./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/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_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/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_054653ce-225b-49fb-a9b8-468dcb36d276/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 5094ef48f22f1fe1203446e11fcea69068fe32fb7efd9beaaef32a9ae7a4548b --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:24:02,961 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:24:03,070 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-64bit-Taipan_Default.epf [2023-11-23 21:24:03,083 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:24:03,084 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:24:03,137 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:24:03,138 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:24:03,139 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:24:03,140 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:24:03,145 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:24:03,146 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:24:03,146 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:24:03,157 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:24:03,160 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:24:03,160 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:24:03,161 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:24:03,161 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:24:03,162 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:24:03,162 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:24:03,163 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:24:03,163 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:24:03,164 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:24:03,165 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:24:03,166 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:24:03,166 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:24:03,167 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:24:03,167 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:24:03,168 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:24:03,168 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:24:03,169 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:24:03,170 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:24:03,170 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:24:03,171 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:24:03,171 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:24:03,171 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:24:03,172 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:24:03,172 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:24:03,172 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:24:03,173 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:24:03,173 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:24:03,173 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:24:03,174 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:24:03,174 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:24:03,174 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:24:03,175 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_054653ce-225b-49fb-a9b8-468dcb36d276/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5094ef48f22f1fe1203446e11fcea69068fe32fb7efd9beaaef32a9ae7a4548b [2023-11-23 21:24:03,492 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:24:03,522 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:24:03,525 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:24:03,527 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:24:03,527 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:24:03,529 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i [2023-11-23 21:24:06,666 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:24:07,174 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:24:07,174 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i [2023-11-23 21:24:07,221 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/data/4933dbd82/20d45051d91848e0b555bf257f8053f9/FLAGa90cc2988 [2023-11-23 21:24:07,244 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/data/4933dbd82/20d45051d91848e0b555bf257f8053f9 [2023-11-23 21:24:07,247 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:24:07,252 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:24:07,254 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:24:07,254 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:24:07,259 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:24:07,260 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:24:07" (1/1) ... [2023-11-23 21:24:07,261 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5ee8b713 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:07, skipping insertion in model container [2023-11-23 21:24:07,261 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:24:07" (1/1) ... [2023-11-23 21:24:07,376 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:24:07,658 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_054653ce-225b-49fb-a9b8-468dcb36d276/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i[4494,4507] [2023-11-23 21:24:07,668 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_054653ce-225b-49fb-a9b8-468dcb36d276/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i[4554,4567] [2023-11-23 21:24:08,755 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,756 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,757 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,758 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,760 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,783 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,784 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,787 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,788 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,791 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,792 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,793 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:08,794 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,479 WARN L635 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-11-23 21:24:09,481 WARN L635 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-11-23 21:24:09,482 WARN L635 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-11-23 21:24:09,485 WARN L635 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-11-23 21:24:09,487 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-11-23 21:24:09,488 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-11-23 21:24:09,488 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-11-23 21:24:09,489 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-11-23 21:24:09,490 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-11-23 21:24:09,491 WARN L635 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-11-23 21:24:09,809 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:24:09,829 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:24:09,845 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_054653ce-225b-49fb-a9b8-468dcb36d276/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i[4494,4507] [2023-11-23 21:24:09,846 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_054653ce-225b-49fb-a9b8-468dcb36d276/sv-benchmarks/c/aws-c-common/aws_linked_list_back_harness_negated.i[4554,4567] [2023-11-23 21:24:09,905 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,909 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,910 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,912 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,917 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,941 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,941 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,946 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,946 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,949 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,950 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,950 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:09,951 WARN L1590 CHandler]: Possible shadowing of function index [2023-11-23 21:24:10,041 WARN L635 FunctionHandler]: implicit declaration of function __atomic_load_n [2023-11-23 21:24:10,043 WARN L635 FunctionHandler]: implicit declaration of function __atomic_store_n [2023-11-23 21:24:10,044 WARN L635 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2023-11-23 21:24:10,045 