14:37:10,858 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:10,858 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:10,865 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:37:11,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-12-02 14:37:11,063 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:11,064 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:11,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1082274128, now seen corresponding path program 1 times [2023-12-02 14:37:11,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:11,064 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695145020] [2023-12-02 14:37:11,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:11,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:11,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:11,444 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:11,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:11,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695145020] [2023-12-02 14:37:11,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [695145020] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:11,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385348474] [2023-12-02 14:37:11,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:11,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:11,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:11,447 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:11,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:37:11,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:11,800 INFO L262 TraceCheckSpWp]: Trace formula consists of 638 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:37:11,804 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:11,822 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 14:37:11,822 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:11,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385348474] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:11,823 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:11,823 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-12-02 14:37:11,823 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340178043] [2023-12-02 14:37:11,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:11,824 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:37:11,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:11,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:37:11,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:37:11,825 INFO L87 Difference]: Start difference. First operand 92 states and 135 transitions. Second operand has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 14:37:11,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:11,886 INFO L93 Difference]: Finished difference Result 175 states and 269 transitions. [2023-12-02 14:37:11,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:37:11,886 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 67 [2023-12-02 14:37:11,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:11,888 INFO L225 Difference]: With dead ends: 175 [2023-12-02 14:37:11,888 INFO L226 Difference]: Without dead ends: 97 [2023-12-02 14:37:11,889 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:37:11,890 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 4 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:11,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 206 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:37:11,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-12-02 14:37:11,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2023-12-02 14:37:11,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 48 states have (on average 1.25) internal successors, (60), 54 states have internal predecessors, (60), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (42), 32 states have call predecessors, (42), 32 states have call successors, (42) [2023-12-02 14:37:11,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 136 transitions. [2023-12-02 14:37:11,907 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 136 transitions. Word has length 67 [2023-12-02 14:37:11,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:11,908 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 136 transitions. [2023-12-02 14:37:11,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.333333333333334) internal successors, (28), 3 states have internal predecessors, (28), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 14:37:11,908 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 136 transitions. [2023-12-02 14:37:11,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-12-02 14:37:11,910 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:11,910 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:11,918 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:37:12,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-12-02 14:37:12,114 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:12,114 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:12,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1960063026, now seen corresponding path program 1 times [2023-12-02 14:37:12,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:12,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989355713] [2023-12-02 14:37:12,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:12,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:12,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:12,409 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 14:37:12,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:12,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989355713] [2023-12-02 14:37:12,409 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989355713] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:12,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153343530] [2023-12-02 14:37:12,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:12,410 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:12,410 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:12,411 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:12,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:37:12,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:12,754 INFO L262 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 32 conjunts are in the unsatisfiable core [2023-12-02 14:37:12,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:12,838 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:37:12,838 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:12,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153343530] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:12,839 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:12,839 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [6] total 10 [2023-12-02 14:37:12,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714824730] [2023-12-02 14:37:12,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:12,840 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:37:12,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:12,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:37:12,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:37:12,841 INFO L87 Difference]: Start difference. First operand 93 states and 136 transitions. Second operand has 8 states, 5 states have (on average 6.2) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 14:37:13,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:13,169 INFO L93 Difference]: Finished difference Result 178 states and 269 transitions. [2023-12-02 14:37:13,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:37:13,169 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 5 states have (on average 6.2) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 70 [2023-12-02 14:37:13,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:13,171 INFO L225 Difference]: With dead ends: 178 [2023-12-02 14:37:13,171 INFO L226 Difference]: Without dead ends: 99 [2023-12-02 14:37:13,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:37:13,173 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 28 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:13,174 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 560 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:37:13,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-12-02 14:37:13,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 94. [2023-12-02 14:37:13,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 55 states have internal predecessors, (61), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (42), 32 states have call predecessors, (42), 32 states have call successors, (42) [2023-12-02 14:37:13,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 137 transitions. [2023-12-02 14:37:13,192 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 137 transitions. Word has length 70 [2023-12-02 14:37:13,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:13,192 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 137 transitions. [2023-12-02 14:37:13,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 5 states have (on average 6.2) internal successors, (31), 7 states have internal predecessors, (31), 5 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-12-02 14:37:13,192 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 137 transitions. [2023-12-02 14:37:13,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-12-02 14:37:13,194 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:13,194 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:13,201 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:37:13,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:13,399 