./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire --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 52acad1f86dde00e055ff68c84610663a6ee1e8b549596d6f4e68b872dd717ff --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:29:54,058 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:29:54,127 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-11-23 21:29:54,133 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:29:54,134 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:29:54,160 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:29:54,161 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:29:54,162 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:29:54,163 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:29:54,163 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:29:54,164 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:29:54,165 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:29:54,165 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:29:54,166 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:29:54,167 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:29:54,167 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:29:54,168 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:29:54,169 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:29:54,169 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:29:54,170 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:29:54,175 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:29:54,176 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:29:54,177 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:29:54,177 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:29:54,178 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:29:54,179 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:29:54,179 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:29:54,180 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:29:54,180 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:29:54,181 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:29:54,181 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:29:54,182 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:29:54,182 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:29:54,183 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:29:54,183 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:29:54,184 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:29:54,184 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:29:54,185 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:29:54,185 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:29:54,186 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:29:54,187 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:29:54,187 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:29:54,188 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:29:54,188 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:29:54,189 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_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 52acad1f86dde00e055ff68c84610663a6ee1e8b549596d6f4e68b872dd717ff [2023-11-23 21:29:54,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:29:54,505 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:29:54,508 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:29:54,512 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:29:54,513 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:29:54,515 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i [2023-11-23 21:29:57,617 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:29:58,187 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:29:58,188 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i [2023-11-23 21:29:58,234 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/data/7cbc6a548/b484017c95094fbeaa4a3ef3dc9a44aa/FLAGd3b78f279 [2023-11-23 21:29:58,254 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/data/7cbc6a548/b484017c95094fbeaa4a3ef3dc9a44aa [2023-11-23 21:29:58,261 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:29:58,264 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:29:58,269 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:29:58,269 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:29:58,274 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:29:58,275 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:29:58" (1/1) ... [2023-11-23 21:29:58,276 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21b45d47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:58, skipping insertion in model container [2023-11-23 21:29:58,276 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:29:58" (1/1) ... [2023-11-23 21:29:58,397 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:29:58,769 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_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i[4495,4508] [2023-11-23 21:29:58,777 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_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i[4555,4568] [2023-11-23 21:29:59,565 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,566 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,567 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,568 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,569 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,594 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,595 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,598 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,600 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,603 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,604 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,605 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:29:59,605 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,045 WARN L635 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-11-23 21:30:00,046 WARN L635 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-11-23 21:30:00,048 WARN L635 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-11-23 21:30:00,049 WARN L635 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-11-23 21:30:00,054 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-11-23 21:30:00,055 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-11-23 21:30:00,056 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-11-23 21:30:00,059 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-11-23 21:30:00,060 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-11-23 21:30:00,061 WARN L635 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-11-23 21:30:00,316 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:30:00,338 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:30:00,365 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_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i[4495,4508] [2023-11-23 21:30:00,365 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_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/sv-benchmarks/c/aws-c-common/aws_linked_list_begin_harness_negated.i[4555,4568] [2023-11-23 21:30:00,440 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,441 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,441 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,442 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,443 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,455 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,455 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,457 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,457 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,459 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,460 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,460 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,461 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:30:00,503 WARN L635 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-11-23 21:30:00,505 WARN L635 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-11-23 21:30:00,505 WARN L635 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-11-23 