WARN L635 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2023-11-23 21:24:10,053 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2023-11-23 21:24:10,054 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2023-11-23 21:24:10,055 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2023-11-23 21:24:10,056 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2023-11-23 21:24:10,057 WARN L635 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2023-11-23 21:24:10,058 WARN L635 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2023-11-23 21:24:10,131 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:24:10,432 WARN L675 CHandler]: The function __atomic_fetch_or is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,433 WARN L675 CHandler]: The function __atomic_fetch_sub is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,433 WARN L675 CHandler]: The function __atomic_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,434 WARN L675 CHandler]: The function __atomic_fetch_xor is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,434 WARN L675 CHandler]: The function htons is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,435 WARN L675 CHandler]: The function ntohl is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,435 WARN L675 CHandler]: The function __atomic_compare_exchange_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,436 WARN L675 CHandler]: The function __atomic_fetch_add is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,436 WARN L675 CHandler]: The function htonl is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,436 WARN L675 CHandler]: The function __atomic_store_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,436 WARN L675 CHandler]: The function ntohs is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,437 WARN L675 CHandler]: The function __atomic_load_n is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,437 WARN L675 CHandler]: The function memcmp is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,437 WARN L675 CHandler]: The function __atomic_thread_fence is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,437 WARN L675 CHandler]: The function __atomic_fetch_and is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,438 WARN L675 CHandler]: The function aws_array_list_ensure_capacity is called, but not defined or handled by StandardFunctionHandler. [2023-11-23 21:24:10,445 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:24:10,446 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10 WrapperNode [2023-11-23 21:24:10,447 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:24:10,448 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:24:10,449 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:24:10,449 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:24:10,456 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,561 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,606 INFO L138 Inliner]: procedures = 678, calls = 1045, calls flagged for inlining = 50, calls inlined = 5, statements flattened = 133 [2023-11-23 21:24:10,607 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:24:10,608 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:24:10,608 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:24:10,608 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:24:10,618 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,619 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,623 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,624 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,639 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,644 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,649 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,652 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,659 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:24:10,660 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:24:10,660 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:24:10,660 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:24:10,661 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (1/1) ... [2023-11-23 21:24:10,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:24:10,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:10,707 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:24:10,741 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:24:10,752 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_back [2023-11-23 21:24:10,752 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_back [2023-11-23 21:24:10,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:24:10,756 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-23 21:24:10,757 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-23 21:24:10,757 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2023-11-23 21:24:10,757 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2023-11-23 21:24:10,757 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:24:10,757 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2023-11-23 21:24:10,758 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2023-11-23 21:24:10,758 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:24:10,758 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:24:10,758 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:24:10,758 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:24:10,758 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_empty [2023-11-23 21:24:10,759 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_empty [2023-11-23 21:24:10,759 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-11-23 21:24:10,759 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-11-23 21:24:10,759 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:24:10,759 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:24:10,759 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:24:10,760 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2023-11-23 21:24:10,760 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2023-11-23 21:24:10,760 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_prev_is_valid [2023-11-23 21:24:10,760 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_prev_is_valid [2023-11-23 21:24:10,760 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:24:11,003 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:24:11,005 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:24:11,329 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:24:11,550 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:24:11,551 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-23 21:24:11,553 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:24:11 BoogieIcfgContainer [2023-11-23 21:24:11,553 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:24:11,556 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:24:11,557 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:24:11,561 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:24:11,561 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:24:07" (1/3) ... [2023-11-23 21:24:11,563 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5315d0dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:24:11, skipping insertion in model container [2023-11-23 21:24:11,564 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:24:10" (2/3) ... [2023-11-23 21:24:11,567 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5315d0dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:24:11, skipping insertion in model container [2023-11-23 21:24:11,567 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:24:11" (3/3) ... [2023-11-23 21:24:11,573 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_back_harness_negated.i [2023-11-23 21:24:11,590 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:24:11,590 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:24:11,642 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:24:11,650 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;@71b227d0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:24:11,650 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:24:11,658 INFO L276 IsEmpty]: Start isEmpty. Operand has 69 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2023-11-23 21:24:11,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-23 21:24:11,671 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:11,672 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:11,673 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:11,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:11,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1927739736, now