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:13,399 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:13,399 INFO L85 PathProgramCache]: Analyzing trace with hash 2075614520, now seen corresponding path program 1 times [2023-12-02 14:37:13,400 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:13,400 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730578157] [2023-12-02 14:37:13,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:13,400 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:13,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:14,581 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:14,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:14,581 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730578157] [2023-12-02 14:37:14,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730578157] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:14,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [515047949] [2023-12-02 14:37:14,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:14,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:14,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:14,585 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:14,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:37:14,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:14,993 INFO L262 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 34 conjunts are in the unsatisfiable core [2023-12-02 14:37:14,998 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:15,158 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 14:37:15,158 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:37:15,158 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [515047949] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:37:15,158 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:37:15,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9] total 16 [2023-12-02 14:37:15,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764705432] [2023-12-02 14:37:15,159 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:37:15,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:37:15,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:37:15,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:37:15,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:37:15,161 INFO L87 Difference]: Start difference. First operand 94 states and 137 transitions. Second operand has 9 states, 6 states have (on average 5.5) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) [2023-12-02 14:37:15,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:37:15,559 INFO L93 Difference]: Finished difference Result 181 states and 274 transitions. [2023-12-02 14:37:15,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:37:15,560 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 5.5) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) Word has length 72 [2023-12-02 14:37:15,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:37:15,561 INFO L225 Difference]: With dead ends: 181 [2023-12-02 14:37:15,561 INFO L226 Difference]: Without dead ends: 101 [2023-12-02 14:37:15,562 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:37:15,563 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 30 mSDsluCounter, 547 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:37:15,564 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 650 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:37:15,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-12-02 14:37:15,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2023-12-02 14:37:15,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 50 states have (on average 1.24) internal successors, (62), 56 states have internal predecessors, (62), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (42), 32 states have call predecessors, (42), 32 states have call successors, (42) [2023-12-02 14:37:15,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 138 transitions. [2023-12-02 14:37:15,579 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 138 transitions. Word has length 72 [2023-12-02 14:37:15,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:37:15,580 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 138 transitions. [2023-12-02 14:37:15,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 5.5) internal successors, (33), 8 states have internal predecessors, (33), 6 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (12), 5 states have call predecessors, (12), 6 states have call successors, (12) [2023-12-02 14:37:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 138 transitions. [2023-12-02 14:37:15,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 14:37:15,582 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:37:15,582 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:37:15,590 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:37:15,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:15,789 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:37:15,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:37:15,790 INFO L85 PathProgramCache]: Analyzing trace with hash 1731278455, now seen corresponding path program 1 times [2023-12-02 14:37:15,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:37:15,790 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016092975] [2023-12-02 14:37:15,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:15,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:37:15,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:16,104 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:16,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:37:16,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016092975] [2023-12-02 14:37:16,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016092975] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:37:16,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852564262] [2023-12-02 14:37:16,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:37:16,104 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:37:16,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:37:16,106 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:37:16,108 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:37:16,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:37:16,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 14:37:16,531 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:37:16,593 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:37:16,593 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:37:16,773 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 14:37:16,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [852564262] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:37:16,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2044633121] [2023-12-02 14:37:16,795 INFO L159 IcfgInterpreter]: Started Sifa with 47 locations of interest [2023-12-02 14:37:16,795 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:37:16,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:37:16,803 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:37:16,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:37:25,301 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 104 for LOIs [2023-12-02 14:37:25,559 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-12-02 14:37:25,564 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 17 for LOIs [2023-12-02 14:37:25,831 INFO L197 IcfgInterpreter]: Interpreting procedure ensure_linked_list_is_allocated with input of size 292 for LOIs [2023-12-02 14:37:27,563 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2023-12-02 14:37:27,565 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 289 for LOIs [2023-12-02 14:37:27,719 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 25 for LOIs [2023-12-02 14:37:27,758 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:37:51,492 WARN L293 SmtUtils]: Spent 5.52s on a formula simplification. DAG size of input: 339 DAG size of output: 291 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:38:44,082 WARN L293 SmtUtils]: Spent 46.01s on a formula simplification. DAG size of input: 427 DAG size of output: 379 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:38:45,413 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4177#(and (<= 0 |__VERIFIER_assert_#in~cond|) (<= 1 |#StackHeapBarrier|) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= ~tl_last_error~0 0) (<= |__VERIFIER_assert_#in~cond| 1))' at error location [2023-12-02 14:38:45,413 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:38:45,414 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:38:45,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 6] total 13 [2023-12-02 14:38:45,414 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402008615] [2023-12-02 14:38:45,414 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:38:45,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 14:38:45,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:38:45,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 14:38:45,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=2311, Unknown=7, NotChecked=0, Total=2550 [2023-12-02 14:38:45,416 INFO L87 Difference]: Start difference. First operand 95 states and 138 transitions. Second operand has 13 states, 8 states have (on average 5.75) internal successors, (46), 9 states have internal predecessors, (46), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) [2023-12-02 14:38:45,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:38:45,689 INFO L93 Difference]: Finished difference Result 176 states and 259 transitions. [2023-12-02 