21:30:00,507 WARN L635 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-11-23 21:30:00,508 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-11-23 21:30:00,508 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-11-23 21:30:00,509 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-11-23 21:30:00,510 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-11-23 21:30:00,511 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-11-23 21:30:00,511 WARN L635 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-11-23 21:30:00,550 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:30:00,776 WARN L675 CHandler]: The function __atomic_fetch_or is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,776 WARN L675 CHandler]: The function __atomic_fetch_sub is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,777 WARN L675 CHandler]: The function __atomic_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,777 WARN L675 CHandler]: The function __atomic_fetch_xor is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,777 WARN L675 CHandler]: The function htons is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,777 WARN L675 CHandler]: The function ntohl is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,777 WARN L675 CHandler]: The function __atomic_compare_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function __atomic_fetch_add is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function htonl is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function __atomic_store_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function ntohs is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function __atomic_load_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,778 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,779 WARN L675 CHandler]: The function __atomic_thread_fence is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,779 WARN L675 CHandler]: The function __atomic_fetch_and is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,779 WARN L675 CHandler]: The function aws_array_list_ensure_capacity is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:30:00,787 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:30:00,787 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00 WrapperNode [2023-11-23 21:30:00,788 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:30:00,789 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:30:00,789 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:30:00,789 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:30:00,797 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:00,939 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,007 INFO L138 Inliner]: procedures = 678, calls = 1041, calls flagged for inlining = 52, calls inlined = 6, statements flattened = 141 [2023-11-23 21:30:01,009 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:30:01,010 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:30:01,010 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:30:01,010 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:30:01,019 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,020 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,034 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,035 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,054 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,073 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,082 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,084 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,097 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:30:01,098 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:30:01,099 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:30:01,100 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:30:01,100 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (1/1) ... [2023-11-23 21:30:01,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:30:01,117 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:01,135 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:30:01,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:30:01,188 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:30:01,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 21:30:01,189 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 21:30:01,189 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2023-11-23 21:30:01,189 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2023-11-23 21:30:01,189 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:30:01,189 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2023-11-23 21:30:01,190 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2023-11-23 21:30:01,190 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:30:01,190 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:30:01,191 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:30:01,191 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:30:01,191 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 21:30:01,191 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 21:30:01,191 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:30:01,192 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:30:01,192 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:30:01,192 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2023-11-23 21:30:01,192 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2023-11-23 21:30:01,192 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:30:01,499 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:30:01,501 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:30:01,764 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:30:01,990 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:30:01,990 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:30:01,992 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:30:01 BoogieIcfgContainer [2023-11-23 21:30:01,992 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:30:01,996 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:30:01,996 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:30:02,000 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:30:02,000 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:29:58" (1/3) ... [2023-11-23 21:30:02,002 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1efb4e31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:30:02, skipping insertion in model container [2023-11-23 21:30:02,002 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:30:00" (2/3) ... [2023-11-23 21:30:02,006 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1efb4e31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:30:02, skipping insertion in model container [2023-11-23 21:30:02,006 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:30:01" (3/3) ... [2023-11-23 21:30:02,008 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_begin_harness_negated.i [2023-11-23 21:30:02,029 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:30:02,029 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:30:02,104 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:30:02,118 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;@3eeb1bf8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:30:02,118 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:30:02,123 INFO L276 IsEmpty]: Start isEmpty. Operand has 46 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 27 states have internal predecessors, (34), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-11-23 21:30:02,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-23 21:30:02,134 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:02,135 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:02,136 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:02,146 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:02,146 INFO L85 PathProgramCache]: Analyzing trace with hash 732081457, now seen corresponding path program 1 times [2023-11-23 21:30:02,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:02,158 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1737592313] [2023-11-23 