seen corresponding path program 1 times [2023-11-23 21:24:11,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:11,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307374429] [2023-11-23 21:24:11,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:11,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:12,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:12,828 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-11-23 21:24:12,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:12,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307374429] [2023-11-23 21:24:12,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1307374429] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:12,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5564916] [2023-11-23 21:24:12,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:12,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:12,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:12,841 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:12,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:24:13,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:13,098 INFO L262 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 64 conjunts are in the unsatisfiable core [2023-11-23 21:24:13,116 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:13,340 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 21:24:13,355 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 21:24:13,477 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 21:24:13,498 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 29 treesize of output 35 [2023-11-23 21:24:17,264 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-23 21:24:17,264 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:24:17,265 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5564916] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:17,265 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:24:17,265 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5] total 13 [2023-11-23 21:24:17,267 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583689758] [2023-11-23 21:24:17,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:17,274 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:24:17,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:17,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:24:17,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:24:17,312 INFO L87 Difference]: Start difference. First operand has 69 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 24 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:24:18,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:18,414 INFO L93 Difference]: Finished difference Result 188 states and 265 transitions. [2023-11-23 21:24:18,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-23 21:24:18,417 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 52 [2023-11-23 21:24:18,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:18,428 INFO L225 Difference]: With dead ends: 188 [2023-11-23 21:24:18,428 INFO L226 Difference]: Without dead ends: 127 [2023-11-23 21:24:18,434 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 12 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:24:18,441 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 56 mSDsluCounter, 266 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:18,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 355 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-23 21:24:18,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-11-23 21:24:18,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2023-11-23 21:24:18,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 63 states have (on average 1.2063492063492063) internal successors, (76), 65 states have internal predecessors, (76), 46 states have call successors, (46), 15 states have call predecessors, (46), 15 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-11-23 21:24:18,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 166 transitions. [2023-11-23 21:24:18,536 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 166 transitions. Word has length 52 [2023-11-23 21:24:18,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:18,538 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 166 transitions. [2023-11-23 21:24:18,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2023-11-23 21:24:18,539 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 166 transitions. [2023-11-23 21:24:18,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-11-23 21:24:18,544 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:18,544 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:18,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:18,759 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-23 21:24:18,759 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:18,759 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:18,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1815920416, now seen corresponding path program 1 times [2023-11-23 21:24:18,760 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:18,760 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663340318] [2023-11-23 21:24:18,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:18,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:18,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:19,130 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-23 21:24:19,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:19,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663340318] [2023-11-23 21:24:19,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663340318] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:19,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916257668] [2023-11-23 21:24:19,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:19,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:19,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:19,132 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:19,159 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_054653ce-225b-49fb-a9b8-468dcb36d276/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:24:19,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:19,333 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 70 conjunts are in the unsatisfiable core [2023-11-23 21:24:19,340 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:19,357 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:24:19,534 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 21:24:19,550 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 21:24:19,626 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 21:24:19,650 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 21:24:19,650 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 20 [2023-11-23 21:24:19,673 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 21:24:19,674 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-23 21:24:19,686 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 36 [2023-11-23 21:24:19,692 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 21:24:19,802 INFO L349 Elim1Store]: treesize reduction 38, result has 22.4 percent of original size [2023-11-23 21:24:19,802 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 146 treesize of output 142 [2023-11-23 21:24:19,811 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 122 treesize of output 112 [2023-11-23 21:24:19,826 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 36 [2023-11-23 21:24:19,843 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 20 [2023-11-23 21:24:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-23 21:24:22,950 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:24:27,647 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:24:27,647 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 4 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 380 treesize of output 457 [2023-11-23 21:25:04,149 WARN L293 SmtUtils]: Spent 34.41s on a formula simplification. DAG size of input: 151 DAG size of output: 101 (called from [L 346] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2023-11-23 21:25:04,149 INFO L349 Elim1Store]: treesize reduction 175, result has 47.9 percent of original size [2023-11-23 21:25:04,150 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 9 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 10 new quantified variables, introduced 27 case distinctions, treesize of input 546 treesize of output 1280