14:38:45,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:38:45,690 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 8 states have (on average 5.75) internal successors, (46), 9 states have internal predecessors, (46), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) Word has length 73 [2023-12-02 14:38:45,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:38:45,691 INFO L225 Difference]: With dead ends: 176 [2023-12-02 14:38:45,691 INFO L226 Difference]: Without dead ends: 98 [2023-12-02 14:38:45,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 167 SyntacticMatches, 6 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 77.8s TimeCoverageRelationStatistics Valid=241, Invalid=2508, Unknown=7, NotChecked=0, Total=2756 [2023-12-02 14:38:45,694 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 3 mSDsluCounter, 955 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 1065 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:38:45,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 1065 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:38:45,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-12-02 14:38:45,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2023-12-02 14:38:45,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 58 states have internal predecessors, (63), 34 states have call successors, (34), 8 states have call predecessors, (34), 11 states have return successors, (47), 32 states have call predecessors, (47), 32 states have call successors, (47) [2023-12-02 14:38:45,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 144 transitions. [2023-12-02 14:38:45,706 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 144 transitions. Word has length 73 [2023-12-02 14:38:45,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:38:45,707 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 144 transitions. [2023-12-02 14:38:45,707 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 8 states have (on average 5.75) internal successors, (46), 9 states have internal predecessors, (46), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) [2023-12-02 14:38:45,707 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 144 transitions. [2023-12-02 14:38:45,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 14:38:45,708 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:38:45,708 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:38:45,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 14:38:45,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:38:45,909 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:38:45,909 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:38:45,909 INFO L85 PathProgramCache]: Analyzing trace with hash 1613719859, now seen corresponding path program 1 times [2023-12-02 14:38:45,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:38:45,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751321925] [2023-12-02 14:38:45,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:45,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:38:45,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:46,114 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:38:46,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:38:46,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751321925] [2023-12-02 14:38:46,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751321925] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:38:46,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432193314] [2023-12-02 14:38:46,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:46,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:46,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:38:46,116 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:38:46,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:38:46,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:46,511 INFO L262 TraceCheckSpWp]: Trace formula consists of 677 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:38:46,513 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:38:46,569 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 14:38:46,569 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:38:46,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432193314] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:38:46,569 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:38:46,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-12-02 14:38:46,570 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049285137] [2023-12-02 14:38:46,570 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:38:46,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:38:46,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:38:46,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:38:46,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:38:46,572 INFO L87 Difference]: Start difference. First operand 97 states and 144 transitions. Second operand has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 14:38:46,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:38:46,867 INFO L93 Difference]: Finished difference Result 180 states and 269 transitions. [2023-12-02 14:38:46,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:38:46,868 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2023-12-02 14:38:46,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:38:46,869 INFO L225 Difference]: With dead ends: 180 [2023-12-02 14:38:46,869 INFO L226 Difference]: Without dead ends: 100 [2023-12-02 14:38:46,870 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:38:46,871 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 48 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 472 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:38:46,871 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 472 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:38:46,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2023-12-02 14:38:46,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2023-12-02 14:38:46,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 61 states have internal predecessors, (65), 34 states have call successors, (34), 8 states have call predecessors, (34), 12 states have return successors, (48), 32 states have call predecessors, (48), 32 states have call successors, (48) [2023-12-02 14:38:46,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 147 transitions. [2023-12-02 14:38:46,883 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 147 transitions. Word has length 75 [2023-12-02 14:38:46,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:38:46,883 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 147 transitions. [2023-12-02 14:38:46,883 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.285714285714286) internal successors, (37), 7 states have internal predecessors, (37), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 14:38:46,884 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 147 transitions. [2023-12-02 14:38:46,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 14:38:46,885 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:38:46,885 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:38:46,892 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:38:47,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 14:38:47,087 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:38:47,087 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:38:47,087 INFO L85 PathProgramCache]: Analyzing trace with hash -1887562295, now seen corresponding path program 1 times [2023-12-02 14:38:47,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:38:47,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238774751] [2023-12-02 14:38:47,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:47,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:38:47,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:47,367 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 14:38:47,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:38:47,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238774751] [2023-12-02 14:38:47,368 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238774751] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:38:47,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020372036] [2023-12-02 14:38:47,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:47,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:47,368 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:38:47,369 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:38:47,375 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:38:47,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:47,749 INFO L262 TraceCheckSpWp]: Trace formula consists of 684 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:38:47,751 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:38:47,830 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 14:38:47,830 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:38:47,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020372036] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:38:47,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:38:47,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-12-02 14:38:47,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976965701] [2023-12-02 14:38:47,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:38:47,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:38:47,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:38:47,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:38:47,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:38:47,832 INFO L87 Difference]: Start difference. First operand 100 states and 147 