21:30:02,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:02,159 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:02,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:30:03,003 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:03,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1737592313] [2023-11-23 21:30:03,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1737592313] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:03,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895356614] [2023-11-23 21:30:03,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:03,005 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:03,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:03,010 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:03,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:30:03,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:03,246 INFO L262 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 60 conjunts are in the unsatisfiable core [2023-11-23 21:30:03,262 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:03,489 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 [2023-11-23 21:30:03,506 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 [2023-11-23 21:30:03,625 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 [2023-11-23 21:30:03,653 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 [2023-11-23 21:30:06,323 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:30:06,324 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:30:06,324 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895356614] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:06,324 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:30:06,324 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [5] total 12 [2023-11-23 21:30:06,327 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438674977] [2023-11-23 21:30:06,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:06,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:30:06,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:06,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:30:06,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:30:06,366 INFO L87 Difference]: Start difference. First operand has 46 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 27 states have internal predecessors, (34), 13 states have call successors, (13), 5 states have call predecessors, (13), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-23 21:30:07,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:07,069 INFO L93 Difference]: Finished difference Result 124 states and 173 transitions. [2023-11-23 21:30:07,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:30:07,073 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 37 [2023-11-23 21:30:07,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:07,081 INFO L225 Difference]: With dead ends: 124 [2023-11-23 21:30:07,083 INFO L226 Difference]: Without dead ends: 81 [2023-11-23 21:30:07,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:30:07,096 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 33 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:07,100 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 244 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:30:07,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-23 21:30:07,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2023-11-23 21:30:07,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 45 states have (on average 1.288888888888889) internal successors, (58), 47 states have internal predecessors, (58), 24 states have call successors, (24), 9 states have call predecessors, (24), 9 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-11-23 21:30:07,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 104 transitions. [2023-11-23 21:30:07,191 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 104 transitions. Word has length 37 [2023-11-23 21:30:07,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:07,192 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 104 transitions. [2023-11-23 21:30:07,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 9 states have internal predecessors, (18), 4 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2023-11-23 21:30:07,192 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 104 transitions. [2023-11-23 21:30:07,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2023-11-23 21:30:07,198 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:07,198 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:07,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:07,420 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-23 21:30:07,420 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:07,421 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:07,421 INFO L85 PathProgramCache]: Analyzing trace with hash 327259007, now seen corresponding path program 1 times [2023-11-23 21:30:07,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:07,421 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192298303] [2023-11-23 21:30:07,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:07,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:07,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:07,795 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:30:07,795 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:07,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192298303] [2023-11-23 21:30:07,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192298303] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:07,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286836374] [2023-11-23 21:30:07,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:07,796 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:07,796 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:07,797 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:07,822 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:30:07,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:07,992 INFO L262 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 67 conjunts are in the unsatisfiable core [2023-11-23 21:30:08,004 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:08,104 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 [2023-11-23 21:30:08,116 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 [2023-11-23 21:30:08,202 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 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 [2023-11-23 21:30:08,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:08,210 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 [2023-11-23 21:30:08,224 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 [2023-11-23 21:30:08,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:08,233 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 [2023-11-23 21:30:08,350 INFO L349 Elim1Store]: treesize reduction 38, result has 22.4 percent of original size [2023-11-23 21:30:08,352 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 121 treesize of output 121 [2023-11-23 21:30:08,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:08,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:08,366 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 35 treesize of output 30 [2023-11-23 21:30:08,371 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 [2023-11-23 21:30:08,403 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 74 [2023-11-23 21:30:16,172 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:30:16,172 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:20,205 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse3 (+ |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset| 16)) (.cse2 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|)) (.cse1 (+ |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset| 24)) (.cse5 (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|)) (.cse7 (+ |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset| 8))) (and (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0) (forall ((v_ArrVal_183 (Array Int Int))) (= (select (select (let ((.cse0 (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_183))) (store .cse0 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse0 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse3) 0)))) (or (not (= |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base| 0)) (not (= |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (or (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16| Int) (v_ArrVal_184 Int) (v_ArrVal_185 (Array Int Int))) (= (select (select (let ((.cse4 (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse5 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_185))) (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_184))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse3) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (forall ((v_ArrVal_183 (Array Int Int))) (= (select (select (let ((.cse6 (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_183))) (store .cse6 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse6 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse7) 0)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16| Int) (v_ArrVal_184 Int) (v_ArrVal_185 (Array Int Int))) (not (= (select (select (let ((.cse8 (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse5 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_185))) (store .cse8 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse8 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_184))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset|) 0))) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0) (forall ((v_ArrVal_183 (Array Int Int))) (not (= (select (select (let ((.cse9 (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_183))) (store .cse9 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse9 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset|) 0))))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (let ((.cse11 (+ |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.offset| 24))) (or (forall ((v_ArrVal_183 (Array Int Int))) (not (= (select (select (let ((.cse10 (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse2 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_183))) (store .cse10 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse10 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24|))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse11) 0))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16| Int) (v_ArrVal_184 Int) (v_ArrVal_185 (Array Int Int))) (not (= (select (select (let ((.cse12 (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse5 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_185))) (store .cse12 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse12 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_184))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse11) 0))) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0)))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 1)) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16| Int) (v_ArrVal_184 Int) (v_ArrVal_185 (Array Int Int))) (= (select (select (let ((.cse13 (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse5 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~node~0#1.offset_16|)) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| v_ArrVal_185))) (store .cse13 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select .cse13 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_184))) |c_ULTIMATE.start_aws_linked_list_begin_harness_~#list~0#1.base|) .cse7) 0)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_24| 0))))) is different from false [2023-11-23 21:30:20,362 INFO L349 Elim1Store]: treesize reduction 88, result has 44.7 percent of original size [2023-11-23 21:30:20,362 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 4 case distinctions, treesize of input 116 treesize of output 144 [2023-11-23 21:30:20,390 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:30:20,390 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 [2023-11-23 21:30:20,410 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 [2023-11-23 21:30:20,474 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 [2023-11-23 21:30:20,643 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:30:20,644 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 60 treesize of output 66 [2023-11-23 21:30:20,790 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:20,805 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:30:20,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 47 [2023-11-23 21:30:20,815 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:20,829 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:30:20,830 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 36 treesize of output 47 [2023-11-23 21:30:20,840 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 113 treesize of output 93 [2023-11-23 21:30:20,850 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,851 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,852 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,853 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 76 [2023-11-23 21:30:20,863 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,867 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 30 [2023-11-23 21:30:20,876 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,877 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,878 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 27 [2023-11-23 21:30:20,891 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 39 treesize of output 35 [2023-11-23 21:30:20,907 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:20,912 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,913 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,917 INFO L349 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2023-11-23 21:30:20,918 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 1 [2023-11-23 21:30:20,923 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,924 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,927 WARN L214 Elim1Store]: Array PQE input equivalent to true [2023-11-23 21:30:20,932 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:20,937 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,938 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,943 INFO L349 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2023-11-23 21:30:20,943 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 1 [2023-11-23 21:30:20,953 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:20,958 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,980 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 21:30:20,988 INFO L349 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2023-11-23 21:30:20,989 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 35 treesize of output 1 [2023-11-23 21:30:21,182 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 1 not checked. [2023-11-23 21:30:21,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [286836374] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:30:21,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327921958] [2023-11-23 21:30:21,205 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2023-11-23 21:30:21,206 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:21,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:21,215 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:21,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:27,545 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 68 for LOIs [2023-11-23 21:30:27,611 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 17 for LOIs [2023-11-23 21:30:27,614 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 94 for LOIs [2023-11-23 21:30:27,632 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:29,540 WARN L876 $PredicateComparison]: unable to prove that (and (exists ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~i~1#1_27| Int) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~length~1#1_19| Int)) (<= (mod |v_ULTIMATE.start_ensure_linked_list_is_allocated_~length~1#1_19| 18446744073709551616) (mod |v_ULTIMATE.start_ensure_linked_list_is_allocated_~i~1#1_27| 