./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4e7fbc69 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_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 3bef4637cc296c755ba815d09f028f51f0bde7e0d2e6155f2b5c648b5201a193 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-4e7fbc6 [2022-11-23 16:08:29,302 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 16:08:29,304 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 16:08:29,335 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 16:08:29,335 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 16:08:29,339 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 16:08:29,342 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 16:08:29,345 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 16:08:29,348 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 16:08:29,354 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 16:08:29,356 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 16:08:29,358 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 16:08:29,359 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 16:08:29,364 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 16:08:29,366 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 16:08:29,368 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 16:08:29,370 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 16:08:29,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 16:08:29,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 16:08:29,380 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 16:08:29,382 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 16:08:29,384 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 16:08:29,386 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 16:08:29,387 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 16:08:29,397 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 16:08:29,398 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 16:08:29,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 16:08:29,400 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 16:08:29,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 16:08:29,402 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 16:08:29,403 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 16:08:29,404 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 16:08:29,406 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 16:08:29,407 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 16:08:29,410 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 16:08:29,411 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 16:08:29,411 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 16:08:29,412 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 16:08:29,412 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 16:08:29,414 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 16:08:29,415 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 16:08:29,416 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-11-23 16:08:29,477 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 16:08:29,478 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 16:08:29,478 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 16:08:29,478 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 16:08:29,479 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 16:08:29,479 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 16:08:29,480 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 16:08:29,480 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 16:08:29,480 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 16:08:29,481 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 16:08:29,481 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 16:08:29,481 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 16:08:29,481 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 16:08:29,482 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 16:08:29,482 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 16:08:29,482 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 16:08:29,483 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 16:08:29,483 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 16:08:29,484 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 16:08:29,485 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 16:08:29,485 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 16:08:29,486 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-23 16:08:29,486 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 16:08:29,487 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-23 16:08:29,487 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-23 16:08:29,487 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 16:08:29,488 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-23 16:08:29,488 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 16:08:29,488 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 16:08:29,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:08:29,489 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 16:08:29,490 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 16:08:29,490 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 16:08:29,490 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-23 16:08:29,490 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 16:08:29,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 16:08:29,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-23 16:08:29,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 16:08:29,492 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3bef4637cc296c755ba815d09f028f51f0bde7e0d2e6155f2b5c648b5201a193 [2022-11-23 16:08:29,783 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 16:08:29,806 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 16:08:29,809 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 16:08:29,810 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 16:08:29,811 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 16:08:29,812 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i [2022-11-23 16:08:32,907 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 16:08:33,486 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 16:08:33,487 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i [2022-11-23 16:08:33,534 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/data/a2600237c/359550fc78764d189143f5c22304708a/FLAGa55947cf6 [2022-11-23 16:08:33,554 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/data/a2600237c/359550fc78764d189143f5c22304708a [2022-11-23 16:08:33,559 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 16:08:33,561 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 16:08:33,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 16:08:33,567 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 16:08:33,571 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 16:08:33,572 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:08:33" (1/1) ... [2022-11-23 16:08:33,573 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cbc232a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:33, skipping insertion in model container [2022-11-23 16:08:33,573 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 04:08:33" (1/1) ... [2022-11-23 16:08:33,582 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 16:08:33,699 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 16:08:34,065 WARN L237 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_296e39fa-1210-4e35-98a6-285305e60e5a/sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i[4496,4509] [2022-11-23 16:08:34,076 WARN L237 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_296e39fa-1210-4e35-98a6-285305e60e5a/sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i[4556,4569] [2022-11-23 16:08:35,067 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,068 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,069 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,070 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,072 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,095 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,096 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,098 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,098 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,100 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,102 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,103 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,104 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,552 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-11-23 16:08:35,553 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-11-23 16:08:35,554 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-11-23 16:08:35,556 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-11-23 16:08:35,557 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-11-23 16:08:35,558 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-11-23 16:08:35,559 