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 14:38:48,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:38:48,268 INFO L93 Difference]: Finished difference Result 186 states and 274 transitions. [2023-12-02 14:38:48,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 14:38:48,268 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 77 [2023-12-02 14:38:48,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:38:48,270 INFO L225 Difference]: With dead ends: 186 [2023-12-02 14:38:48,270 INFO L226 Difference]: Without dead ends: 103 [2023-12-02 14:38:48,271 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2023-12-02 14:38:48,272 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 67 mSDsluCounter, 458 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 549 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:38:48,272 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 549 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:38:48,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-12-02 14:38:48,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 97. [2023-12-02 14:38:48,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 58 states have internal predecessors, (63), 34 states have call successors, (34), 8 states have call predecessors, (34), 11 states have return successors, (44), 32 states have call predecessors, (44), 32 states have call successors, (44) [2023-12-02 14:38:48,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 141 transitions. [2023-12-02 14:38:48,283 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 141 transitions. Word has length 77 [2023-12-02 14:38:48,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:38:48,284 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 141 transitions. [2023-12-02 14:38:48,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 4 states have call successors, (13), 2 states have call predecessors, (13), 3 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 14:38:48,284 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 141 transitions. [2023-12-02 14:38:48,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 14:38:48,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:38:48,286 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:38:48,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 14:38:48,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:48,487 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:38:48,487 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:38:48,487 INFO L85 PathProgramCache]: Analyzing trace with hash 955551226, now seen corresponding path program 1 times [2023-12-02 14:38:48,487 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:38:48,487 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661184610] [2023-12-02 14:38:48,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:48,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:38:48,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:48,800 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 14:38:48,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:38:48,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661184610] [2023-12-02 14:38:48,801 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661184610] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:38:48,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289926733] [2023-12-02 14:38:48,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:38:48,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:38:48,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:38:48,802 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:38:48,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:38:49,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:38:49,231 INFO L262 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 29 conjunts are in the unsatisfiable core [2023-12-02 14:38:49,234 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:38:49,294 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 14:38:49,294 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:38:49,490 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 14:38:49,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289926733] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:38:49,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [390594565] [2023-12-02 14:38:49,494 INFO L159 IcfgInterpreter]: Started Sifa with 47 locations of interest [2023-12-02 14:38:49,494 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:38:49,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:38:49,495 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:38:49,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:38:57,745 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 104 for LOIs [2023-12-02 14:38:58,030 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-12-02 14:38:58,037 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 17 for LOIs [2023-12-02 14:38:58,457 INFO L197 IcfgInterpreter]: Interpreting procedure ensure_linked_list_is_allocated with input of size 292 for LOIs [2023-12-02 14:39:00,238 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2023-12-02 14:39:00,241 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 289 for LOIs [2023-12-02 14:39:00,368 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 25 for LOIs [2023-12-02 14:39:00,409 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:39:32,816 WARN L293 SmtUtils]: Spent 8.70s on a formula simplification. DAG size of input: 339 DAG size of output: 291 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:40:58,980 WARN L293 SmtUtils]: Spent 1.26m on a formula simplification. DAG size of input: 427 DAG size of output: 379 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:41:00,610 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6427#(and (<= 0 |__VERIFIER_assert_#in~cond|) (<= 1 |#StackHeapBarrier|) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= ~tl_last_error~0 0) (<= |__VERIFIER_assert_#in~cond| 1))' at error location [2023-12-02 14:41:00,610 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:41:00,610 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:41:00,610 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10, 7] total 15 [2023-12-02 14:41:00,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359310125] [2023-12-02 14:41:00,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:41:00,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 14:41:00,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:41:00,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 14:41:00,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2513, Unknown=9, NotChecked=0, Total=2756 [2023-12-02 14:41:00,613 INFO L87 Difference]: Start difference. First operand 97 states and 141 transitions. Second operand has 15 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) [2023-12-02 14:41:00,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:41:00,960 INFO L93 Difference]: Finished difference Result 184 states and 270 transitions. [2023-12-02 14:41:00,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 14:41:00,960 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) Word has length 81 [2023-12-02 14:41:00,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:41:00,962 INFO L225 Difference]: With dead ends: 184 [2023-12-02 14:41:00,962 INFO L226 Difference]: Without dead ends: 104 [2023-12-02 14:41:00,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 190 SyntacticMatches, 6 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 120.4s TimeCoverageRelationStatistics Valid=248, Invalid=2823, Unknown=9, NotChecked=0, Total=3080 [2023-12-02 14:41:00,964 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 5 mSDsluCounter, 1338 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 1453 SdHoareTripleChecker+Invalid, 284 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:41:00,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 1453 Invalid, 284 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:41:00,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-12-02 14:41:00,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 98. [2023-12-02 14:41:00,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 59 states have internal predecessors, (64), 34 states have call successors, (34), 8 states have call predecessors, (34), 11 states have return successors, (44), 32 states have call predecessors, (44), 32 states have call successors, (44) [2023-12-02 14:41:00,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 142 transitions. [2023-12-02 14:41:00,975 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 142 transitions. Word has length 81 [2023-12-02 14:41:00,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:41:00,976 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 142 transitions. [2023-12-02 14:41:00,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 10 states have (on average 4.8) internal successors, (48), 11 states have internal predecessors, (48), 5 states have call successors, (18), 2 states have call predecessors, (18), 7 states have return successors, (21), 6 states have call predecessors, (21), 5 states have call successors, (21) [2023-12-02 14:41:00,976 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 142 transitions. [2023-12-02 14:41:00,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 14:41:00,978 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:41:00,978 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:41:00,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-12-02 14:41:01,179 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:41:01,179 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:41:01,179 