18446744073709551616))) (exists ((|v_#memory_int_30| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_72| (Array Int (Array Int Int))) (|v_#memory_real_47| (Array Int (Array Int Real))) (|v_#memory_real_27| (Array Int (Array Int Real))) (|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int))) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18| Int) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| Int) (|v_#memory_int_50| (Array Int (Array Int Int)))) (let ((.cse1 (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18| 24))) (let ((.cse2 (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)) (.cse3 (select (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1))) (and (= (let ((.cse0 (store |v_#memory_$Pointer$.base_72| .cse2 (store (select |v_#memory_$Pointer$.base_72| .cse2) .cse3 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|)))) (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 .cse2))) |c_#memory_$Pointer$.base|) (= |c_#memory_real| (store |v_#memory_real_27| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select |v_#memory_real_27| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 (select (select |c_#memory_real| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)))) (= (let ((.cse4 (store |v_#memory_$Pointer$.offset_72| .cse2 (store (select |v_#memory_$Pointer$.offset_72| .cse2) .cse3 (+ 16 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18|))))) (store .cse4 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select .cse4 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 .cse3))) |c_#memory_$Pointer$.offset|) (= (store |v_#memory_int_50| .cse2 (store (select |v_#memory_int_50| .cse2) .cse3 (select (select |v_#memory_int_30| .cse2) .cse3))) |v_#memory_int_30|) (= |c_#memory_int| (store |v_#memory_int_30| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select |v_#memory_int_30| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 (select (select |c_#memory_int| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)))) (= |v_#memory_real_27| (store |v_#memory_real_47| .cse2 (store (select |v_#memory_real_47| .cse2) .cse3 (select (select |v_#memory_real_27| .cse2) .cse3))))))))) is different from true [2023-11-23 21:30:29,553 WARN L876 $PredicateComparison]: unable to prove that (and (exists ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~i~1#1_27| Int) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~length~1#1_19| Int)) (<= (mod |v_ULTIMATE.start_ensure_linked_list_is_allocated_~length~1#1_19| 18446744073709551616) (mod |v_ULTIMATE.start_ensure_linked_list_is_allocated_~i~1#1_27| 18446744073709551616))) (exists ((|v_#memory_$Pointer$.offset_72| (Array Int (Array Int Int))) (|v_#memory_int_30| (Array Int (Array Int Int))) (|v_#memory_real_47| (Array Int (Array Int Real))) (|v_#memory_real_27| (Array Int (Array Int Real))) (|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int))) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18| Int) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| Int) (|v_#memory_int_50| (Array Int (Array Int Int)))) (let ((.cse1 (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18| 24))) (let ((.cse2 (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)) (.cse3 (select (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1))) (and (= (let ((.cse0 (store |v_#memory_$Pointer$.base_72| .cse2 (store (select |v_#memory_$Pointer$.base_72| .cse2) .cse3 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|)))) (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 .cse2))) |c_#memory_$Pointer$.base|) (= |c_#memory_real| (store |v_#memory_real_27| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select |v_#memory_real_27| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 (select (select |c_#memory_real| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)))) (= (let ((.cse4 (store |v_#memory_$Pointer$.offset_72| .cse2 (store (select |v_#memory_$Pointer$.offset_72| .cse2) .cse3 (+ 16 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_18|))))) (store .cse4 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select .cse4 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 .cse3))) |c_#memory_$Pointer$.offset|) (= (store |v_#memory_int_50| .cse2 (store (select |v_#memory_int_50| .cse2) .cse3 (select (select |v_#memory_int_30| .cse2) .cse3))) |v_#memory_int_30|) (= |c_#memory_int| (store |v_#memory_int_30| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18| (store (select |v_#memory_int_30| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1 (select (select |c_#memory_int| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_18|) .cse1)))) (= |v_#memory_real_27| (store |v_#memory_real_47| .cse2 (store (select |v_#memory_real_47| .cse2) .cse3 (select (select |v_#memory_real_27| .cse2) .cse3))))))))) is different from true [2023-11-23 21:30:29,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [327921958] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:29,853 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:30:29,853 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [5, 18, 9] total 37 [2023-11-23 21:30:29,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531201486] [2023-11-23 21:30:29,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:29,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:30:29,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:29,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:30:29,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=949, Unknown=52, NotChecked=198, Total=1332 [2023-11-23 21:30:29,857 INFO L87 Difference]: Start difference. First operand 79 states and 104 transitions. Second operand has 11 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 21:30:30,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:30,886 INFO L93 Difference]: Finished difference Result 122 states and 158 transitions. [2023-11-23 21:30:30,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 21:30:30,887 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 38 [2023-11-23 21:30:30,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:30,890 INFO L225 Difference]: With dead ends: 122 [2023-11-23 21:30:30,891 INFO L226 Difference]: Without dead ends: 85 [2023-11-23 21:30:30,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=146, Invalid=1074, Unknown=52, NotChecked=210, Total=1482 [2023-11-23 21:30:30,893 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 1 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 152 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:30,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 201 Invalid, 237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 80 Invalid, 1 Unknown, 152 Unchecked, 0.6s Time] [2023-11-23 21:30:30,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2023-11-23 21:30:30,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2023-11-23 21:30:30,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 47 states have (on average 1.2765957446808511) internal successors, (60), 50 states have internal predecessors, (60), 24 states have call successors, (24), 10 states have call predecessors, (24), 11 states have return successors, (25), 22 states have call predecessors, (25), 22 states have call successors, (25) [2023-11-23 21:30:30,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 109 transitions. [2023-11-23 21:30:30,920 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 109 transitions. Word has length 38 [2023-11-23 21:30:30,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:30,921 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 109 transitions. [2023-11-23 21:30:30,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 4 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2023-11-23 21:30:30,921 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 109 transitions. [2023-11-23 21:30:30,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-23 21:30:30,923 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:30,924 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:30,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:31,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:31,138 