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-11-23 16:08:35,559 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-11-23 16:08:35,560 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-11-23 16:08:35,561 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-11-23 16:08:35,788 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-11-23 16:08:35,820 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:08:35,876 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 16:08:35,889 WARN L237 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_296e39fa-1210-4e35-98a6-285305e60e5a/sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i[4496,4509] [2022-11-23 16:08:35,890 WARN L237 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_296e39fa-1210-4e35-98a6-285305e60e5a/sv-benchmarks/c/aws-c-common/aws_linked_list_rbegin_harness.i[4556,4569] [2022-11-23 16:08:35,962 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,963 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,964 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,964 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,965 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,973 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,973 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,974 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,975 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,976 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,991 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,992 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:35,992 WARN L1569 CHandler]: Possible shadowing of function index [2022-11-23 16:08:36,055 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-11-23 16:08:36,056 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-11-23 16:08:36,065 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-11-23 16:08:36,066 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-11-23 16:08:36,067 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-11-23 16:08:36,068 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-11-23 16:08:36,068 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-11-23 16:08:36,069 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-11-23 16:08:36,069 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-11-23 16:08:36,070 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-11-23 16:08:36,109 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-11-23 16:08:36,132 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 16:08:36,405 INFO L208 MainTranslator]: Completed translation [2022-11-23 16:08:36,406 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36 WrapperNode [2022-11-23 16:08:36,406 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 16:08:36,407 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 16:08:36,407 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 16:08:36,407 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 16:08:36,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,521 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,578 INFO L138 Inliner]: procedures = 679, calls = 1040, calls flagged for inlining = 52, calls inlined = 6, statements flattened = 141 [2022-11-23 16:08:36,579 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 16:08:36,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 16:08:36,580 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 16:08:36,581 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 16:08:36,590 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,609 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,610 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,622 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,631 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,635 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 16:08:36,660 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 16:08:36,662 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 16:08:36,662 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 16:08:36,663 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (1/1) ... [2022-11-23 16:08:36,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 16:08:36,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:36,700 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 16:08:36,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 16:08:36,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 16:08:36,747 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 16:08:36,748 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 16:08:36,748 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_next_is_valid [2022-11-23 16:08:36,748 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_next_is_valid [2022-11-23 16:08:36,748 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 16:08:36,748 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_is_valid [2022-11-23 16:08:36,748 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_is_valid [2022-11-23 16:08:36,749 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 16:08:36,749 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-23 16:08:36,749 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 16:08:36,750 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 16:08:36,750 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-23 16:08:36,750 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-23 16:08:36,750 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 16:08:36,750 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-23 16:08:36,750 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-23 16:08:36,751 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2022-11-23 16:08:36,751 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2022-11-23 16:08:36,751 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 16:08:37,073 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 16:08:37,077 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 16:08:37,384 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 16:08:37,569 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 16:08:37,569 INFO L300 CfgBuilder]: Removed 2 assume(true) statements. [2022-11-23 16:08:37,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:08:37 BoogieIcfgContainer [2022-11-23 16:08:37,572 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 16:08:37,576 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 16:08:37,576 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 16:08:37,580 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 16:08:37,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 04:08:33" (1/3) ... [2022-11-23 16:08:37,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530aa1d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:08:37, skipping insertion in model container [2022-11-23 16:08:37,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 04:08:36" (2/3) ... [2022-11-23 16:08:37,585 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530aa1d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 04:08:37, skipping insertion in model container [2022-11-23 16:08:37,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 04:08:37" (3/3) ... [2022-11-23 16:08:37,588 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_rbegin_harness.i [2022-11-23 16:08:37,609 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 16:08:37,609 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-23 16:08:37,668 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 16:08:37,674 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=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1a7baa4b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 16:08:37,675 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-23 16:08:37,678 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) [2022-11-23 16:08:37,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-23 16:08:37,688 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:37,689 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] [2022-11-23 16:08:37,689 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:08:37,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:37,695 INFO L85 PathProgramCache]: Analyzing trace with hash 2063254078, now seen corresponding path program 1 times [2022-11-23 16:08:37,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:37,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763723626] [2022-11-23 16:08:37,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:37,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:38,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:38,553 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:08:38,555 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:38,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763723626] [2022-11-23 16:08:38,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1763723626] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:38,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797317045] [2022-11-23 