./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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 f57bc64edf303a057c8eafb48480d4e5b764bd411481261d53eb2a101eb82ae8 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:43:28,574 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:43:28,657 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-12-02 16:43:28,661 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:43:28,662 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:43:28,683 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:43:28,684 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:43:28,684 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:43:28,685 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:43:28,686 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:43:28,686 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:43:28,687 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:43:28,687 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:43:28,688 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 16:43:28,688 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:43:28,689 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:43:28,689 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 16:43:28,690 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 16:43:28,690 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:43:28,691 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 16:43:28,691 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 16:43:28,693 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 16:43:28,694 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:43:28,694 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:43:28,695 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 16:43:28,695 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:43:28,695 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:43:28,696 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:43:28,696 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:43:28,696 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:43:28,697 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:43:28,697 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:43:28,697 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:43:28,698 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:43:28,698 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:43:28,698 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:43:28,698 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:43:28,698 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:43:28,698 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 16:43:28,699 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 16:43:28,699 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:43:28,699 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:43:28,699 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:43:28,699 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:43:28,700 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f57bc64edf303a057c8eafb48480d4e5b764bd411481261d53eb2a101eb82ae8 [2023-12-02 16:43:28,946 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:43:28,964 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:43:28,966 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:43:28,967 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:43:28,968 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:43:28,969 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i [2023-12-02 16:43:31,615 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:43:32,007 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:43:32,007 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i [2023-12-02 16:43:32,039 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/efc13122d/f49c380d513a4c66a0a78d9649d0aa22/FLAGf162e1626 [2023-12-02 16:43:32,053 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/efc13122d/f49c380d513a4c66a0a78d9649d0aa22 [2023-12-02 16:43:32,056 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:43:32,057 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:43:32,059 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:43:32,059 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:43:32,064 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:43:32,065 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:43:32" (1/1) ... [2023-12-02 16:43:32,066 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23ac180d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:32, skipping insertion in model container [2023-12-02 16:43:32,066 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:43:32" (1/1) ... [2023-12-02 16:43:32,164 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:43:32,475 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4494,4507] [2023-12-02 16:43:32,482 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4554,4567] [2023-12-02 16:43:33,156 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,157 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,158 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,159 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,160 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,174 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,175 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,177 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,178 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,180 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,181 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,182 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,182 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,474 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 16:43:33,476 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 16:43:33,477 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 16:43:33,478 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 16:43:33,480 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 16:43:33,481 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 16:43:33,481 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 16:43:33,482 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 16:43:33,483 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 16:43:33,484 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 16:43:33,634 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:43:33,653 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:43:33,669 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4494,4507] [2023-12-02 16:43:33,669 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4554,4567] [2023-12-02 16:43:33,714 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,715 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,716 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,716 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,717 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,728 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,729 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,730 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,731 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,732 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,733 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,733 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,734 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:43:33,775 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 16:43:33,776 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 16:43:33,777 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 16:43:33,778 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 16:43:33,780 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 16:43:33,780 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 16:43:33,781 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 16:43:33,781 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 16:43:33,782 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 16:43:33,783 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 16:43:33,824 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:43:34,008 WARN L675 CHandler]: The function __atomic_fetch_or is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,008 WARN L675 CHandler]: The function __atomic_fetch_sub is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,008 WARN L675 CHandler]: The function __atomic_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,008 WARN L675 CHandler]: The function __atomic_fetch_xor is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,008 WARN L675 CHandler]: The function htons is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function ntohl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function __atomic_compare_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function __atomic_fetch_add is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function htonl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function __atomic_store_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function ntohs is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,009 WARN L675 CHandler]: The function __atomic_load_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,010 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,010 WARN L675 CHandler]: The function __atomic_thread_fence is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,010 WARN L675 CHandler]: The function __atomic_fetch_and is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,010 WARN L675 CHandler]: The function aws_array_list_ensure_capacity is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:43:34,016 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:43:34,016 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34 WrapperNode [2023-12-02 16:43:34,016 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:43:34,017 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:43:34,017 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:43:34,017 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:43:34,023 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,100 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,137 INFO L138 Inliner]: procedures = 678, calls = 1045, calls flagged for inlining = 50, calls inlined = 5, statements flattened = 133 [2023-12-02 16:43:34,138 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:43:34,138 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:43:34,138 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:43:34,139 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:43:34,146 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,146 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,150 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,151 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,166 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,170 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,174 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,177 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,183 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:43:34,184 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:43:34,184 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:43:34,184 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:43:34,185 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (1/1) ... [2023-12-02 16:43:34,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:43:34,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:34,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:43:34,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:43:34,256 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_back [2023-12-02 16:43:34,256 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_back [2023-12-02 16:43:34,256 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 16:43:34,256 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 16:43:34,256 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 16:43:34,256 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2023-12-02 16:43:34,256 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2023-12-02 16:43:34,257 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:43:34,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:43:34,257 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_empty [2023-12-02 16:43:34,257 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_empty [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 16:43:34,258 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2023-12-02 16:43:34,258 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2023-12-02 16:43:34,258 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_prev_is_valid [2023-12-02 16:43:34,259 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_prev_is_valid [2023-12-02 16:43:34,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 16:43:34,458 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:43:34,460 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:43:34,716 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:43:34,837 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:43:34,837 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 16:43:34,839 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:43:34 BoogieIcfgContainer [2023-12-02 16:43:34,839 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:43:34,842 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:43:34,842 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:43:34,846 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:43:34,846 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:43:32" (1/3) ... [2023-12-02 16:43:34,847 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a5bdd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:43:34, skipping insertion in model container [2023-12-02 16:43:34,847 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:43:34" (2/3) ... [2023-12-02 16:43:34,847 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a5bdd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:43:34, skipping insertion in model container [2023-12-02 16:43:34,847 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:43:34" (3/3) ... [2023-12-02 16:43:34,849 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_back_harness.i [2023-12-02 16:43:34,868 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:43:34,869 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:43:34,920 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:43:34,927 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;@176fce1c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:43:34,927 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:43:34,932 INFO L276 IsEmpty]: Start isEmpty. Operand has 69 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-12-02 16:43:34,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 16:43:34,942 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:34,943 INFO L195 NwaCegarLoop]: trace histogram [6, 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] [2023-12-02 16:43:34,944 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:34,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:34,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1621271221, now seen corresponding path program 1 times [2023-12-02 16:43:34,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:34,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300371224] [2023-12-02 16:43:34,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:34,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:35,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:35,575 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 16:43:35,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:35,576 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300371224] [2023-12-02 16:43:35,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300371224] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:35,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10345737] [2023-12-02 16:43:35,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:35,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:35,578 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:35,583 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:35,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 16:43:35,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:35,817 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 72 conjunts are in the unsatisfiable core [2023-12-02 16:43:35,830 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:36,002 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 14 treesize of output 15 [2023-12-02 16:43:36,014 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 14 treesize of output 15 [2023-12-02 16:43:36,103 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 28 [2023-12-02 16:43:36,122 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 21 [2023-12-02 16:43:39,308 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:43:39,309 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:43:39,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10345737] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:43:39,309 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:43:39,309 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5] total 13 [2023-12-02 16:43:39,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669323838] [2023-12-02 16:43:39,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:43:39,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 16:43:39,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:43:39,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 16:43:39,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2023-12-02 16:43:39,347 INFO L87 Difference]: Start difference. First operand has 69 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 16:43:40,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:43:40,199 INFO L93 Difference]: Finished difference Result 188 states and 265 transitions. [2023-12-02 16:43:40,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:43:40,201 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2023-12-02 16:43:40,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:43:40,210 INFO L225 Difference]: With dead ends: 188 [2023-12-02 16:43:40,211 INFO L226 Difference]: Without dead ends: 127 [2023-12-02 16:43:40,214 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:43:40,218 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 56 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 16:43:40,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 355 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 16:43:40,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-12-02 16:43:40,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2023-12-02 16:43:40,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 63 states have (on average 1.2063492063492063) internal successors, (76), 