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:41:01,180 INFO L85 PathProgramCache]: Analyzing trace with hash 1267541200, now seen corresponding path program 2 times [2023-12-02 14:41:01,180 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:41:01,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072002142] [2023-12-02 14:41:01,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:01,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:41:01,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:41:01,534 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 14:41:01,535 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:41:01,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072002142] [2023-12-02 14:41:01,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072002142] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:41:01,535 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408233191] [2023-12-02 14:41:01,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:41:01,535 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:41:01,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:41:01,536 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:41:01,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:41:03,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:41:03,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:41:03,120 INFO L262 TraceCheckSpWp]: Trace formula consists of 602 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 14:41:03,123 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:41:03,154 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:41:03,154 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:41:03,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408233191] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:41:03,154 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:41:03,154 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 8 [2023-12-02 14:41:03,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944927883] [2023-12-02 14:41:03,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:41:03,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:41:03,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:41:03,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:41:03,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 14:41:03,156 INFO L87 Difference]: Start difference. First operand 98 states and 142 transitions. Second operand has 7 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-12-02 14:41:03,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:41:03,293 INFO L93 Difference]: Finished difference Result 182 states and 267 transitions. [2023-12-02 14:41:03,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 14:41:03,293 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 83 [2023-12-02 14:41:03,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:41:03,294 INFO L225 Difference]: With dead ends: 182 [2023-12-02 14:41:03,294 INFO L226 Difference]: Without dead ends: 101 [2023-12-02 14:41:03,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:41:03,296 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 4 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 621 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:41:03,296 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 621 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:41:03,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-12-02 14:41:03,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2023-12-02 14:41:03,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 50 states have (on average 1.24) internal successors, (62), 56 states have internal predecessors, (62), 34 states have call successors, (34), 8 states have call predecessors, (34), 10 states have return successors, (38), 32 states have call predecessors, (38), 32 states have call successors, (38) [2023-12-02 14:41:03,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 134 transitions. [2023-12-02 14:41:03,306 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 134 transitions. Word has length 83 [2023-12-02 14:41:03,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:41:03,306 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 134 transitions. [2023-12-02 14:41:03,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 8.2) internal successors, (41), 6 states have internal predecessors, (41), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-12-02 14:41:03,306 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 134 transitions. [2023-12-02 14:41:03,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2023-12-02 14:41:03,308 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:41:03,308 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:41:03,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 14:41:03,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:41:03,509 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:41:03,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:41:03,509 INFO L85 PathProgramCache]: Analyzing trace with hash -915351603, now seen corresponding path program 2 times [2023-12-02 14:41:03,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:41:03,510 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061958653] [2023-12-02 14:41:03,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:03,510 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:41:03,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:41:04,631 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 14:41:04,632 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:41:04,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061958653] [2023-12-02 14:41:04,632 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061958653] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:41:04,632 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257314375] [2023-12-02 14:41:04,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:41:04,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:41:04,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:41:04,634 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:41:04,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:41:05,862 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:41:05,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:41:05,867 INFO L262 TraceCheckSpWp]: Trace formula consists of 605 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 14:41:05,871 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:41:05,974 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 17 [2023-12-02 14:41:05,983 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2023-12-02 14:41:07,010 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:41:07,011 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:41:07,011 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257314375] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:41:07,011 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:41:07,011 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11] total 21 [2023-12-02 14:41:07,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106937232] [2023-12-02 14:41:07,011 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:41:07,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-12-02 14:41:07,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:41:07,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-12-02 14:41:07,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=369, Unknown=0, NotChecked=0, Total=420 [2023-12-02 14:41:07,012 INFO L87 Difference]: Start difference. First operand 95 states and 134 transitions. Second operand has 12 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 7 states have call successors, (15), 3 states have call predecessors, (15), 5 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) [2023-12-02 14:41:08,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:41:08,339 INFO L93 Difference]: Finished difference Result 220 states and 303 transitions. [2023-12-02 14:41:08,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-12-02 14:41:08,339 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 7 states have call successors, (15), 3 states have call predecessors, (15), 5 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) Word has length 84 [2023-12-02 14:41:08,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:41:08,342 INFO L225 Difference]: With dead ends: 220 [2023-12-02 14:41:08,342 INFO L226 Difference]: Without dead ends: 139 [2023-12-02 14:41:08,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 68 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=91, Invalid=611, Unknown=0, NotChecked=0, Total=702 [2023-12-02 14:41:08,344 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 46 mSDsluCounter, 656 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 750 SdHoareTripleChecker+Invalid, 398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:41:08,344 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 750 Invalid, 398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 14:41:08,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2023-12-02 14:41:08,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 137. [2023-12-02 14:41:08,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 74 states have (on average 1.1891891891891893) internal successors, (88), 81 states have internal predecessors, (88), 46 states have call successors, (46), 15 states have call predecessors, (46), 16 states have return successors, (53), 42 states have call predecessors, (53), 44 states have call successors, (53) [2023-12-02 14:41:08,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 187 transitions. [2023-12-02 