16:08:38,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:38,572 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:38,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:38,581 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:38,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 16:08:38,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:38,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-23 16:08:38,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:39,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 19 [2022-11-23 16:08:39,094 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 19 [2022-11-23 16:08:39,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,206 INFO L350 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 43 [2022-11-23 16:08:39,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:39,227 INFO L350 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 35 treesize of output 41 [2022-11-23 16:08:40,800 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:08:40,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:08:40,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797317045] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:08:40,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:08:40,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5] total 11 [2022-11-23 16:08:40,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547106092] [2022-11-23 16:08:40,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:08:40,810 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:08:40,810 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:08:40,845 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:08:40,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-11-23 16:08:40,849 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 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-23 16:08:41,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:08:41,589 INFO L93 Difference]: Finished difference Result 124 states and 173 transitions. [2022-11-23 16:08:41,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 16:08:41,592 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) Word has length 37 [2022-11-23 16:08:41,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:08:41,602 INFO L225 Difference]: With dead ends: 124 [2022-11-23 16:08:41,602 INFO L226 Difference]: Without dead ends: 83 [2022-11-23 16:08:41,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2022-11-23 16:08:41,608 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 65 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:08:41,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 162 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 16:08:41,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-11-23 16:08:41,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81. [2022-11-23 16:08:41,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 46 states have (on average 1.3043478260869565) internal successors, (60), 49 states have internal predecessors, (60), 24 states have call successors, (24), 9 states have call predecessors, (24), 10 states have return successors, (24), 22 states have call predecessors, (24), 22 states have call successors, (24) [2022-11-23 16:08:41,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 108 transitions. [2022-11-23 16:08:41,670 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 108 transitions. Word has length 37 [2022-11-23 16:08:41,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:08:41,671 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 108 transitions. [2022-11-23 16:08:41,671 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (7), 2 states have call predecessors, (7), 3 states have call successors, (7) [2022-11-23 16:08:41,671 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 108 transitions. [2022-11-23 16:08:41,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-11-23 16:08:41,674 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:08:41,674 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] [2022-11-23 16:08:41,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 16:08:41,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-11-23 16:08:41,881 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:08:41,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:08:41,883 INFO L85 PathProgramCache]: Analyzing trace with hash 1943617686, now seen corresponding path program 1 times [2022-11-23 16:08:41,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:08:41,884 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702000335] [2022-11-23 16:08:41,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:41,885 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:08:41,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:42,263 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 16:08:42,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:08:42,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702000335] [2022-11-23 16:08:42,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702000335] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:08:42,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [338481550] [2022-11-23 16:08:42,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:08:42,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:08:42,265 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:08:42,266 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:08:42,294 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 16:08:42,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:08:42,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-23 16:08:42,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:08:42,614 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 19 [2022-11-23 16:08:42,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 19 [2022-11-23 16:08:42,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,718 INFO L350 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 33 treesize of output 38 [2022-11-23 16:08:42,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,725 INFO L350 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 32 treesize of output 30 [2022-11-23 16:08:42,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,745 INFO L350 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 33 treesize of output 38 [2022-11-23 16:08:42,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,754 INFO L350 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 32 treesize of output 30 [2022-11-23 16:08:42,881 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-23 16:08:42,882 INFO L350 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 127 treesize of output 141 [2022-11-23 16:08:42,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,904 INFO L350 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 137 treesize of output 125 [2022-11-23 16:08:42,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,925 INFO L350 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 46 treesize of output 39 [2022-11-23 16:08:42,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,937 INFO L350 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 30 treesize of output 44 [2022-11-23 16:08:42,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2022-11-23 16:08:42,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:42,980 INFO L350 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 68 treesize of output 21 [2022-11-23 16:08:42,986 INFO L350 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 11 treesize of output 7 [2022-11-23 16:08:45,413 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-23 16:08:45,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:08:51,129 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| 0))) (.cse2 (+ 16 |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|)) (.cse1 (+ |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset| 24)) (.cse4 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base|)) (.cse7 (+ 8 |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|))) (and (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (or (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (forall ((v_ArrVal_224 Int) (v_ArrVal_226 (Array Int Int)) (v_ArrVal_222 (Array Int Int))) (= (select (select (store (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_226) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_222) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_224)) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse2) 0)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0))) (or (not (= |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base| 0)) (not (= |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (or (forall ((v_ArrVal_227 (Array Int Int)) (v_ArrVal_225 (Array Int Int))) (not (= (select (select (let ((.cse3 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|)))) (store (store .cse3 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_225) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse3 