65 states have internal predecessors, (76), 46 states have call successors, (46), 15 states have call predecessors, (46), 15 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-12-02 16:43:40,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 166 transitions. [2023-12-02 16:43:40,281 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 166 transitions. Word has length 52 [2023-12-02 16:43:40,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:43:40,282 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 166 transitions. [2023-12-02 16:43:40,282 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 16:43:40,282 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 166 transitions. [2023-12-02 16:43:40,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 16:43:40,285 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:43:40,286 INFO L195 NwaCegarLoop]: trace histogram [6, 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 16:43:40,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:43:40,492 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 16:43:40,492 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:43:40,492 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:43:40,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1217369272, now seen corresponding path program 1 times [2023-12-02 16:43:40,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:43:40,493 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357445451] [2023-12-02 16:43:40,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:40,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:43:40,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:40,796 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 16:43:40,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:43:40,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357445451] [2023-12-02 16:43:40,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357445451] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:40,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653098315] [2023-12-02 16:43:40,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:43:40,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:43:40,798 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:43:40,799 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:43:40,803 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 16:43:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:43:40,998 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 16:43:41,006 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:43:41,020 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:43:41,159 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 14 treesize of output 15 [2023-12-02 16:43:41,175 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 14 treesize of output 15 [2023-12-02 16:43:41,250 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:43:41,250 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 11 treesize of output 11 [2023-12-02 16:43:41,256 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 36 [2023-12-02 16:43:41,261 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 23 treesize of output 16 [2023-12-02 16:43:41,272 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 36 [2023-12-02 16:43:41,277 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 30 treesize of output 21 [2023-12-02 16:43:41,377 INFO L349 Elim1Store]: treesize reduction 96, result has 23.2 percent of original size [2023-12-02 16:43:41,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 107 treesize of output 74 [2023-12-02 16:43:41,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:43:41,399 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 37 treesize of output 32 [2023-12-02 16:43:41,404 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2023-12-02 16:43:43,981 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 16:43:43,981 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:43:47,381 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse5 (+ 16 |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset|)) (.cse1 (+ |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset| 24)) (.cse3 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|)) (.cse7 (+ 8 |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset|))) (and (or (forall ((v_ArrVal_191 (Array Int Int)) (v_ArrVal_189 Int)) (not (= (select (select (let ((.cse0 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_191))) (store .cse0 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse0 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_189))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset|) 0))) (forall ((|ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| Int)) (not (= (select (select (let ((.cse2 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse3 |ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|)))) (store .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset|) 0)))) (forall ((v_ArrVal_191 (Array Int Int)) (v_ArrVal_189 Int)) (= (select (select (let ((.cse4 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_191))) (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_189))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse5) 0)) (forall ((v_ArrVal_191 (Array Int Int)) (v_ArrVal_189 Int)) (= (select (select (let ((.cse6 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_191))) (store .cse6 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse6 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_189))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse7) 0)) (forall ((|ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| Int)) (= (select (select (let ((.cse8 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse3 |ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|)))) (store .cse8 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse8 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse5) 0)) (let ((.cse10 (+ |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset| 24))) (or (forall ((v_ArrVal_191 (Array Int Int)) (v_ArrVal_189 Int)) (not (= (select (select (let ((.cse9 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_191))) (store .cse9 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse9 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_189))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse10) 0))) (forall ((|ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| Int)) (not (= 0 (select (select (let ((.cse11 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse3 |ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|)))) (store .cse11 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse11 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse10)))))) (forall ((|ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| Int)) (= 0 (select (select (let ((.cse12 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse3 |ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|)))) (store .cse12 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse12 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|))) |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base|) .cse7))) (or (not (= |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.base| 0)) (not (= |c_ULTIMATE.start_aws_linked_list_back_harness_~#list~0#1.offset| 0))))) is different from false [2023-12-02 16:43:47,555 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:47,556 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 4 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 364 treesize of output 449 [2023-12-02 16:43:48,536 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 4 [2023-12-02 16:43:48,551 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2023-12-02 16:43:48,571 INFO L349 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2023-12-02 16:43:48,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 21 treesize of output 4 [2023-12-02 16:43:48,586 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 20 treesize of output 18 [2023-12-02 16:43:48,595 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 20 treesize of output 18 [2023-12-02 16:43:48,603 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 20 treesize of output 18 [2023-12-02 16:43:48,704 INFO L349 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2023-12-02 16:43:48,705 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 236 treesize of output 201 [2023-12-02 16:43:48,794 INFO L349 Elim1Store]: treesize reduction 72, result has 17.2 percent of original size [2023-12-02 16:43:48,794 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 7 case distinctions, treesize of input 130 treesize of output 121 [2023-12-02 16:43:48,837 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:48,869 INFO L349 Elim1Store]: treesize reduction 43, result has 12.2 percent of original size [2023-12-02 16:43:48,869 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 2 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 78 treesize of output 73 [2023-12-02 16:43:48,949 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 18 [2023-12-02 16:43:49,669 INFO L349 Elim1Store]: treesize reduction 90, result has 44.8 percent of original size [2023-12-02 16:43:49,670 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 250 treesize of output 239 [2023-12-02 16:43:49,706 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:49,707 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 183 treesize of output 181 [2023-12-02 16:43:49,724 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 132 treesize of output 120 [2023-12-02 16:43:49,821 INFO L349 Elim1Store]: treesize reduction 90, result has 44.8 percent of original size [2023-12-02 16:43:49,821 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 120 treesize of output 151 [2023-12-02 16:43:49,872 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:49,873 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 392 treesize of output 350 [2023-12-02 16:43:49,910 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:49,910 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 172 treesize of output 168 [2023-12-02 16:43:50,405 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 8 treesize of output 4 [2023-12-02 16:43:50,422 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 8 treesize of output 4 [2023-12-02 16:43:50,465 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,466 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 56 [2023-12-02 16:43:50,513 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,513 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 77 [2023-12-02 16:43:50,642 INFO L349 Elim1Store]: treesize reduction 86, result has 45.2 percent of original size [2023-12-02 16:43:50,643 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 116 treesize of output 144 [2023-12-02 16:43:50,657 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,658 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 174 treesize of output 172 [2023-12-02 16:43:50,670 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 132 treesize of output 120 [2023-12-02 16:43:50,759 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 7 treesize of output 3 [2023-12-02 16:43:50,825 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,826 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 49 treesize of output 55 [2023-12-02 16:43:50,883 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:50,941 INFO L349 Elim1Store]: treesize reduction 106, result has 32.5 percent of original size [2023-12-02 16:43:50,941 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 80 [2023-12-02 16:43:50,956 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,956 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 116 treesize of output 104 [2023-12-02 16:43:50,971 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:50,972 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 65 treesize of output 69 [2023-12-02 16:43:51,013 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 8 treesize of output 4 [2023-12-02 16:43:51,044 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,044 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 70 [2023-12-02 16:43:51,085 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:51,139 INFO L349 Elim1Store]: treesize reduction 108, result has 32.1 percent of original size [2023-12-02 16:43:51,140 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 80 [2023-12-02 16:43:51,154 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,154 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 116 treesize of output 104 [2023-12-02 16:43:51,168 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,168 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 65 treesize of output 69 [2023-12-02 16:43:51,207 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 8 treesize of output 4 [2023-12-02 16:43:51,236 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,237 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 70 [2023-12-02 16:43:51,279 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:51,391 INFO L349 Elim1Store]: treesize reduction 87, result has 40.8 percent of original size [2023-12-02 16:43:51,391 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 52 treesize of output 90 [2023-12-02 16:43:51,418 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,419 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 100 treesize of output 100 [2023-12-02 16:43:51,430 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 59 treesize of output 57 [2023-12-02 16:43:51,436 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:51,501 INFO L349 Elim1Store]: treesize reduction 87, result has 40.8 percent of original size [2023-12-02 16:43:51,501 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 52 treesize of output 90 [2023-12-02 16:43:51,525 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,526 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 198 treesize of output 182 [2023-12-02 16:43:51,545 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,545 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 74 treesize of output 78 [2023-12-02 16:43:51,637 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 16:43:51,654 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,654 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 44 treesize of output 54 [2023-12-02 16:43:51,715 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 16:43:51,737 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,737 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 71 [2023-12-02 16:43:51,773 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:51,820 INFO L349 Elim1Store]: treesize reduction 108, result has 32.1 percent of original size [2023-12-02 16:43:51,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 80 [2023-12-02 16:43:51,833 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,834 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 116 treesize of output 104 [2023-12-02 16:43:51,847 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,848 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 65 treesize of output 69 [2023-12-02 16:43:51,879 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 7 treesize of output 3 [2023-12-02 16:43:51,898 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:51,898 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 60 treesize of output 70 [2023-12-02 16:43:51,952 INFO L173 IndexEqualityManager]: detected equality via solver [2023-12-02 16:43:51,999 INFO L349 Elim1Store]: treesize reduction 108, result has 32.1 percent of original size [2023-12-02 16:43:51,999 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 80 [2023-12-02 16:43:52,012 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:52,013 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 83 treesize of output 83 [2023-12-02 16:43:52,020 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 50 treesize of output 46 [2023-12-02 16:43:52,041 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 8 treesize of output 4 [2023-12-02 16:43:52,066 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:43:52,066 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 45 treesize of output 51 [2023-12-02 16:43:54,783 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653098315] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:43:54,783 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [211440619] [2023-12-02 16:43:54,802 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2023-12-02 16:43:54,802 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:43:54,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:43:54,809 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:43:54,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:43:57,954 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_back with input of size 1 for LOIs [2023-12-02 16:43:57,999 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 106 for LOIs [2023-12-02 16:43:58,355 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 1 for LOIs [2023-12-02 16:43:58,391 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-12-02 16:43:58,393 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 95 for LOIs [2023-12-02 16:43:58,408 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:44:06,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [211440619] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:06,512 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:44:06,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [5, 11] total 28 [2023-12-02 16:44:06,513 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516581884] [2023-12-02 16:44:06,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:06,513 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 16:44:06,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:06,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 16:44:06,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=1083, Unknown=11, NotChecked=66, Total=1260 [2023-12-02 16:44:06,515 INFO L87 Difference]: Start difference. First operand 125 states and 166 transitions. Second operand has 16 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 8 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-12-02 16:44:09,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:09,631 INFO L93 Difference]: Finished difference Result 190 states and 248 transitions. [2023-12-02 16:44:09,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-12-02 16:44:09,632 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 8 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) Word has length 53 [2023-12-02 16:44:09,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:09,635 INFO L225 Difference]: With dead ends: 190 [2023-12-02 16:44:09,635 INFO L226 Difference]: Without dead ends: 137 [2023-12-02 16:44:09,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 106 SyntacticMatches, 20 