14:41:08,359 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 187 transitions. Word has length 84 [2023-12-02 14:41:08,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:41:08,359 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 187 transitions. [2023-12-02 14:41:08,359 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 4.0) internal successors, (36), 10 states have internal predecessors, (36), 7 states have call successors, (15), 3 states have call predecessors, (15), 5 states have return successors, (14), 9 states have call predecessors, (14), 7 states have call successors, (14) [2023-12-02 14:41:08,360 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 187 transitions. [2023-12-02 14:41:08,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 14:41:08,361 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:41:08,361 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:41:08,370 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:41:08,561 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 14:41:08,561 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:41:08,562 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:41:08,562 INFO L85 PathProgramCache]: Analyzing trace with hash 1866155889, now seen corresponding path program 1 times [2023-12-02 14:41:08,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:41:08,562 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079171505] [2023-12-02 14:41:08,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:08,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:41:08,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:41:09,653 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 14:41:09,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:41:09,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079171505] [2023-12-02 14:41:09,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079171505] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:41:09,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408509920] [2023-12-02 14:41:09,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:41:09,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:41:09,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:41:09,655 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:41:09,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:41:10,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:41:10,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 810 conjuncts, 102 conjunts are in the unsatisfiable core [2023-12-02 14:41:10,152 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:41:10,162 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 5 [2023-12-02 14:41:10,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:41:10,170 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 1 [2023-12-02 14:41:10,206 INFO L378 Elim1Store]: Elim1 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 5 treesize of output 3 [2023-12-02 14:41:10,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:41:10,319 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-12-02 14:41:10,436 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 34 [2023-12-02 14:41:10,447 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 25 [2023-12-02 14:41:10,450 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-12-02 14:41:10,462 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 9 [2023-12-02 14:41:10,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:41:10,468 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 1 [2023-12-02 14:41:10,508 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-12-02 14:41:10,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-12-02 14:41:12,579 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56| Int)) (and (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|) 24) |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|)) (<= 2 |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|))) is different from true [2023-12-02 14:41:14,837 WARN L876 $PredicateComparison]: unable to prove that (and (exists ((|v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_57| Int)) (and (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_57|) 24) |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_57|)) (<= 2 |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_57|))) (exists ((|v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56| Int)) (and (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|) 24) |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|)) (<= 2 |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_56|)))) is different from true [2023-12-02 14:41:17,025 WARN L876 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_58| Int)) (and (not (= |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_58| (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_58|) 24))) (<= 2 |v_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base_BEFORE_CALL_58|))) is different from true [2023-12-02 14:41:22,611 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 22 proven. 23 refuted. 0 times theorem prover too weak. 4 trivial. 16 not checked. [2023-12-02 14:41:22,611 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:41:24,776 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_aws_linked_list_empty_~list.base_15 Int)) (or (< v_aws_linked_list_empty_~list.base_15 |c_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base|) (forall ((v_aws_linked_list_empty_~list.offset_15 Int)) (or (= (select (select |c_#memory_$Pointer$.base| v_aws_linked_list_empty_~list.base_15) v_aws_linked_list_empty_~list.offset_15) v_aws_linked_list_empty_~list.base_15) (< v_aws_linked_list_empty_~list.offset_15 |c_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.offset|))))) (forall ((v_aws_linked_list_empty_~list.base_15 Int)) (or (< v_aws_linked_list_empty_~list.base_15 |c_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.base|) (forall ((v_aws_linked_list_empty_~list.offset_15 Int)) (or (= (+ v_aws_linked_list_empty_~list.offset_15 16) (select (select |c_#memory_$Pointer$.offset| v_aws_linked_list_empty_~list.base_15) v_aws_linked_list_empty_~list.offset_15)) (< v_aws_linked_list_empty_~list.offset_15 |c_ULTIMATE.start_aws_linked_list_swap_contents_~b#1.offset|)))))) is different from false [2023-12-02 14:41:24,779 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408509920] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:41:24,779 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1616351039] [2023-12-02 14:41:24,781 INFO L159 IcfgInterpreter]: Started Sifa with 47 locations of interest [2023-12-02 14:41:24,781 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:41:24,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:41:24,782 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:41:24,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:41:32,682 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 104 for LOIs [2023-12-02 14:41:33,125 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-12-02 14:41:33,132 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 17 for LOIs [2023-12-02 14:41:33,414 INFO L197 IcfgInterpreter]: Interpreting procedure ensure_linked_list_is_allocated with input of size 327 for LOIs [2023-12-02 14:41:35,243 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2023-12-02 14:41:35,246 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 324 for LOIs [2023-12-02 14:41:35,373 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 25 for LOIs [2023-12-02 14:41:35,405 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:41:58,892 WARN L876 $PredicateComparison]: unable to prove that (let ((.cse0 (+ c_ensure_linked_list_is_allocated_~list.offset 24))) (and (exists ((|v_#memory_real_59| (Array Int (Array Int Real))) (|v_#memory_real_371| (Array Int (Array Int Real)))) (and (= |v_#memory_real_59| (store |v_#memory_real_371| c_ensure_linked_list_is_allocated_~curr~0.base (store (select |v_#memory_real_371| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset (select (select |v_#memory_real_59| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset)))) (= |c_#memory_real| (store |v_#memory_real_59| c_ensure_linked_list_is_allocated_~list.base (store (select |v_#memory_real_59| c_ensure_linked_list_is_allocated_~list.base) .cse0 (select (select |c_#memory_real| c_ensure_linked_list_is_allocated_~list.base) .cse0)))))) (exists ((|v_#memory_$Pointer$.offset_139| (Array Int (Array Int Int)))) (= (let ((.cse1 (store |v_#memory_$Pointer$.offset_139| c_ensure_linked_list_is_allocated_~curr~0.base (store (select |v_#memory_$Pointer$.offset_139| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset (+ 16 c_ensure_linked_list_is_allocated_~list.offset))))) (store .cse1 c_ensure_linked_list_is_allocated_~list.base (store (select .cse1 c_ensure_linked_list_is_allocated_~list.base) .cse0 c_ensure_linked_list_is_allocated_~curr~0.offset))) |c_#memory_$Pointer$.offset|)) (exists ((v_ensure_linked_list_is_allocated_~i~1_39 Int) (v_ensure_linked_list_is_allocated_~node~0.offset_23 Int)) (let ((.cse13 (= v_ensure_linked_list_is_allocated_~node~0.offset_23 0)) (.cse2 (= c_ensure_linked_list_is_allocated_~curr~0.offset 0)) (.cse3 (= c_ensure_linked_list_is_allocated_~list.offset 0)) (.cse4 (= |c_~#s_can_fail_allocator_static~0.base| 4)) (.cse5 (= |c_ensure_linked_list_is_allocated_#in~max_length| 20)) (.cse7 (= c_~tl_last_error~0 0)) (.cse10 (= |c_ensure_linked_list_is_allocated_#in~list.offset| 0)) (.cse11 (= c_ensure_linked_list_is_allocated_~max_length 20)) (.cse12 (= |c_~#s_can_fail_allocator_static~0.offset| 0))) (and (let ((.cse6 (<= 1 |c_#StackHeapBarrier|)) (.cse8 (<= 2 c_ensure_linked_list_is_allocated_~list.base)) (.cse9 (<= 2 |c_ensure_linked_list_is_allocated_#in~list.base|))) (or (and (<= 0 v_ensure_linked_list_is_allocated_~i~1_39) .cse2 .cse3 .cse4 .cse5 .cse6 .cse7 .cse8 .cse9 .cse10 .cse11 .cse12) (and .cse13 .cse2 .cse3 .cse4 .cse5 .cse6 .cse7 .cse8 .cse9 .cse10 .cse11 .cse12 (<= 1 v_ensure_linked_list_is_allocated_~i~1_39)))) (or (and .cse2 .cse3 .cse4 .cse5 .cse7 .cse10 .cse11 .cse12) (and .cse13 .cse2 .cse3 .cse4 .cse5 .cse7 .cse10 .cse11 .cse12 (= v_ensure_linked_list_is_allocated_~i~1_39 1))) (<= (mod c_ensure_linked_list_is_allocated_~length~1 18446744073709551616) (mod v_ensure_linked_list_is_allocated_~i~1_39 18446744073709551616))))) (exists ((|v_#memory_int_62| (Array Int (Array Int Int))) (|v_#memory_int_374| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_374| c_ensure_linked_list_is_allocated_~curr~0.base (store (select |v_#memory_int_374| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset (select (select |v_#memory_int_62| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset))) |v_#memory_int_62|) (= (store |v_#memory_int_62| c_ensure_linked_list_is_allocated_~list.base (store (select |v_#memory_int_62| c_ensure_linked_list_is_allocated_~list.base) .cse0 (select (select |c_#memory_int| c_ensure_linked_list_is_allocated_~list.base) .cse0))) |c_#memory_int|))) (exists ((|v_#memory_$Pointer$.base_140| (Array Int (Array Int Int)))) (= |c_#memory_$Pointer$.base| (let ((.cse14 (store |v_#memory_$Pointer$.base_140| c_ensure_linked_list_is_allocated_~curr~0.base (store (select |v_#memory_$Pointer$.base_140| c_ensure_linked_list_is_allocated_~curr~0.base) c_ensure_linked_list_is_allocated_~curr~0.offset c_ensure_linked_list_is_allocated_~list.base)))) (store .cse14 c_ensure_linked_list_is_allocated_~list.base (store (select .cse14 c_ensure_linked_list_is_allocated_~list.base) .cse0 c_ensure_linked_list_is_allocated_~curr~0.base))))))) is different from true [2023-12-02 14:42:36,807 WARN L293 SmtUtils]: Spent 8.43s on a formula simplification. DAG size of input: 339 DAG size of output: 291 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:44:17,433 WARN L293 SmtUtils]: Spent 1.44m on a formula simplification. DAG size of input: 427 DAG size of output: 379 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:44:19,388 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8675#(and (<= 0 |__VERIFIER_assert_#in~cond|) (<= 1 |#StackHeapBarrier|) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= ~tl_last_error~0 0) (<= |__VERIFIER_assert_#in~cond| 1))' at error location [2023-12-02 14:44:19,389 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:44:19,389 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:44:19,389 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 28] total 37 [2023-12-02 14:44:19,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361505396] [2023-12-02 14:44:19,389 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 14:44:19,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 14:44:19,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:44:19,391 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 14:44:19,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=373, Invalid=4821, Unknown=82, NotChecked=730, Total=6006 [2023-12-02 14:44:19,395 INFO L87 Difference]: Start difference. First operand 137 states and 187 transitions. Second operand has 37 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 15 states have call successors, (29), 8 states have call predecessors, (29), 11 states have return successors, (28), 14 states have call predecessors, (28), 15 states have call successors, (28) [2023-12-02 14:44:21,804 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:24,755 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:28,842 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:30,867 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:36,958 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:38,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:40,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:49,108 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:51,125 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:53,139 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:55,163 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:57,190 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:44:59,194 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:01,244 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:03,258 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:05,267 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:07,284 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:09,291 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:11,303 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:14,304 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:20,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:22,424 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:24,455 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:26,470 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:28,479 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:34,608 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:36,624 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:38,650 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:40,670 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:42,737 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:45:46,852 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:45,165 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:47,183 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:49,210 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:51,229 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:53,266 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:55,273 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:57,277 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:47:59,281 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:01,283 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:03,287 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:05,294 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:07,297 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:09,300 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:11,310 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:13,316 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:15,437 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:17,441 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:19,443 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:21,448 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:23,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:25,453 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:27,457 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:29,462 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:31,464 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:33,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:35,472 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:37,474 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:39,477 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:41,481 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:43,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:45,514 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:47,520 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:48:49,530 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:00,334 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:02,338 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:04,347 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:06,349 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:08,364 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:10,369 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:12,376 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:14,378 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:38,534 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:40,536 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:42,906 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:45,234 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:48,319 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:57,289 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:49:59,314 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:00,998 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:03,035 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:06,577 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:08,647 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:10,852 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:13,065 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 14:50:13,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:50:13,086 INFO L93 Difference]: Finished difference Result 394 states and 613 transitions. [2023-12-02 14:50:13,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2023-12-02 14:50:13,087 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 15 states have call successors, (29), 8 states have call predecessors, (29), 11 states have return successors, (28), 14 states have call predecessors, (28), 15 states have call successors, (28) Word has length 86 [2023-12-02 14:50:13,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:50:13,090 INFO L225 Difference]: With dead ends: 394 [2023-12-02 14:50:13,090 INFO L226 Difference]: Without dead ends: 305 [2023-12-02 14:50:13,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 121 SyntacticMatches, 12 SemanticMatches, 115 ConstructedPredicates, 5 IntricatePredicates, 1 DeprecatedPredicates, 4067 ImplicationChecksByTransitivity, 346.4s TimeCoverageRelationStatistics Valid=898, Invalid=11434, Unknown=120, NotChecked=1120, Total=13572 [2023-12-02 14:50:13,098 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 482 mSDsluCounter, 1257 mSDsCounter, 0 mSdLazyCounter, 4560 mSolverCounterSat, 466 mSolverCounterUnsat, 135 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 183.