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_227) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|))) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|) 0))) (forall ((v_ArrVal_224 Int) (v_ArrVal_226 (Array Int Int)) (v_ArrVal_222 (Array Int Int))) (not (= (select (select (store (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_226) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_222) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_224)) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|) 0))) (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (let ((.cse6 (+ |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset| 24))) (or (forall ((v_ArrVal_227 (Array Int Int)) (v_ArrVal_225 (Array Int Int))) (not (= 0 (select (select (let ((.cse5 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|)))) (store (store .cse5 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_225) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse5 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_227) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|))) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse6)))) (forall ((v_ArrVal_224 Int) (v_ArrVal_226 (Array Int Int)) (v_ArrVal_222 (Array Int Int))) (not (= (select (select (store (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_226) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_222) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_224)) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse6) 0))) (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0)))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (or (forall ((v_ArrVal_224 Int) (v_ArrVal_226 (Array Int Int)) (v_ArrVal_222 (Array Int Int))) (= (select (select (store (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_226) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_222) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 v_ArrVal_224)) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse7) 0)) (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (or (forall ((v_ArrVal_227 (Array Int Int)) (v_ArrVal_225 (Array Int Int))) (= 0 (select (select (let ((.cse8 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|)))) (store (store .cse8 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_225) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse8 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_227) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|))) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse2))) (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0))) (forall ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| Int)) (or (not (< |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| |c_#StackHeapBarrier|)) (forall ((v_ArrVal_227 (Array Int Int)) (v_ArrVal_225 (Array Int Int))) (= (select (select (let ((.cse9 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| (store .cse4 |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|)))) (store (store .cse9 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_225) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store .cse9 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| v_ArrVal_227) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) .cse1 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17|))) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) .cse7) 0)) (= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_17| 0))))) is different from false [2022-11-23 16:08:51,216 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:08:51,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 54 [2022-11-23 16:08:51,238 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:08:51,238 INFO L350 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 146 treesize of output 142 [2022-11-23 16:08:51,248 INFO L350 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 136 treesize of output 128 [2022-11-23 16:08:51,258 INFO L350 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 63 treesize of output 59 [2022-11-23 16:08:51,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 16:08:51,430 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:08:51,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 59 treesize of output 73 [2022-11-23 16:08:51,505 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:08:51,506 INFO L350 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 61 treesize of output 54 [2022-11-23 16:08:51,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:51,514 INFO L350 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 87 treesize of output 69 [2022-11-23 16:08:51,518 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,521 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,541 INFO L321 Elim1Store]: treesize reduction 5, result has 73.7 percent of original size [2022-11-23 16:08:51,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 62 treesize of output 53 [2022-11-23 16:08:51,549 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,552 INFO L350 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 11 treesize of output 7 [2022-11-23 16:08:51,564 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,565 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,570 INFO L321 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2022-11-23 16:08:51,570 INFO L350 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 61 treesize of output 1 [2022-11-23 16:08:51,578 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-23 16:08:51,590 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,591 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:51,595 INFO L321 Elim1Store]: treesize reduction 28, result has 3.4 percent of original size [2022-11-23 16:08:51,596 INFO L350 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 61 treesize of output 1 [2022-11-23 16:08:51,604 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-23 16:08:51,697 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 1 not checked. [2022-11-23 16:08:51,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [338481550] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:08:51,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [513191150] [2022-11-23 16:08:51,726 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2022-11-23 16:08:51,732 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:08:51,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:08:51,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:08:51,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:08:51,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:51,865 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:08:51,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:08:51,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:51,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:08:52,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:08:52,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:08:52,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:08:52,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,327 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:08:52,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,467 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-23 16:08:52,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 8 case distinctions, treesize of input 42 treesize of output 73 [2022-11-23 16:08:52,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:08:52,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 17 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 46 [2022-11-23 16:08:52,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 7 [2022-11-23 16:08:52,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 20 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:08:52,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:52,702 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:52,705 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 20 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:08:53,026 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:53,029 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:53,030 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:53,031 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:53,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:53,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:53,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:53,041 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:53,044 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:53,445 INFO L321 Elim1Store]: treesize reduction 227, result has 25.3 percent of original size [2022-11-23 16:08:53,445 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 12 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 666 treesize of output 675 [2022-11-23 16:08:54,020 INFO L321 Elim1Store]: treesize reduction 192, result has 23.5 percent of original size [2022-11-23 16:08:54,020 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 23 case distinctions, treesize of input 650 treesize of output 684 [2022-11-23 16:08:54,244 INFO L321 Elim1Store]: treesize reduction 96, result has 13.5 percent of original size [2022-11-23 16:08:54,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 11 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 643 treesize of output 654 [2022-11-23 16:08:54,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:54,326 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,328 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,329 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:54,332 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:54,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:54,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:54,347 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,351 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,580 INFO L321 Elim1Store]: treesize reduction 233, result has 25.6 percent of original size [2022-11-23 16:08:54,580 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 19 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 27 case distinctions, treesize of input 688 treesize of output 691 [2022-11-23 16:08:54,647 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:54,674 INFO L321 Elim1Store]: treesize reduction 45, result has 13.5 percent of original size [2022-11-23 16:08:54,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 682 treesize of output 635 [2022-11-23 16:08:54,711 INFO L350 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 656 treesize of output 635 [2022-11-23 16:08:56,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:56,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:08:56,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 16:08:56,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 16:08:56,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:56,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 16:08:57,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 13 [2022-11-23 16:08:57,041 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:08:57,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 23 [2022-11-23 16:08:57,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:08:57,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 16:08:57,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,116 INFO L350 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 35 treesize of output 7 [2022-11-23 16:08:57,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,135 INFO L350 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 29 treesize of output 17 [2022-11-23 16:08:57,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:08:57,154 INFO L350 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 35 treesize of output 7 [2022-11-23 16:08:57,689 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 43 for LOIs [2022-11-23 16:08:57,897 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 136 for LOIs [2022-11-23 16:08:57,948 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:08:57,969 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:09:01,161 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [513191150] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:09:01,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:09:01,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [5, 10, 9] total 32 [2022-11-23 16:09:01,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007077015] [2022-11-23 16:09:01,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:09:01,163 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 16:09:01,163 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:01,164 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 16:09:01,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=832, Unknown=2, NotChecked=58, Total=992 [2022-11-23 16:09:01,167 INFO L87 Difference]: Start difference. First operand 81 states and 108 transitions. Second operand has 13 states, 10 states have (on average 1.5) internal successors, (15), 8 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) [2022-11-23 16:09:03,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:09:03,250 INFO L93 Difference]: Finished difference Result 145 states and 191 transitions. [2022-11-23 16:09:03,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 16:09:03,251 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 1.5) internal successors, (15), 8 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 [2022-11-23 16:09:03,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:09:03,253 INFO L225 Difference]: With dead ends: 145 [2022-11-23 16:09:03,253 INFO L226 Difference]: Without dead ends: 107 [2022-11-23 16:09:03,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 77 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=121, Invalid=1003, Unknown=2, NotChecked=64, Total=1190 [2022-11-23 16:09:03,255 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 27 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:09:03,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 180 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 16:09:03,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-11-23 16:09:03,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 105. [2022-11-23 16:09:03,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 65 states have (on average 1.353846153846154) internal successors, (88), 68 states have internal predecessors, (88), 26 states have call successors, (26), 12 states have call predecessors, (26), 13 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2022-11-23 16:09:03,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 139 transitions. [2022-11-23 16:09:03,293 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 139 transitions. Word has length 38 [2022-11-23 16:09:03,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:09:03,293 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 139 transitions. [2022-11-23 16:09:03,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 1.5) internal successors, (15), 8 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) [2022-11-23 16:09:03,293 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 139 transitions. [2022-11-23 16:09:03,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-23 16:09:03,295 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:09:03,295 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] [2022-11-23 16:09:03,302 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 16:09:03,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2022-11-23 16:09:03,502 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:09:03,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:09:03,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1859140634, now seen corresponding path program 1 times [2022-11-23 16:09:03,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:09:03,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204406846] [2022-11-23 16:09:03,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:03,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:09:03,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:03,668 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:09:03,668 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:09:03,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204406846] [2022-11-23 16:09:03,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204406846] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:09:03,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38948839] [2022-11-23 16:09:03,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:03,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:03,670 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:09:03,671 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:09:03,698 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 16:09:03,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:03,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-23 16:09:03,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:09:03,925 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:09:03,926 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:09:03,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38948839] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:09:03,926 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:09:03,926 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2022-11-23 16:09:03,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149133576] [2022-11-23 16:09:03,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:09:03,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 16:09:03,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:03,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 16:09:03,928 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-23 16:09:03,928 INFO L87 Difference]: Start difference. First operand 105 states and 139 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 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) [2022-11-23 16:09:04,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:09:04,106 INFO L93 