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=115, Invalid=1210, Unknown=11, NotChecked=70, Total=1406 [2023-12-02 16:44:09,637 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 8 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 4 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 753 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:09,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 753 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 325 Invalid, 9 Unknown, 0 Unchecked, 2.0s Time] [2023-12-02 16:44:09,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-12-02 16:44:09,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2023-12-02 16:44:09,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 72 states have internal predecessors, (82), 48 states have call successors, (48), 18 states have call predecessors, (48), 19 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-12-02 16:44:09,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 178 transitions. [2023-12-02 16:44:09,663 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 178 transitions. Word has length 53 [2023-12-02 16:44:09,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:09,663 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 178 transitions. [2023-12-02 16:44:09,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 9 states have (on average 2.111111111111111) internal successors, (19), 11 states have internal predecessors, (19), 8 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2023-12-02 16:44:09,663 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 178 transitions. [2023-12-02 16:44:09,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2023-12-02 16:44:09,665 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:09,665 INFO L195 NwaCegarLoop]: trace histogram [6, 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] [2023-12-02 16:44:09,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 16:44:09,866 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:09,866 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:09,866 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:09,866 INFO L85 PathProgramCache]: Analyzing trace with hash 2005624516, now seen corresponding path program 1 times [2023-12-02 16:44:09,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:09,867 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772735440] [2023-12-02 16:44:09,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:09,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:09,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:10,131 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:44:10,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:10,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772735440] [2023-12-02 16:44:10,132 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772735440] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:10,132 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591468510] [2023-12-02 16:44:10,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:10,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:10,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:10,134 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:10,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 16:44:10,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:10,321 INFO L262 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:44:10,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:44:10,425 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:10,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591468510] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:10,425 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:10,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-12-02 16:44:10,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422379255] [2023-12-02 16:44:10,426 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:10,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:44:10,427 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:10,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:44:10,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:44:10,428 INFO L87 Difference]: Start difference. First operand 137 states and 178 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:44:10,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:10,630 INFO L93 Difference]: Finished difference Result 249 states and 327 transitions. [2023-12-02 16:44:10,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:44:10,630 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 55 [2023-12-02 16:44:10,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:10,632 INFO L225 Difference]: With dead ends: 249 [2023-12-02 16:44:10,632 INFO L226 Difference]: Without dead ends: 137 [2023-12-02 16:44:10,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2023-12-02 16:44:10,634 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 39 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:10,634 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 399 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:44:10,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2023-12-02 16:44:10,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2023-12-02 16:44:10,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 69 states have (on average 1.1594202898550725) internal successors, (80), 72 states have internal predecessors, (80), 48 states have call successors, (48), 18 states have call predecessors, (48), 19 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-12-02 16:44:10,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 176 transitions. [2023-12-02 16:44:10,667 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 176 transitions. Word has length 55 [2023-12-02 16:44:10,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:10,667 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 176 transitions. [2023-12-02 16:44:10,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 7 states have internal predecessors, (27), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:44:10,668 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 176 transitions. [2023-12-02 16:44:10,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 16:44:10,670 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:10,670 INFO L195 NwaCegarLoop]: trace histogram [6, 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 16:44:10,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 16:44:10,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:10,875 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:10,876 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:10,876 INFO L85 PathProgramCache]: Analyzing trace with hash -606183796, now seen corresponding path program 1 times [2023-12-02 16:44:10,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:10,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625260878] [2023-12-02 16:44:10,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:10,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:10,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:11,140 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:44:11,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:11,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625260878] [2023-12-02 16:44:11,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625260878] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:11,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990558156] [2023-12-02 16:44:11,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:11,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:11,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:11,142 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:11,144 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 16:44:11,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:11,338 INFO L262 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 16:44:11,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:11,459 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 16:44:11,459 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:11,459 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990558156] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:11,459 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:11,459 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [9] total 16 [2023-12-02 16:44:11,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417188598] [2023-12-02 16:44:11,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:11,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:44:11,460 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:11,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:44:11,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2023-12-02 16:44:11,461 INFO L87 Difference]: Start difference. First operand 137 states and 176 transitions. Second operand has 9 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:44:11,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:11,680 INFO L93 Difference]: Finished difference Result 263 states and 345 transitions. [2023-12-02 16:44:11,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:44:11,681 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 57 [2023-12-02 16:44:11,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:11,683 INFO L225 Difference]: With dead ends: 263 [2023-12-02 16:44:11,683 INFO L226 Difference]: Without dead ends: 149 [2023-12-02 16:44:11,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2023-12-02 16:44:11,685 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 61 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 448 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:11,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 448 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:44:11,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2023-12-02 16:44:11,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 139. [2023-12-02 16:44:11,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 71 states have (on average 1.1549295774647887) internal successors, (82), 74 states have internal predecessors, (82), 48 states have call successors, (48), 18 states have call predecessors, (48), 19 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-12-02 16:44:11,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 178 transitions. [2023-12-02 16:44:11,716 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 178 transitions. Word has length 57 [2023-12-02 16:44:11,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:11,716 INFO L495 AbstractCegarLoop]: Abstraction has 139 states and 178 transitions. [2023-12-02 16:44:11,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:44:11,717 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 178 transitions. [2023-12-02 16:44:11,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2023-12-02 16:44:11,718 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:11,718 INFO L195 NwaCegarLoop]: trace histogram [6, 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 16:44:11,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 16:44:11,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:11,919 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:11,919 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:11,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1117776829, now seen corresponding path program 1 times [2023-12-02 16:44:11,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:11,919 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961354791] [2023-12-02 16:44:11,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:11,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:11,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:12,094 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 16:44:12,094 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:12,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961354791] [2023-12-02 16:44:12,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [961354791] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:12,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754251870] [2023-12-02 16:44:12,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:12,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:12,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:12,096 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:12,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 16:44:12,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:12,285 INFO L262 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 16:44:12,288 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:12,300 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 16:44:12,300 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:44:12,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754251870] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:44:12,300 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:44:12,300 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2023-12-02 16:44:12,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291083635] [2023-12-02 16:44:12,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:44:12,301 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 16:44:12,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:44:12,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 16:44:12,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:44:12,302 INFO L87 Difference]: Start difference. First operand 139 states and 178 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 16:44:12,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:44:12,370 INFO L93 Difference]: Finished difference Result 255 states and 337 transitions. [2023-12-02 16:44:12,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 16:44:12,371 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) Word has length 58 [2023-12-02 16:44:12,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:44:12,373 INFO L225 Difference]: With dead ends: 255 [2023-12-02 16:44:12,373 INFO L226 Difference]: Without dead ends: 147 [2023-12-02 16:44:12,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 16:44:12,375 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 2 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:44:12,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 142 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:44:12,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2023-12-02 16:44:12,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 141. [2023-12-02 16:44:12,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 76 states have internal predecessors, (84), 48 states have call successors, (48), 18 states have call predecessors, (48), 19 states have return successors, (48), 46 states have call predecessors, (48), 46 states have call successors, (48) [2023-12-02 16:44:12,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 180 transitions. [2023-12-02 16:44:12,417 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 180 transitions. Word has length 58 [2023-12-02 16:44:12,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:44:12,418 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 180 transitions. [2023-12-02 16:44:12,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 2 states have call successors, (11) [2023-12-02 16:44:12,418 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 180 transitions. [2023-12-02 16:44:12,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-12-02 16:44:12,419 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:44:12,420 INFO L195 NwaCegarLoop]: trace histogram [6, 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, 1, 1] [2023-12-02 16:44:12,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 16:44:12,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:12,620 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:44:12,621 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:44:12,621 INFO L85 PathProgramCache]: Analyzing trace with hash -1959425231, now seen corresponding path program 1 times [2023-12-02 16:44:12,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:44:12,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957693583] [2023-12-02 16:44:12,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:12,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:44:12,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:12,890 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 16:44:12,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:44:12,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957693583] [2023-12-02 16:44:12,891 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957693583] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:44:12,891 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478034891] [2023-12-02 16:44:12,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:44:12,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:44:12,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:44:12,892 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:44:12,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 16:44:13,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:44:13,108 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 62 conjunts are in the unsatisfiable core [2023-12-02 16:44:13,113 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:44:13,190 INFO L349 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2023-12-02 16:44:13,190 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 1 case distinctions, treesize of input 14 treesize of output 15 [2023-12-02 16:44:13,195 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 8 treesize of output 1 [2023-12-02 16:44:13,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2023-12-02 16:44:13,206 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 21 treesize of output 1 [2023-12-02 16:44:13,209 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 11 [2023-12-02 16:44:13,214 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 18 [2023-12-02 16:44:13,218 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 16:44:13,221 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 12 treesize of output 1 [2023-12-02 16:44:24,600 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 29 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:44:24,601 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:44:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 16:44:27,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478034891] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:44:27,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444652511] [2023-12-02 16:44:27,844 INFO L159 IcfgInterpreter]: Started Sifa with 43 locations of interest [2023-12-02 16:44:27,844 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:44:27,845 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:44:27,845 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:44:27,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:44:30,089 