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:31,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:31,139 INFO L85 PathProgramCache]: Analyzing trace with hash -782356197, now seen corresponding path program 1 times [2023-11-23 21:30:31,139 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:31,139 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242305430] [2023-11-23 21:30:31,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:31,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:31,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:31,419 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:30:31,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:31,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242305430] [2023-11-23 21:30:31,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242305430] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:31,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087547160] [2023-11-23 21:30:31,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:31,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:31,421 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:31,426 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:31,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:30:31,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:31,645 INFO L262 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 21:30:31,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:31,736 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:30:31,736 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:30:31,737 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087547160] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:31,737 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:30:31,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2023-11-23 21:30:31,737 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086500366] [2023-11-23 21:30:31,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:31,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:30:31,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:31,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:30:31,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2023-11-23 21:30:31,741 INFO L87 Difference]: Start difference. First operand 83 states and 109 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:31,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:31,980 INFO L93 Difference]: Finished difference Result 159 states and 213 transitions. [2023-11-23 21:30:31,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:30:31,981 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 40 [2023-11-23 21:30:31,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:31,984 INFO L225 Difference]: With dead ends: 159 [2023-11-23 21:30:31,984 INFO L226 Difference]: Without dead ends: 89 [2023-11-23 21:30:31,985 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:30:31,987 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 28 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:31,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 154 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:30:31,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-23 21:30:32,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2023-11-23 21:30:32,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 51 states have (on average 1.2549019607843137) internal successors, (64), 56 states have internal predecessors, (64), 24 states have call successors, (24), 10 states have call predecessors, (24), 13 states have return successors, (29), 22 states have call predecessors, (29), 22 states have call successors, (29) [2023-11-23 21:30:32,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 117 transitions. [2023-11-23 21:30:32,017 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 117 transitions. Word has length 40 [2023-11-23 21:30:32,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:32,017 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 117 transitions. [2023-11-23 21:30:32,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:32,018 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 117 transitions. [2023-11-23 21:30:32,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-11-23 21:30:32,020 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:32,021 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:32,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:32,242 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:32,242 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:32,243 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:32,243 INFO L85 PathProgramCache]: Analyzing trace with hash -1156903453, now seen corresponding path program 1 times [2023-11-23 21:30:32,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:32,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183784945] [2023-11-23 21:30:32,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:32,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:32,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:32,547 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:30:32,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:32,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183784945] [2023-11-23 21:30:32,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183784945] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:32,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753229828] [2023-11-23 21:30:32,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:32,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:32,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:32,550 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:32,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:30:32,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:32,757 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-23 21:30:32,761 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:32,869 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:30:32,869 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:30:32,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753229828] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:32,870 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:30:32,870 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2023-11-23 21:30:32,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529098183] [2023-11-23 21:30:32,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:32,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:30:32,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:32,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:30:32,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:30:32,872 INFO L87 Difference]: Start difference. First operand 89 states and 117 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:33,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:33,160 INFO L93 Difference]: Finished difference Result 185 states and 251 transitions. [2023-11-23 21:30:33,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:30:33,161 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 42 [2023-11-23 21:30:33,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:33,163 INFO L225 Difference]: With dead ends: 185 [2023-11-23 21:30:33,164 INFO L226 Difference]: Without dead ends: 109 [2023-11-23 21:30:33,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:30:33,179 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 52 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:33,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 181 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:30:33,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-23 21:30:33,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 93. [2023-11-23 21:30:33,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 60 states have internal predecessors, (70), 24 states have call successors, (24), 10 states have call predecessors, (24), 13 states have return successors, (29), 22 states have call predecessors, (29), 