Difference]: Finished difference Result 213 states and 283 transitions. [2022-11-23 16:09:04,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 16:09:04,107 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 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 39 [2022-11-23 16:09:04,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:09:04,109 INFO L225 Difference]: With dead ends: 213 [2022-11-23 16:09:04,109 INFO L226 Difference]: Without dead ends: 115 [2022-11-23 16:09:04,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-11-23 16:09:04,111 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 33 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:09:04,112 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 152 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:09:04,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-11-23 16:09:04,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 105. [2022-11-23 16:09:04,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 65 states have (on average 1.323076923076923) internal successors, (86), 68 states have internal predecessors, (86), 26 states have call successors, (26), 12 states have call predecessors, (26), 13 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2022-11-23 16:09:04,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 137 transitions. [2022-11-23 16:09:04,154 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 137 transitions. Word has length 39 [2022-11-23 16:09:04,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:09:04,154 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 137 transitions. [2022-11-23 16:09:04,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 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) [2022-11-23 16:09:04,155 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 137 transitions. [2022-11-23 16:09:04,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-11-23 16:09:04,156 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:09:04,157 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] [2022-11-23 16:09:04,164 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 16:09:04,363 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:04,364 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:09:04,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:09:04,364 INFO L85 PathProgramCache]: Analyzing trace with hash -2129804384, now seen corresponding path program 1 times [2022-11-23 16:09:04,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:09:04,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664424814] [2022-11-23 16:09:04,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:04,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:09:04,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:04,579 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:09:04,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:09:04,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664424814] [2022-11-23 16:09:04,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664424814] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:09:04,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000300421] [2022-11-23 16:09:04,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:04,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:04,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:09:04,581 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:09:04,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 16:09:04,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:04,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-23 16:09:04,780 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:09:04,855 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:09:04,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:09:04,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000300421] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:09:04,856 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:09:04,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2022-11-23 16:09:04,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755359609] [2022-11-23 16:09:04,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:09:04,857 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 16:09:04,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:04,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 16:09:04,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2022-11-23 16:09:04,858 INFO L87 Difference]: Start difference. First operand 105 states and 137 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 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) [2022-11-23 16:09:05,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:09:05,117 INFO L93 Difference]: Finished difference Result 255 states and 343 transitions. [2022-11-23 16:09:05,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 16:09:05,118 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 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 41 [2022-11-23 16:09:05,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:09:05,120 INFO L225 Difference]: With dead ends: 255 [2022-11-23 16:09:05,120 INFO L226 Difference]: Without dead ends: 155 [2022-11-23 16:09:05,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2022-11-23 16:09:05,122 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 63 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:09:05,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 177 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 16:09:05,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-23 16:09:05,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 107. [2022-11-23 16:09:05,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 67 states have (on average 1.3134328358208955) internal successors, (88), 70 states have internal predecessors, (88), 26 states have call successors, (26), 12 states have call predecessors, (26), 13 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2022-11-23 16:09:05,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 139 transitions. [2022-11-23 16:09:05,175 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 139 transitions. Word has length 41 [2022-11-23 16:09:05,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:09:05,176 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 139 transitions. [2022-11-23 16:09:05,176 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 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) [2022-11-23 16:09:05,176 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 139 transitions. [2022-11-23 16:09:05,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-23 16:09:05,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:09:05,178 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] [2022-11-23 16:09:05,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 16:09:05,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:05,386 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:09:05,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:09:05,386 INFO L85 PathProgramCache]: Analyzing trace with hash -647115340, now seen corresponding path program 1 times [2022-11-23 16:09:05,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:09:05,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845662448] [2022-11-23 16:09:05,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:05,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:09:05,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:05,631 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:09:05,631 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:09:05,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845662448] [2022-11-23 16:09:05,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845662448] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:09:05,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473635680] [2022-11-23 16:09:05,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:05,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:05,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:09:05,633 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:09:05,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 16:09:05,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:05,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 2 conjunts are in the unsatisfiable core [2022-11-23 16:09:05,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:09:05,856 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 16:09:05,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:09:05,857 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473635680] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:09:05,857 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:09:05,857 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2022-11-23 16:09:05,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218464173] [2022-11-23 16:09:05,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:09:05,858 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 