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_back with input of size 1 for LOIs [2023-12-02 16:44:30,177 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 106 for LOIs [2023-12-02 16:44:30,443 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 1 for LOIs [2023-12-02 16:44:30,507 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-12-02 16:44:30,509 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 95 for LOIs [2023-12-02 16:44:30,520 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 8 for LOIs [2023-12-02 16:44:30,542 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:45:04,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1444652511] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:45:04,468 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:45:04,468 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [6, 15, 7] total 42 [2023-12-02 16:45:04,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224044806] [2023-12-02 16:45:04,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:45:04,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 16:45:04,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:45:04,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 16:45:04,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1573, Unknown=21, NotChecked=0, Total=1722 [2023-12-02 16:45:04,470 INFO L87 Difference]: Start difference. First operand 141 states and 180 transitions. Second operand has 21 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 9 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2023-12-02 16:45:07,877 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 16:45:09,902 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:45:23,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:45:23,856 INFO L93 Difference]: Finished difference Result 269 states and 345 transitions. [2023-12-02 16:45:23,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-12-02 16:45:23,856 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 9 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) Word has length 61 [2023-12-02 16:45:23,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:45:23,858 INFO L225 Difference]: With dead ends: 269 [2023-12-02 16:45:23,859 INFO L226 Difference]: Without dead ends: 159 [2023-12-02 16:45:23,860 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 133 SyntacticMatches, 17 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 53.7s TimeCoverageRelationStatistics Valid=167, Invalid=2064, Unknown=25, NotChecked=0, Total=2256 [2023-12-02 16:45:23,861 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 25 mSDsluCounter, 930 mSDsCounter, 0 mSdLazyCounter, 615 mSolverCounterSat, 6 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 987 SdHoareTripleChecker+Invalid, 630 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 615 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:45:23,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 987 Invalid, 630 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 615 Invalid, 9 Unknown, 0 Unchecked, 6.5s Time] [2023-12-02 16:45:23,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2023-12-02 16:45:23,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 153. [2023-12-02 16:45:23,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 80 states have (on average 1.1375) internal successors, (91), 86 states have internal predecessors, (91), 50 states have call successors, (50), 20 states have call predecessors, (50), 22 states have return successors, (52), 46 states have call predecessors, (52), 48 states have call successors, (52) [2023-12-02 16:45:23,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 193 transitions. [2023-12-02 16:45:23,895 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 193 transitions. Word has length 61 [2023-12-02 16:45:23,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:45:23,895 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 193 transitions. [2023-12-02 16:45:23,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 9 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (11), 8 states have call predecessors, (11), 8 states have call successors, (11) [2023-12-02 16:45:23,896 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 193 transitions. [2023-12-02 16:45:23,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2023-12-02 16:45:23,897 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:45:23,897 INFO L195 NwaCegarLoop]: trace histogram [6, 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, 1, 1, 1] [2023-12-02 16:45:23,903 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 16:45:24,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:24,100 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:45:24,100 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:45:24,100 INFO L85 PathProgramCache]: Analyzing trace with hash 570752182, now seen corresponding path program 1 times [2023-12-02 16:45:24,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:45:24,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549480702] [2023-12-02 16:45:24,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:24,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:45:24,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:25,955 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 5 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 16:45:25,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:45:25,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549480702] [2023-12-02 16:45:25,955 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549480702] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:45:25,955 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800586993] [2023-12-02 16:45:25,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:25,956 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:25,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:45:25,957 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:45:25,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 16:45:26,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:26,196 INFO L262 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 59 conjunts are in the unsatisfiable core [2023-12-02 16:45:26,200 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:45:26,212 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-12-02 16:45:26,492 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 16:45:26,508 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 16:45:26,508 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 16:45:26,524 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-12-02 16:45:26,525 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 11 treesize of output 11 [2023-12-02 16:45:26,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:45:26,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 23 [2023-12-02 16:45:26,574 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 18 treesize of output 11 [2023-12-02 16:45:27,135 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 26 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 16:45:27,135 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:45:27,653 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:45:27,653 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 42 treesize of output 35 [2023-12-02 16:45:27,673 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:45:27,673 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 171 treesize of output 185 [2023-12-02 16:45:27,682 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 184 treesize of output 176 [2023-12-02 16:45:27,753 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 16:45:27,820 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:45:27,820 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 106 treesize of output 104 [2023-12-02 16:45:27,910 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 8 treesize of output 6 [2023-12-02 16:45:27,914 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 8 treesize of output 6 [2023-12-02 16:45:27,921 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 49 [2023-12-02 16:45:28,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800586993] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:45:28,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1809041140] [2023-12-02 16:45:28,167 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-12-02 16:45:28,167 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:45:28,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:45:28,168 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:45:28,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:45:33,723 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_back with input of size 1 for LOIs [2023-12-02 16:45:34,146 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 1 for LOIs [2023-12-02 16:45:34,170 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 16:45:34,175 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 1 for LOIs [2023-12-02 16:45:34,262 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-12-02 16:45:34,263 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 95 for LOIs [2023-12-02 16:45:34,275 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 1 for LOIs [2023-12-02 16:45:34,297 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:45:38,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5301#(and (<= 0 |__VERIFIER_assert_#in~cond|) (= (mod __VERIFIER_assert_~cond 256) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= |__VERIFIER_assert_#in~cond| 1))' at error location [2023-12-02 16:45:38,474 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:45:38,474 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:45:38,474 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 28 [2023-12-02 16:45:38,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717389730] [2023-12-02 16:45:38,475 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 16:45:38,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-12-02 16:45:38,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:45:38,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-12-02 16:45:38,478 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=3684, Unknown=22, NotChecked=0, Total=3906 [2023-12-02 16:45:38,478 INFO L87 Difference]: Start difference. First operand 153 states and 193 transitions. Second operand has 28 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 25 states have internal predecessors, (65), 13 states have call successors, (27), 6 states have call predecessors, (27), 8 states have return successors, (24), 11 states have call predecessors, (24), 13 states have call successors, (24) [2023-12-02 16:45:42,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:45:42,203 INFO L93 Difference]: Finished difference Result 304 states and 395 transitions. [2023-12-02 16:45:42,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 16:45:42,203 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 25 states have internal predecessors, (65), 13 states have call successors, (27), 6 states have call predecessors, (27), 8 states have return successors, (24), 11 states have call predecessors, (24), 13 states have call successors, (24) Word has length 64 [2023-12-02 16:45:42,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:45:42,206 INFO L225 Difference]: With dead ends: 304 [2023-12-02 16:45:42,206 INFO L226 Difference]: Without dead ends: 184 [2023-12-02 16:45:42,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 135 SyntacticMatches, 9 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2331 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=472, Invalid=7686, Unknown=32, NotChecked=0, Total=8190 [2023-12-02 16:45:42,210 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 210 mSDsluCounter, 1107 mSDsCounter, 0 mSdLazyCounter, 2042 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 2213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 2042 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:45:42,210 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 1186 Invalid, 2213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 2042 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-12-02 16:45:42,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2023-12-02 16:45:42,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 159. [2023-12-02 16:45:42,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 86 states have (on average 1.186046511627907) internal successors, (102), 90 states have internal predecessors, (102), 50 states have call successors, (50), 20 states have call predecessors, (50), 22 states have return successors, (52), 48 states have call predecessors, (52), 48 states have call successors, (52) [2023-12-02 16:45:42,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 204 transitions. [2023-12-02 16:45:42,240 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 204 transitions. Word has length 64 [2023-12-02 16:45:42,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:45:42,241 INFO L495 AbstractCegarLoop]: Abstraction has 159 states and 204 transitions. [2023-12-02 16:45:42,241 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 23 states have (on average 2.8260869565217392) internal successors, (65), 25 states have internal predecessors, (65), 13 states have call successors, (27), 6 states have call predecessors, (27), 8 states have return successors, (24), 11 states have call predecessors, (24), 13 states have call successors, (24) [2023-12-02 16:45:42,241 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 204 transitions. [2023-12-02 16:45:42,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-12-02 16:45:42,242 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:45:42,243 INFO L195 NwaCegarLoop]: trace histogram [6, 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] [2023-12-02 16:45:42,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 16:45:42,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:42,443 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:45:42,444 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:45:42,444 INFO L85 PathProgramCache]: Analyzing trace with hash -456621335, now seen corresponding path program 2 times [2023-12-02 16:45:42,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:45:42,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469400086] [2023-12-02 16:45:42,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:45:42,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:45:42,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:45:46,772 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 16:45:46,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:45:46,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469400086] [2023-12-02 16:45:46,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469400086] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:45:46,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413024181] [2023-12-02 16:45:46,772 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 16:45:46,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:45:46,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:45:46,773 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:45:46,774 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 16:45:47,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 16:45:47,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 16:45:47,110 INFO L262 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 101 conjunts are in the unsatisfiable core [2023-12-02 16:45:47,116 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:45:47,175 INFO L349 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2023-12-02 16:45:47,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 27 treesize of output 45 [2023-12-02 16:45:47,642 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 18 treesize of output 7 [2023-12-02 16:45:47,655 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 14 treesize of output 15 [2023-12-02 16:45:47,791 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 26 [2023-12-02 16:45:47,806 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 16:45:47,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 20 [2023-12-02 16:45:47,813 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 0 case distinctions, treesize of input 11 treesize of output 7 [2023-12-02 16:45:47,824 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 36 [2023-12-02 16:45:47,840 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-12-02 16:45:47,840 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 20 [2023-12-02 16:45:47,879 INFO L349 Elim1Store]: treesize reduction 16, result has 51.5 percent of original size [2023-12-02 16:45:47,879 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 26 treesize of output 32 [2023-12-02 16:45:48,016 INFO L349 Elim1Store]: treesize reduction 56, result has 8.2 percent of original size [2023-12-02 16:45:48,016 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 121 treesize of output 108 [2023-12-02 16:45:48,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:45:48,031 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 8 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 38 [2023-12-02 16:45:48,035 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 21 [2023-12-02 16:45:48,047 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 23 [2023-12-02 16:49:01,113 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 13 refuted. 