22 states have call successors, (29) [2023-11-23 21:30:33,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 123 transitions. [2023-11-23 21:30:33,227 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 123 transitions. Word has length 42 [2023-11-23 21:30:33,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:33,228 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 123 transitions. [2023-11-23 21:30:33,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:33,228 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 123 transitions. [2023-11-23 21:30:33,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-23 21:30:33,242 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:33,242 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:33,271 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:33,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:33,462 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:33,463 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:33,463 INFO L85 PathProgramCache]: Analyzing trace with hash 1006334099, now seen corresponding path program 1 times [2023-11-23 21:30:33,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:33,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250864391] [2023-11-23 21:30:33,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:33,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:33,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:33,800 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:30:33,800 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:33,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250864391] [2023-11-23 21:30:33,800 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250864391] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:33,801 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933547859] [2023-11-23 21:30:33,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:33,801 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:33,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:33,806 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:33,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:30:34,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:34,004 INFO L262 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:30:34,006 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:34,026 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:30:34,026 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:30:34,026 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933547859] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:34,026 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:30:34,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2023-11-23 21:30:34,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365665536] [2023-11-23 21:30:34,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:34,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:30:34,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:34,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:30:34,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:30:34,029 INFO L87 Difference]: Start difference. First operand 93 states and 123 transitions. Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:34,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:34,122 INFO L93 Difference]: Finished difference Result 183 states and 253 transitions. [2023-11-23 21:30:34,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:30:34,123 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 43 [2023-11-23 21:30:34,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:34,131 INFO L225 Difference]: With dead ends: 183 [2023-11-23 21:30:34,131 INFO L226 Difference]: Without dead ends: 103 [2023-11-23 21:30:34,132 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:30:34,133 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 4 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:34,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:30:34,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-23 21:30:34,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 95. [2023-11-23 21:30:34,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.263157894736842) internal successors, (72), 62 states have internal predecessors, (72), 24 states have call successors, (24), 10 states have call predecessors, (24), 13 states have return successors, (29), 22 states have call predecessors, (29), 22 states have call successors, (29) [2023-11-23 21:30:34,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 125 transitions. [2023-11-23 21:30:34,167 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 125 transitions. Word has length 43 [2023-11-23 21:30:34,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:34,171 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 125 transitions. [2023-11-23 21:30:34,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-23 21:30:34,171 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 125 transitions. [2023-11-23 21:30:34,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-11-23 21:30:34,174 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:34,174 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:34,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:34,390 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:34,390 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:30:34,390 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:34,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1652538714, now seen corresponding path program 1 times [2023-11-23 21:30:34,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:34,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919861022] [2023-11-23 21:30:34,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:34,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:34,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 21:30:34,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:34,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919861022] [2023-11-23 21:30:34,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919861022] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:34,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372009326] [2023-11-23 21:30:34,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:34,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:34,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:34,715 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:34,717 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d8bb8b2-7703-4292-9cc8-30d3ca390e32/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:30:34,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:34,950 INFO L262 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 89 conjunts are in the unsatisfiable core [2023-11-23 21:30:34,957 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:35,073 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 [2023-11-23 21:30:35,092 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 [2023-11-23 21:30:35,176 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 [2023-11-23 21:30:35,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:35,183 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 [2023-11-23 21:30:35,196 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 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 [2023-11-23 21:30:35,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:35,204 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 [2023-11-23 21:30:35,320 INFO L349 Elim1Store]: treesize reduction 38, result has 22.4 percent of original size [2023-11-23 21:30:35,321 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 121 treesize of output 121 [2023-11-23 21:30:35,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:35,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:35,333 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 35 treesize of output 30 [2023-11-23 21:30:35,343 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 88 treesize of output 82 [2023-11-23 21:30:35,373 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