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 1351 SdHoareTripleChecker+Invalid, 6312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 466 IncrementalHoareTripleChecker+Valid, 4560 IncrementalHoareTripleChecker+Invalid, 135 IncrementalHoareTripleChecker+Unknown, 1151 IncrementalHoareTripleChecker+Unchecked, 184.6s IncrementalHoareTripleChecker+Time [2023-12-02 14:50:13,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [488 Valid, 1351 Invalid, 6312 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [466 Valid, 4560 Invalid, 135 Unknown, 1151 Unchecked, 184.6s Time] [2023-12-02 14:50:13,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2023-12-02 14:50:13,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 206. [2023-12-02 14:50:13,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 116 states have (on average 1.1896551724137931) internal successors, (138), 127 states have internal predecessors, (138), 66 states have call successors, (66), 18 states have call predecessors, (66), 23 states have return successors, (90), 63 states have call predecessors, (90), 64 states have call successors, (90) [2023-12-02 14:50:13,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 294 transitions. [2023-12-02 14:50:13,143 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 294 transitions. Word has length 86 [2023-12-02 14:50:13,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:50:13,143 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 294 transitions. [2023-12-02 14:50:13,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 15 states have call successors, (29), 8 states have call predecessors, (29), 11 states have return successors, (28), 14 states have call predecessors, (28), 15 states have call successors, (28) [2023-12-02 14:50:13,144 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 294 transitions. [2023-12-02 14:50:13,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 14:50:13,145 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:50:13,146 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2023-12-02 14:50:13,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:50:13,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 14:50:13,346 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:50:13,347 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:50:13,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1833335859, now seen corresponding path program 1 times [2023-12-02 14:50:13,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:50:13,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134419575] [2023-12-02 14:50:13,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:13,347 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:50:13,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:15,616 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 14:50:15,617 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:50:15,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134419575] [2023-12-02 14:50:15,617 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134419575] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:50:15,617 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423024212] [2023-12-02 14:50:15,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:50:15,617 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:50:15,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:50:15,620 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:50:15,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f08c5292-5872-49a0-8834-d0a210e0ab5f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:50:16,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:50:16,106 INFO L262 TraceCheckSpWp]: Trace formula consists of 878 conjuncts, 61 conjunts are in the unsatisfiable core [2023-12-02 14:50:16,111 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:50:16,169 INFO L378 Elim1Store]: Elim1 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 16 [2023-12-02 14:50:16,186 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 14:50:16,186 INFO L378 Elim1Store]: Elim1 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 16 treesize of output 15 [2023-12-02 14:50:16,211 INFO L378 Elim1Store]: Elim1 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 5 treesize of output 3 [2023-12-02 14:50:16,286 INFO L349 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2023-12-02 14:50:16,286 INFO L378 Elim1Store]: Elim1 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 50 [2023-12-02 14:50:16,305 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 14:50:16,305 INFO L378 Elim1Store]: Elim1 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 24 treesize of output 23 [2023-12-02 14:50:16,382 INFO L378 Elim1Store]: Elim1 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 19 treesize of output 1 [2023-12-02 14:50:16,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 14:50:16,388 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 11 [2023-12-02 14:50:16,944 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 57 proven. 5 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:50:16,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:50:17,439 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:17,439 INFO L378 Elim1Store]: Elim1 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 46 treesize of output 39 [2023-12-02 14:50:17,461 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:17,461 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1999 treesize of output 1949 [2023-12-02 14:50:17,482 INFO L378 Elim1Store]: Elim1 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 336 treesize of output 328 [2023-12-02 14:50:17,496 INFO L378 Elim1Store]: Elim1 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 432 treesize of output 416 [2023-12-02 14:50:17,660 INFO L378 Elim1Store]: Elim1 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 6 treesize of output 4 [2023-12-02 14:50:17,714 INFO L378 Elim1Store]: Elim1 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 6 treesize of output 4 [2023-12-02 14:50:17,911 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:17,912 INFO L378 Elim1Store]: Elim1 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 49 [2023-12-02 14:50:18,053 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:18,053 INFO L378 Elim1Store]: Elim1 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 63 [2023-12-02 14:50:18,061 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:50:18,062 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:50:18,063 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:50:18,073 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 14:50:18,105 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:18,106 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 3171 treesize of output 3043 [2023-12-02 14:50:18,159 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 778 treesize of output 762 [2023-12-02 14:50:18,184 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 888 treesize of output 880 [2023-12-02 14:50:18,728 INFO L378 Elim1Store]: Elim1 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 6 treesize of output 4 [2023-12-02 14:50:18,756 INFO L378 Elim1Store]: Elim1 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 6 treesize of output 4 [2023-12-02 14:50:18,763 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:18,763 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 23 [2023-12-02 14:50:18,777 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 14:50:18,777 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 61 treesize of output 63 [2023-12-02 14:50:18,952 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 28 proven. 7 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2023-12-02 14:50:18,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423024212] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:50:18,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963750011] [2023-12-02 14:50:18,955 INFO L159 IcfgInterpreter]: Started Sifa with 51 locations of interest [2023-12-02 14:50:18,955 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:50:18,956 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:50:18,956 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:50:18,956 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:50:23,425 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_init with input of size 327 for LOIs [2023-12-02 14:50:31,345 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 400 for LOIs [2023-12-02 14:50:35,115 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 104 for LOIs [2023-12-02 14:50:35,344 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 17 for LOIs [2023-12-02 14:50:35,592 INFO L197 IcfgInterpreter]: Interpreting procedure ensure_linked_list_is_allocated with input of size 327 for LOIs [2023-12-02 14:50:38,338 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2023-12-02 14:50:38,340 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 324 for LOIs [2023-12-02 14:50:38,446 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 25 for LOIs [2023-12-02 14:50:38,478 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:51:17,909 WARN L293 SmtUtils]: Spent 34.82s on a formula simplification. DAG size of input: 404 DAG size of output: 351 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)