36 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 16:49:01,113 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:49:06,819 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-12-02 16:49:06,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413024181] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:49:06,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980670065] [2023-12-02 16:49:06,821 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-12-02 16:49:06,821 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:49:06,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:49:06,822 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:49:06,822 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:49:09,100 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_back with input of size 1 for LOIs [2023-12-02 16:49:09,473 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_empty with input of size 1 for LOIs [2023-12-02 16:49:09,499 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-12-02 16:49:09,504 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 1 for LOIs [2023-12-02 16:49:09,600 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 1 for LOIs [2023-12-02 16:49:09,602 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 95 for LOIs [2023-12-02 16:49:09,613 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 1 for LOIs [2023-12-02 16:49:09,634 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 16:49:32,946 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6528#(and (<= 0 |__VERIFIER_assert_#in~cond|) (= (mod __VERIFIER_assert_~cond 256) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (<= |__VERIFIER_assert_#in~cond| 1))' at error location [2023-12-02 16:49:32,946 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 16:49:32,946 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 16:49:32,946 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 29, 7] total 48 [2023-12-02 16:49:32,946 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683981594] [2023-12-02 16:49:32,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 16:49:32,947 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2023-12-02 16:49:32,947 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:49:32,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2023-12-02 16:49:32,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=4832, Unknown=210, NotChecked=0, Total=5256 [2023-12-02 16:49:32,950 INFO L87 Difference]: Start difference. First operand 159 states and 204 transitions. Second operand has 48 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 23 states have call successors, (39), 14 states have call predecessors, (39), 15 states have return successors, (35), 19 states have call predecessors, (35), 21 states have call successors, (35) [2023-12-02 16:49:47,054 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 16:49:58,505 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:05,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.60s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:12,739 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:17,590 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.07s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:19,027 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:21,100 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:26,713 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.21s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:29,741 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.37s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:34,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.01s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:36,798 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:51,035 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:54,281 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.83s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:56,075 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:50:58,183 WARN L539 Checker$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 16:51:14,868 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:16,892 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:18,950 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:20,974 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:23,047 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:25,106 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:51:27,133 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:52:39,908 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.19s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:52:42,414 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.33s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:52:44,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.89s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:52:46,860 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.53s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:53:03,987 WARN L539 Checker$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 16:53:06,008 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:53:08,753 WARN L539 Checker$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 16:53:11,311 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:53:13,328 WARN L539 Checker$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 16:54:20,950 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.24s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:22,959 WARN L539 Checker$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 16:54:24,968 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:26,374 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:28,382 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:47,753 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.56s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:50,662 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:52,739 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.65s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:55,922 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.77s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:54:58,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.71s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:55:00,794 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:55:04,157 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.62s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:55:07,097 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 16:55:11,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:55:11,009 INFO L93 Difference]: Finished difference Result 316 states and 408 transitions. [2023-12-02 16:55:11,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 16:55:11,010 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 23 states have call successors, (39), 14 states have call predecessors, (39), 15 states have return successors, (35), 19 states have call predecessors, (35), 21 states have call successors, (35) Word has length 70 [2023-12-02 16:55:11,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:55:11,012 INFO L225 Difference]: With dead ends: 316 [2023-12-02 16:55:11,012 INFO L226 Difference]: Without dead ends: 252 [2023-12-02 16:55:11,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 150 SyntacticMatches, 5 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3108 ImplicationChecksByTransitivity, 337.6s TimeCoverageRelationStatistics Valid=583, Invalid=12028, Unknown=729, NotChecked=0, Total=13340 [2023-12-02 16:55:11,017 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 253 mSDsluCounter, 968 mSDsCounter, 0 mSdLazyCounter, 2911 mSolverCounterSat, 144 mSolverCounterUnsat, 887 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 182.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 1031 SdHoareTripleChecker+Invalid, 3942 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 144 IncrementalHoareTripleChecker+Valid, 2911 IncrementalHoareTripleChecker+Invalid, 887 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 183.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:55:11,018 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 1031 Invalid, 3942 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [144 Valid, 2911 Invalid, 887 Unknown, 0 Unchecked, 183.5s Time] [2023-12-02 16:55:11,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2023-12-02 16:55:11,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 228. [2023-12-02 16:55:11,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 123 states have (on average 1.146341463414634) internal successors, (141), 128 states have internal predecessors, (141), 70 states have call successors, (70), 32 states have call predecessors, (70), 34 states have return successors, (75), 67 states have call predecessors, (75), 68 states have call successors, (75) [2023-12-02 16:55:11,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 286 transitions. [2023-12-02 16:55:11,138 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 286 transitions. Word has length 70 [2023-12-02 16:55:11,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:55:11,139 INFO L495 AbstractCegarLoop]: Abstraction has 228 states and 286 transitions. [2023-12-02 16:55:11,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 42 states have (on average 2.2142857142857144) internal successors, (93), 41 states have internal predecessors, (93), 23 states have call successors, (39), 14 states have call predecessors, (39), 15 states have return successors, (35), 19 states have call predecessors, (35), 21 states have call successors, (35) [2023-12-02 16:55:11,139 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 286 transitions. [2023-12-02 16:55:11,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-12-02 16:55:11,141 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:55:11,141 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 3, 3, 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 16:55:11,149 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 16:55:11,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:11,349 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:55:11,349 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:55:11,349 INFO L85 PathProgramCache]: Analyzing trace with hash -538372689, now seen corresponding path program 1 times [2023-12-02 16:55:11,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 16:55:11,349 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295323743] [2023-12-02 16:55:11,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:11,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 16:55:11,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:13,907 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 1 proven. 24 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2023-12-02 16:55:13,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 16:55:13,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295323743] [2023-12-02 16:55:13,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295323743] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 16:55:13,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314934283] [2023-12-02 16:55:13,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:55:13,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:55:13,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:55:13,908 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 16:55:13,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 16:55:14,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:55:14,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 85 conjunts are in the unsatisfiable core [2023-12-02 16:55:14,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:55:14,192 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 18 treesize of output 7 [2023-12-02 16:55:14,196 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 18 treesize of output 7 [2023-12-02 16:55:16,899 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 31 proven. 23 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 16:55:16,899 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:55:18,211 INFO L349 Elim1Store]: treesize reduction 34, result has 59.0 percent of original size [2023-12-02 16:55:18,211 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 3 new quantified variables, introduced 3 case distinctions, treesize of input 941 treesize of output 905 [2023-12-02 16:55:19,494 INFO L349 Elim1Store]: treesize reduction 354, result has 58.8 percent of original size [2023-12-02 16:55:19,495 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 11 select indices, 11 select index equivalence classes, 1 disjoint index pairs (out of 55 index pairs), introduced 12 new quantified variables, introduced 54 case distinctions, treesize of input 4778 treesize of output 4782 [2023-12-02 16:55:19,766 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 0 case distinctions, treesize of input 1619 treesize of output 1579 [2023-12-02 16:55:19,875 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 16:55:19,876 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 1708 treesize of output 1658 [2023-12-02 16:56:56,408 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 101 [2023-12-02 16:56:56,408 WARN L249 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2023-12-02 16:56:56,408 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2023-12-02 16:56:56,409 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1233201550] [2023-12-02 16:56:56,411 INFO L159 IcfgInterpreter]: Started Sifa with 44 locations of interest [2023-12-02 16:56:56,411 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 16:56:56,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 16:56:56,412 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 16:56:56,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 16:56:56,414 FATAL L? ?]: Ignoring exception! de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:177) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.push(Scriptor.java:132) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.push(DiffWrapperScript.java:90) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.push(WrapperScript.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.push(HistoryRecordingScript.java:107) at de.uni_freiburg.informatik.ultimate.logic.Util.checkSat(Util.java:48) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.SmtUtils.checkSatTerm(SmtUtils.java:332) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.isFalse(SymbolicTools.java:223) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.RelationCheckUtil.isEqBottom_SolverAlphaSolver(RelationCheckUtil.java:56) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.ExplicitValueDomain.isEqBottom(ExplicitValueDomain.java:73) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.CompoundDomain.isEqBottom(CompoundDomain.java:84) at de.uni_freiburg.informatik.ultimate.lib.sifa.domain.StatsWrapperDomain.isEqBottom(StatsWrapperDomain.java:69) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.earlyExitAfterStep(DagInterpreter.java:139) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:125) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:175) ... 44 more [2023-12-02 16:56:56,416 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-12-02 16:56:56,416 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2023-12-02 16:56:56,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146787513] [2023-12-02 16:56:56,416 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-12-02 16:56:56,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-12-02 16:56:56,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 16:56:56,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-12-02 16:56:56,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2000, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:56:56,419 INFO L87 Difference]: Start difference. First operand 228 states and 286 transitions. Second operand has 16 states, 14 states have (on average 2.7857142857142856) internal successors, (39), 14 states have internal predecessors, (39), 7 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 6 states have call predecessors, (13), 7 states have call successors, (13) [2023-12-02 16:56:56,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 104 SyntacticMatches, 11 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=162, Invalid=2000, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 16:56:56,420 INFO L413 NwaCegarLoop]: 0 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 0 SdHoareTripleChecker+Invalid, 1 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 16:56:56,421 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 0 Invalid, 1 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 16:56:56,428 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 16:56:56,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 16:56:56,622 FATAL L? ?]: An unrecoverable error occured during an interaction with an SMT solver: de.uni_freiburg.informatik.ultimate.logic.SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:177) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Scriptor.pop(Scriptor.java:139) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.arrays.DiffWrapperScript.pop(DiffWrapperScript.java:99) at de.uni_freiburg.informatik.ultimate.logic.WrapperScript.pop(WrapperScript.java:153) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.scripttransfer.HistoryRecordingScript.pop(HistoryRecordingScript.java:117) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.pop(ManagedScript.java:138) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.unAssertCodeBlock(IncrementalHoareTripleChecker.java:436) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.clearAssertionStack(IncrementalHoareTripleChecker.java:278) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.releaseLock(IncrementalHoareTripleChecker.java:284) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker$ProtectedHtc.releaseLock(ChainingHoareTripleChecker.java:449) at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ChainingHoareTripleChecker.releaseLock(ChainingHoareTripleChecker.java:98) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.releaseLock(CachingHoareTripleChecker.java:159) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.switchToReadonlyMode(AbstractInterpolantAutomaton.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.NwaCegarLoop.computeAutomataDifference(NwaCegarLoop.java:365) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.NwaCegarLoop.refineAbstraction(NwaCegarLoop.java:325) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:487) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) Caused by: java.io.IOException: Stream closed at java.base/java.lang.ProcessBuilder$NullOutputStream.write(ProcessBuilder.java:442) at java.base/java.io.OutputStream.write(OutputStream.java:157) at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81) at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142) at java.base/sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:318) at java.base/sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:153) at java.base/java.io.OutputStreamWriter.flush(OutputStreamWriter.java:251) at java.base/java.io.BufferedWriter.flush(BufferedWriter.java:257) at de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.input(Executor.java:175) ... 36 more [2023-12-02 16:56:56,623 INFO L158 Benchmark]: Toolchain (without parser) took 804566.21ms. Allocated memory was 180.4MB in the beginning and 522.2MB in the end (delta: 341.8MB). Free memory was 142.7MB in the beginning and 216.3MB in the end (delta: -73.6MB). Peak memory consumption was 268.1MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,624 INFO L158 Benchmark]: CDTParser took 0.16ms. Allocated memory is still 121.6MB. Free memory is still 91.7MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 16:56:56,624 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1957.88ms. Allocated memory is still 180.4MB. Free memory was 141.8MB in the beginning and 99.4MB in the end (delta: 42.4MB). Peak memory consumption was 94.7MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,624 INFO L158 Benchmark]: Boogie Procedure Inliner took 120.58ms. Allocated memory is still 180.4MB. Free memory was 99.4MB in the beginning and 94.1MB in the end (delta: 5.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,624 INFO L158 Benchmark]: Boogie Preprocessor took 44.90ms. Allocated memory is still 180.4MB. Free memory was 94.1MB in the beginning and 91.0MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,625 INFO L158 Benchmark]: RCFGBuilder took 655.46ms. Allocated memory was 180.4MB in the beginning and 249.6MB in the end (delta: 69.2MB). Free memory was 91.0MB in the beginning and 177.8MB in the end (delta: -86.8MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,625 INFO L158 Benchmark]: TraceAbstraction took 801780.90ms. Allocated memory was 249.6MB in the beginning and 522.2MB in the end (delta: 272.6MB). Free memory was 177.8MB in the beginning and 216.3MB in the end (delta: -38.5MB). Peak memory consumption was 235.2MB. Max. memory is 16.1GB. [2023-12-02 16:56:56,627 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16ms. Allocated memory is still 121.6MB. Free memory is still 91.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1957.88ms. Allocated memory is still 180.4MB. Free memory was 141.8MB in the beginning and 99.4MB in the end (delta: 42.4MB). Peak memory consumption was 94.7MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 120.58ms. Allocated memory is still 180.4MB. Free memory was 99.4MB in the beginning and 94.1MB in the end (delta: 5.3MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 44.90ms. Allocated memory is still 180.4MB. Free memory was 94.1MB in the beginning and 91.0MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 655.46ms. Allocated memory was 180.4MB in the beginning and 249.6MB in the end (delta: 69.2MB). Free memory was 91.0MB in the beginning and 177.8MB in the end (delta: -86.8MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * TraceAbstraction took 801780.90ms. Allocated memory was 249.6MB in the beginning and 522.2MB in the end (delta: 272.6MB). Free memory was 177.8MB in the beginning and 216.3MB in the end (delta: -38.5MB). Peak memory consumption was 235.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMTLIBException: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Connection to SMT solver broken: de.uni_freiburg.informatik.ultimate.smtsolver.external.Executor.convertIOException(Executor.java:337) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-64bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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 f57bc64edf303a057c8eafb48480d4e5b764bd411481261d53eb2a101eb82ae8 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 16:56:58,353 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 16:56:58,430 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-64bit-Taipan_Bitvector.epf [2023-12-02 16:56:58,435 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 16:56:58,435 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 16:56:58,463 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 16:56:58,463 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 16:56:58,464 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 16:56:58,464 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 16:56:58,465 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 16:56:58,466 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 16:56:58,466 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 16:56:58,467 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 16:56:58,468 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 16:56:58,468 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 16:56:58,469 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 16:56:58,470 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 16:56:58,470 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 16:56:58,471 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 16:56:58,471 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 16:56:58,472 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 16:56:58,473 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 16:56:58,473 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-12-02 16:56:58,474 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2023-12-02 16:56:58,474 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2023-12-02 16:56:58,475 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 16:56:58,475 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 16:56:58,476 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 16:56:58,476 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-12-02 16:56:58,477 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 16:56:58,477 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 16:56:58,478 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:56:58,478 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 16:56:58,478 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 16:56:58,479 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 16:56:58,479 INFO L153 SettingsManager]: * Trace refinement strategy=WALRUS [2023-12-02 16:56:58,479 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2023-12-02 16:56:58,479 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 16:56:58,479 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 16:56:58,480 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 16:56:58,480 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 16:56:58,480 INFO L153 SettingsManager]: * Logic for external solver=AUFBV 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f57bc64edf303a057c8eafb48480d4e5b764bd411481261d53eb2a101eb82ae8 [2023-12-02 16:56:58,756 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 16:56:58,779 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 16:56:58,781 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 16:56:58,782 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 16:56:58,783 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 16:56:58,784 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i [2023-12-02 16:57:01,623 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 16:57:02,025 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 16:57:02,025 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i [2023-12-02 16:57:02,056 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/86273ac67/7a063581377f4d9ba5ece72873005911/FLAGa192183ba [2023-12-02 16:57:02,072 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/data/86273ac67/7a063581377f4d9ba5ece72873005911 [2023-12-02 16:57:02,075 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 16:57:02,077 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 16:57:02,078 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 16:57:02,078 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 16:57:02,084 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 16:57:02,085 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:57:02" (1/1) ... [2023-12-02 16:57:02,086 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39a1e71b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:02, skipping insertion in model container [2023-12-02 16:57:02,087 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 04:57:02" (1/1) ... [2023-12-02 16:57:02,192 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:57:02,437 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4494,4507] [2023-12-02 16:57:02,444 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4554,4567] [2023-12-02 16:57:03,129 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,130 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,131 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,132 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,133 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,148 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,148 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,150 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,151 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,153 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,154 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,155 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,156 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,458 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 16:57:03,459 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 16:57:03,461 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 16:57:03,462 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 16:57:03,464 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 16:57:03,465 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 16:57:03,466 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 16:57:03,467 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 16:57:03,467 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 16:57:03,468 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 16:57:03,635 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:57:03,661 INFO L199 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2023-12-02 16:57:03,717 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 16:57:03,722 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4494,4507] [2023-12-02 16:57:03,722 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4554,4567] [2023-12-02 16:57:03,766 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,767 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,767 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,768 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,769 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,777 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,777 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,778 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,779 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,780 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,781 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,782 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,782 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,828 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 16:57:03,829 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 16:57:03,830 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 16:57:03,831 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 16:57:03,832 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 16:57:03,833 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 16:57:03,834 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 16:57:03,834 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 16:57:03,835 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 16:57:03,836 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 16:57:03,880 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:57:03,912 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 16:57:03,922 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4494,4507] [2023-12-02 16:57:03,923 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_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness.i[4554,4567] [2023-12-02 16:57:03,958 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,959 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,959 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,960 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,960 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,969 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,970 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,971 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,971 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,972 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,972 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,973 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:03,973 WARN L1590 CHandler]: Possible shadowing of function index [2023-12-02 16:57:04,003 WARN L638 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-12-02 16:57:04,003 WARN L638 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-12-02 16:57:04,004 WARN L638 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-12-02 16:57:04,004 WARN L638 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-12-02 16:57:04,005 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-12-02 16:57:04,005 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-12-02 16:57:04,006 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-12-02 16:57:04,006 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-12-02 16:57:04,006 WARN L638 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-12-02 16:57:04,007 WARN L638 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-12-02 16:57:04,042 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 16:57:04,279 WARN L675 CHandler]: The function __atomic_fetch_or is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,279 WARN L675 CHandler]: The function __atomic_fetch_sub is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,279 WARN L675 CHandler]: The function __atomic_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,279 WARN L675 CHandler]: The function __atomic_fetch_xor is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,279 WARN L675 CHandler]: The function htons is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function ntohl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function __atomic_compare_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function __atomic_fetch_add is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function htonl is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function __atomic_store_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,280 WARN L675 CHandler]: The function ntohs is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,281 WARN L675 CHandler]: The function __atomic_load_n is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,281 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,281 WARN L675 CHandler]: The function __atomic_thread_fence is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,281 WARN L675 CHandler]: The function __atomic_fetch_and is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,281 WARN L675 CHandler]: The function aws_array_list_ensure_capacity is called, but not defined or handled by StandardFunctionHandler. [2023-12-02 16:57:04,287 INFO L206 MainTranslator]: Completed translation [2023-12-02 16:57:04,288 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04 WrapperNode [2023-12-02 16:57:04,288 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 16:57:04,288 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 16:57:04,289 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 16:57:04,289 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 16:57:04,295 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,360 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,395 INFO L138 Inliner]: procedures = 697, calls = 1045, calls flagged for inlining = 50, calls inlined = 5, statements flattened = 134 [2023-12-02 16:57:04,396 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 16:57:04,397 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 16:57:04,397 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 16:57:04,397 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 16:57:04,405 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,405 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,410 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,416 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,433 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,437 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,444 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,447 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,454 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 16:57:04,455 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 16:57:04,456 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 16:57:04,456 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 16:57:04,457 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (1/1) ... [2023-12-02 16:57:04,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 16:57:04,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 16:57:04,489 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 16:57:04,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 16:57:04,536 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_back [2023-12-02 16:57:04,536 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_back [2023-12-02 16:57:04,536 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 16:57:04,536 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2023-12-02 16:57:04,536 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 16:57:04,536 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 16:57:04,536 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2023-12-02 16:57:04,536 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2023-12-02 16:57:04,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 16:57:04,537 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2023-12-02 16:57:04,537 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2023-12-02 16:57:04,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 16:57:04,537 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 16:57:04,537 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 16:57:04,537 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 16:57:04,538 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_empty [2023-12-02 16:57:04,538 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_empty [2023-12-02 16:57:04,538 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-12-02 16:57:04,538 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-12-02 16:57:04,538 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 16:57:04,538 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 16:57:04,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-12-02 16:57:04,539 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2023-12-02 16:57:04,539 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2023-12-02 16:57:04,539 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_prev_is_valid [2023-12-02 16:57:04,539 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_prev_is_valid [2023-12-02 16:57:04,762 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 16:57:04,764 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 16:57:05,121 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 16:57:05,162 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 16:57:05,162 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 16:57:05,163 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:57:05 BoogieIcfgContainer [2023-12-02 16:57:05,163 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 16:57:05,165 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 16:57:05,166 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 16:57:05,169 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 16:57:05,169 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 04:57:02" (1/3) ... [2023-12-02 16:57:05,170 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8da7249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:57:05, skipping insertion in model container [2023-12-02 16:57:05,170 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 04:57:04" (2/3) ... [2023-12-02 16:57:05,171 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8da7249 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 04:57:05, skipping insertion in model container [2023-12-02 16:57:05,171 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 04:57:05" (3/3) ... [2023-12-02 16:57:05,172 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_back_harness.i [2023-12-02 16:57:05,193 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 16:57:05,193 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 16:57:05,245 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 16:57:05,251 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;@5b7caa63, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 16:57:05,270 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 16:57:05,274 INFO L276 IsEmpty]: Start isEmpty. Operand has 87 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 54 states have internal predecessors, (72), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-12-02 16:57:05,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 16:57:05,286 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:05,287 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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 16:57:05,287 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:05,293 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:05,293 INFO L85 PathProgramCache]: Analyzing trace with hash -391324354, now seen corresponding path program 1 times [2023-12-02 16:57:05,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:05,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [52008499] [2023-12-02 16:57:05,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:05,311 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:05,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:05,339 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:05,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2023-12-02 16:57:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:05,607 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 1 conjunts are in the unsatisfiable core [2023-12-02 16:57:05,615 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:05,648 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2023-12-02 16:57:05,648 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:05,649 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:05,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [52008499] [2023-12-02 16:57:05,650 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [52008499] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:05,650 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:05,651 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 16:57:05,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634752794] [2023-12-02 16:57:05,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:05,656 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-12-02 16:57:05,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:05,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-12-02 16:57:05,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 16:57:05,683 INFO L87 Difference]: Start difference. First operand has 87 states, 53 states have (on average 1.3584905660377358) internal successors, (72), 54 states have internal predecessors, (72), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:57:05,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:05,772 INFO L93 Difference]: Finished difference Result 168 states and 251 transitions. [2023-12-02 16:57:05,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-12-02 16:57:05,775 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) Word has length 79 [2023-12-02 16:57:05,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:05,784 INFO L225 Difference]: With dead ends: 168 [2023-12-02 16:57:05,784 INFO L226 Difference]: Without dead ends: 85 [2023-12-02 16:57:05,788 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-12-02 16:57:05,792 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:05,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 16:57:05,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2023-12-02 16:57:05,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2023-12-02 16:57:05,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 52 states have (on average 1.2884615384615385) internal successors, (67), 53 states have internal predecessors, (67), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2023-12-02 16:57:05,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 114 transitions. [2023-12-02 16:57:05,841 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 114 transitions. Word has length 79 [2023-12-02 16:57:05,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:05,841 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 114 transitions. [2023-12-02 16:57:05,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 20.0) internal successors, (40), 2 states have internal predecessors, (40), 2 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 2 states have call predecessors, (10), 2 states have call successors, (10) [2023-12-02 16:57:05,842 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 114 transitions. [2023-12-02 16:57:05,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 16:57:05,847 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:05,847 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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 16:57:05,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2023-12-02 16:57:06,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:06,052 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:06,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:06,053 INFO L85 PathProgramCache]: Analyzing trace with hash 2013208190, now seen corresponding path program 1 times [2023-12-02 16:57:06,053 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:06,054 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2075653892] [2023-12-02 16:57:06,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:06,054 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:06,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:06,055 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:06,056 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2023-12-02 16:57:06,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:06,304 INFO L262 TraceCheckSpWp]: Trace formula consists of 218 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 16:57:06,310 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:06,382 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 16:57:06,382 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:06,383 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:06,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2075653892] [2023-12-02 16:57:06,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2075653892] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:06,384 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:06,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 16:57:06,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169541686] [2023-12-02 16:57:06,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:06,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 16:57:06,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:06,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 16:57:06,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 16:57:06,388 INFO L87 Difference]: Start difference. First operand 85 states and 114 transitions. Second operand has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:57:06,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:06,636 INFO L93 Difference]: Finished difference Result 157 states and 212 transitions. [2023-12-02 16:57:06,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 16:57:06,637 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 79 [2023-12-02 16:57:06,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:06,640 INFO L225 Difference]: With dead ends: 157 [2023-12-02 16:57:06,641 INFO L226 Difference]: Without dead ends: 87 [2023-12-02 16:57:06,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:57:06,643 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 2 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:06,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 483 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:57:06,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-12-02 16:57:06,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2023-12-02 16:57:06,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 55 states have internal predecessors, (68), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:06,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 117 transitions. [2023-12-02 16:57:06,659 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 117 transitions. Word has length 79 [2023-12-02 16:57:06,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:06,659 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 117 transitions. [2023-12-02 16:57:06,659 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.2) internal successors, (46), 5 states have internal predecessors, (46), 3 states have call successors, (13), 2 states have call predecessors, (13), 4 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2023-12-02 16:57:06,660 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 117 transitions. [2023-12-02 16:57:06,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2023-12-02 16:57:06,661 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:06,662 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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] [2023-12-02 16:57:06,667 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Ended with exit code 0 [2023-12-02 16:57:06,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:06,863 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:06,863 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:06,863 INFO L85 PathProgramCache]: Analyzing trace with hash 1709376450, now seen corresponding path program 1 times [2023-12-02 16:57:06,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:06,865 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2141627829] [2023-12-02 16:57:06,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:06,865 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:06,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:06,866 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:06,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2023-12-02 16:57:07,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:07,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 16:57:07,086 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:07,233 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:57:07,234 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:07,234 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:07,234 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2141627829] [2023-12-02 16:57:07,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2141627829] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:07,235 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:07,235 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:57:07,235 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401639797] [2023-12-02 16:57:07,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:07,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:57:07,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:07,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:57:07,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:57:07,237 INFO L87 Difference]: Start difference. First operand 87 states and 117 transitions. Second operand has 8 states, 7 states have (on average 6.428571428571429) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:07,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:07,703 INFO L93 Difference]: Finished difference Result 162 states and 219 transitions. [2023-12-02 16:57:07,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:57:07,704 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.428571428571429) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 81 [2023-12-02 16:57:07,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:07,706 INFO L225 Difference]: With dead ends: 162 [2023-12-02 16:57:07,707 INFO L226 Difference]: Without dead ends: 87 [2023-12-02 16:57:07,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-12-02 16:57:07,708 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 43 mSDsluCounter, 474 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 566 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:07,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 566 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:57:07,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-12-02 16:57:07,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2023-12-02 16:57:07,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 53 states have (on average 1.2641509433962264) internal successors, (67), 55 states have internal predecessors, (67), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:07,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 116 transitions. [2023-12-02 16:57:07,724 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 116 transitions. Word has length 81 [2023-12-02 16:57:07,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:07,725 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 116 transitions. [2023-12-02 16:57:07,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.428571428571429) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:07,725 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 116 transitions. [2023-12-02 16:57:07,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-12-02 16:57:07,727 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:07,727 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1] [2023-12-02 16:57:07,734 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (4)] Ended with exit code 0 [2023-12-02 16:57:07,934 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:07,934 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:07,935 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:07,935 INFO L85 PathProgramCache]: Analyzing trace with hash -582117835, now seen corresponding path program 1 times [2023-12-02 16:57:07,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:07,936 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [263250679] [2023-12-02 16:57:07,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:07,936 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:07,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:07,937 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:07,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2023-12-02 16:57:08,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:08,145 INFO L262 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:57:08,149 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:08,306 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-12-02 16:57:08,307 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:08,307 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:08,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [263250679] [2023-12-02 16:57:08,308 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [263250679] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:08,308 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:08,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-12-02 16:57:08,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432919316] [2023-12-02 16:57:08,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:08,309 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 16:57:08,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:08,310 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 16:57:08,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 16:57:08,311 INFO L87 Difference]: Start difference. First operand 87 states and 116 transitions. Second operand has 9 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:08,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:08,905 INFO L93 Difference]: Finished difference Result 169 states and 228 transitions. [2023-12-02 16:57:08,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 16:57:08,907 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 83 [2023-12-02 16:57:08,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:08,909 INFO L225 Difference]: With dead ends: 169 [2023-12-02 16:57:08,909 INFO L226 Difference]: Without dead ends: 93 [2023-12-02 16:57:08,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2023-12-02 16:57:08,911 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 65 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:08,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 635 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 16:57:08,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-12-02 16:57:08,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 88. [2023-12-02 16:57:08,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 56 states have internal predecessors, (68), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:08,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 117 transitions. [2023-12-02 16:57:08,926 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 117 transitions. Word has length 83 [2023-12-02 16:57:08,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:08,927 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 117 transitions. [2023-12-02 16:57:08,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.875) internal successors, (47), 8 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:08,927 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 117 transitions. [2023-12-02 16:57:08,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2023-12-02 16:57:08,929 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:08,929 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1, 1] [2023-12-02 16:57:08,936 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (5)] Ended with exit code 0 [2023-12-02 16:57:09,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:09,136 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:09,136 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:09,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1360780899, now seen corresponding path program 1 times [2023-12-02 16:57:09,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:09,137 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1918185024] [2023-12-02 16:57:09,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:09,137 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:09,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:09,138 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:09,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2023-12-02 16:57:09,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:09,330 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 16:57:09,334 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:09,484 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:57:09,484 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:09,484 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:09,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1918185024] [2023-12-02 16:57:09,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1918185024] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:09,485 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:09,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-12-02 16:57:09,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972915569] [2023-12-02 16:57:09,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:09,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:57:09,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:09,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:57:09,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-12-02 16:57:09,488 INFO L87 Difference]: Start difference. First operand 88 states and 117 transitions. Second operand has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:09,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:09,928 INFO L93 Difference]: Finished difference Result 165 states and 224 transitions. [2023-12-02 16:57:09,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:57:09,930 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 84 [2023-12-02 16:57:09,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:09,932 INFO L225 Difference]: With dead ends: 165 [2023-12-02 16:57:09,932 INFO L226 Difference]: Without dead ends: 92 [2023-12-02 16:57:09,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-12-02 16:57:09,934 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 49 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:09,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 469 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 16:57:09,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-12-02 16:57:09,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 89. [2023-12-02 16:57:09,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 55 states have (on average 1.2545454545454546) internal successors, (69), 57 states have internal predecessors, (69), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:09,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 118 transitions. [2023-12-02 16:57:09,954 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 118 transitions. Word has length 84 [2023-12-02 16:57:09,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:09,955 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 118 transitions. [2023-12-02 16:57:09,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 6.714285714285714) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) [2023-12-02 16:57:09,955 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 118 transitions. [2023-12-02 16:57:09,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2023-12-02 16:57:09,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:09,958 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:57:09,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2023-12-02 16:57:10,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:10,160 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:10,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:10,161 INFO L85 PathProgramCache]: Analyzing trace with hash 1090178347, now seen corresponding path program 1 times [2023-12-02 16:57:10,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:10,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [69666824] [2023-12-02 16:57:10,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:10,161 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:10,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:10,162 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:10,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2023-12-02 16:57:10,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:10,367 INFO L262 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 16:57:10,369 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:10,414 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 16:57:10,414 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:10,414 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:10,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [69666824] [2023-12-02 16:57:10,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [69666824] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:10,415 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 16:57:10,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 16:57:10,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715776639] [2023-12-02 16:57:10,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:10,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 16:57:10,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:10,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 16:57:10,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 16:57:10,417 INFO L87 Difference]: Start difference. First operand 89 states and 118 transitions. Second operand has 7 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 16:57:10,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:10,664 INFO L93 Difference]: Finished difference Result 166 states and 221 transitions. [2023-12-02 16:57:10,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 16:57:10,665 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 91 [2023-12-02 16:57:10,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:10,666 INFO L225 Difference]: With dead ends: 166 [2023-12-02 16:57:10,666 INFO L226 Difference]: Without dead ends: 92 [2023-12-02 16:57:10,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2023-12-02 16:57:10,667 INFO L413 NwaCegarLoop]: 101 mSDtfsCounter, 4 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 585 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:10,668 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 585 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 16:57:10,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-12-02 16:57:10,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 90. [2023-12-02 16:57:10,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 56 states have (on average 1.25) internal successors, (70), 58 states have internal predecessors, (70), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:10,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 119 transitions. [2023-12-02 16:57:10,682 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 119 transitions. Word has length 91 [2023-12-02 16:57:10,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:10,682 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 119 transitions. [2023-12-02 16:57:10,683 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 9.333333333333334) internal successors, (56), 6 states have internal predecessors, (56), 3 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 16:57:10,683 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 119 transitions. [2023-12-02 16:57:10,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 16:57:10,684 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:10,684 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:57:10,690 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (7)] Ended with exit code 0 [2023-12-02 16:57:10,887 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:10,887 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:10,888 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:10,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1368959326, now seen corresponding path program 1 times [2023-12-02 16:57:10,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:10,888 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1508081615] [2023-12-02 16:57:10,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:10,889 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:10,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:10,889 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:10,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2023-12-02 16:57:11,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:11,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 16:57:11,152 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:13,754 WARN L876 $PredicateComparison]: unable to prove that (or (exists ((|v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.base_BEFORE_CALL_1| (_ BitVec 64)) (|v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.offset_BEFORE_CALL_1| (_ BitVec 64))) (not (= (_ bv0 64) (select (select |c_#memory_$Pointer$.offset| |v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.base_BEFORE_CALL_1|) |v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.offset_BEFORE_CALL_1|)))) (exists ((|v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.base_BEFORE_CALL_1| (_ BitVec 64)) (|v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.offset_BEFORE_CALL_1| (_ BitVec 64))) (not (= (_ bv0 64) (select (select |c_#memory_$Pointer$.base| |v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.base_BEFORE_CALL_1|) |v_aws_linked_list_is_valid_aws_linked_list_is_valid_deep_~temp~0#1.offset_BEFORE_CALL_1|))))) is different from true [2023-12-02 16:57:13,989 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 49 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 16:57:13,989 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:57:14,448 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2023-12-02 16:57:14,448 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:14,448 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1508081615] [2023-12-02 16:57:14,449 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1508081615] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:57:14,449 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2107832508] [2023-12-02 16:57:14,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:14,449 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-12-02 16:57:14,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 [2023-12-02 16:57:14,450 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-12-02 16:57:14,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2023-12-02 16:57:14,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:14,671 INFO L262 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 16:57:14,674 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:14,872 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 16:57:14,872 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 16:57:14,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2107832508] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 16:57:14,872 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 16:57:14,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10, 8] total 22 [2023-12-02 16:57:14,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812816707] [2023-12-02 16:57:14,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 16:57:14,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 16:57:14,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2023-12-02 16:57:14,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 16:57:14,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=369, Unknown=1, NotChecked=38, Total=462 [2023-12-02 16:57:14,875 INFO L87 Difference]: Start difference. First operand 90 states and 119 transitions. Second operand has 8 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 16:57:15,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 16:57:15,215 INFO L93 Difference]: Finished difference Result 171 states and 227 transitions. [2023-12-02 16:57:15,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 16:57:15,216 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 93 [2023-12-02 16:57:15,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 16:57:15,218 INFO L225 Difference]: With dead ends: 171 [2023-12-02 16:57:15,218 INFO L226 Difference]: Without dead ends: 96 [2023-12-02 16:57:15,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 255 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=66, Invalid=489, Unknown=1, NotChecked=44, Total=600 [2023-12-02 16:57:15,220 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 6 mSDsluCounter, 571 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 671 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 16:57:15,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 671 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 16:57:15,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-12-02 16:57:15,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2023-12-02 16:57:15,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 57 states have (on average 1.2456140350877194) internal successors, (71), 59 states have internal predecessors, (71), 24 states have call successors, (24), 8 states have call predecessors, (24), 9 states have return successors, (25), 23 states have call predecessors, (25), 23 states have call successors, (25) [2023-12-02 16:57:15,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 120 transitions. [2023-12-02 16:57:15,233 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 120 transitions. Word has length 93 [2023-12-02 16:57:15,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 16:57:15,233 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 120 transitions. [2023-12-02 16:57:15,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 8.285714285714286) internal successors, (58), 7 states have internal predecessors, (58), 4 states have call successors, (14), 2 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-12-02 16:57:15,234 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 120 transitions. [2023-12-02 16:57:15,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2023-12-02 16:57:15,235 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 16:57:15,235 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 16:57:15,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (8)] Ended with exit code 0 [2023-12-02 16:57:15,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (9)] Ended with exit code 0 [2023-12-02 16:57:15,636 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt [2023-12-02 16:57:15,636 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 16:57:15,636 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 16:57:15,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1006931052, now seen corresponding path program 1 times [2023-12-02 16:57:15,637 INFO L118 FreeRefinementEngine]: Executing refinement strategy WALRUS [2023-12-02 16:57:15,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [385222149] [2023-12-02 16:57:15,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:15,637 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2023-12-02 16:57:15,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat [2023-12-02 16:57:15,638 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2023-12-02 16:57:15,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2023-12-02 16:57:15,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:15,831 INFO L262 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 28 conjunts are in the unsatisfiable core [2023-12-02 16:57:15,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:18,261 WARN L876 $PredicateComparison]: unable to prove that (or (exists ((v_aws_linked_list_back_~list.base_BEFORE_CALL_4 (_ BitVec 64))) (not (= (select (select |c_#memory_$Pointer$.offset| v_aws_linked_list_back_~list.base_BEFORE_CALL_4) (_ bv0 64)) (_ bv16 64)))) (exists ((v_aws_linked_list_back_~list.base_BEFORE_CALL_4 (_ BitVec 64))) (not (= v_aws_linked_list_back_~list.base_BEFORE_CALL_4 (select (select |c_#memory_$Pointer$.base| v_aws_linked_list_back_~list.base_BEFORE_CALL_4) (_ bv0 64)))))) is different from true [2023-12-02 16:57:19,585 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 57 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 16:57:19,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 16:57:25,093 INFO L349 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2023-12-02 16:57:25,094 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 26 treesize of output 25 [2023-12-02 16:57:25,112 INFO L349 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2023-12-02 16:57:25,112 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 24 treesize of output 16 [2023-12-02 16:57:25,134 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2023-12-02 16:57:25,134 INFO L136 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2023-12-02 16:57:25,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [385222149] [2023-12-02 16:57:25,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [385222149] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 16:57:25,134 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1704895518] [2023-12-02 16:57:25,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 16:57:25,135 INFO L173 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2023-12-02 16:57:25,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 [2023-12-02 16:57:25,136 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2023-12-02 16:57:25,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e728ac89-f69c-49e1-99fe-db84eb6bcbd9/bin/utaipan-verify-nQ1chXbOIh/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2023-12-02 16:57:25,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 16:57:25,580 INFO L262 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 27 conjunts are in the unsatisfiable core [2023-12-02 16:57:25,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 16:57:25,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-12-02 16:57:25,742 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 22 [2023-12-02 16:57:25,754 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 32 treesize of output 40 [2023-12-02 16:57:25,767 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 64 treesize of output 29 [2023-12-02 16:57:25,774 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 1 [2023-12-02 16:57:25,781 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 16:57:25,827 INFO L349 Elim1Store]: treesize reduction 39, result has 25.0 percent of original size [2023-12-02 16:57:25,827 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 1 case distinctions, treesize of input 22 treesize of output 23 [2023-12-02 16:57:25,835 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 0 case distinctions, treesize of input 17 treesize of output 20 [2023-12-02 16:57:25,838 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 8 treesize of output 1