16:09:05,858 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:05,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 16:09:05,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-23 16:09:05,859 INFO L87 Difference]: Start difference. First operand 107 states and 139 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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) [2022-11-23 16:09:05,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:09:05,941 INFO L93 Difference]: Finished difference Result 229 states and 315 transitions. [2022-11-23 16:09:05,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 16:09:05,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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 42 [2022-11-23 16:09:05,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:09:05,943 INFO L225 Difference]: With dead ends: 229 [2022-11-23 16:09:05,944 INFO L226 Difference]: Without dead ends: 135 [2022-11-23 16:09:05,945 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-23 16:09:05,945 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 6 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:09:05,946 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 94 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 16:09:05,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-23 16:09:05,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 113. [2022-11-23 16:09:05,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 73 states have (on average 1.3150684931506849) internal successors, (96), 76 states have internal predecessors, (96), 26 states have call successors, (26), 12 states have call predecessors, (26), 13 states have return successors, (25), 24 states have call predecessors, (25), 24 states have call successors, (25) [2022-11-23 16:09:05,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 147 transitions. [2022-11-23 16:09:05,984 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 147 transitions. Word has length 42 [2022-11-23 16:09:05,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:09:05,984 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 147 transitions. [2022-11-23 16:09:05,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 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) [2022-11-23 16:09:05,984 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 147 transitions. [2022-11-23 16:09:05,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-11-23 16:09:05,991 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:09:05,992 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] [2022-11-23 16:09:06,008 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 16:09:06,198 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:06,198 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:09:06,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:09:06,199 INFO L85 PathProgramCache]: Analyzing trace with hash 625474841, now seen corresponding path program 1 times [2022-11-23 16:09:06,199 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:09:06,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406746737] [2022-11-23 16:09:06,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:06,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:09:06,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:06,435 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:09:06,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:09:06,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406746737] [2022-11-23 16:09:06,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406746737] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:09:06,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1794948896] [2022-11-23 16:09:06,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:06,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:06,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:09:06,437 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:09:06,446 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 16:09:06,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:06,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-23 16:09:06,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:09:06,765 INFO L321 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-23 16:09:06,766 INFO L350 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-23 16:09:06,787 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 16:09:06,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-23 16:09:06,797 INFO L350 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 10 treesize of output 9 [2022-11-23 16:09:06,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2022-11-23 16:09:06,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 48 treesize of output 28 [2022-11-23 16:09:06,867 INFO L350 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 21 treesize of output 13 [2022-11-23 16:09:16,532 WARN L233 SmtUtils]: Spent 8.00s on a formula simplification that was a NOOP. DAG size: 75 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:09:19,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,622 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:19,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,627 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:19,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,630 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:19,640 INFO L321 Elim1Store]: treesize reduction 80, result has 1.2 percent of original size [2022-11-23 16:09:19,641 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 15 select indices, 15 select index equivalence classes, 6 disjoint index pairs (out of 105 index pairs), introduced 11 new quantified variables, introduced 77 case distinctions, treesize of input 209 treesize of output 143 [2022-11-23 16:09:19,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,652 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:19,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:19,658 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:19,667 INFO L321 Elim1Store]: treesize reduction 56, result has 1.8 percent of original size [2022-11-23 16:09:19,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 6 disjoint index pairs (out of 66 index pairs), introduced 9 new quantified variables, introduced 45 case distinctions, treesize of input 140 treesize of output 86 [2022-11-23 16:09:19,675 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:09:19,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:09:24,206 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 16:09:24,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1794948896] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:09:24,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1407578049] [2022-11-23 16:09:24,210 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-23 16:09:24,210 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:09:24,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:09:24,211 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:09:24,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:09:24,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,304 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:09:24,305 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:09:24,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:09:24,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:09:24,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:09:24,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,660 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:09:24,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,687 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:09:24,759 INFO L350 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 35 treesize of output 7 [2022-11-23 16:09:24,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:09:24,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,823 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:09:24,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:24,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:09:25,705 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 132 for LOIs [2022-11-23 16:09:26,294 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 170 for LOIs [2022-11-23 16:09:26,368 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:09:26,387 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 23 for LOIs [2022-11-23 16:09:26,483 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:09:33,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1407578049] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:09:33,974 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:09:33,975 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [6, 14, 8] total 42 [2022-11-23 16:09:33,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903387465] [2022-11-23 16:09:33,975 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:09:33,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 16:09:33,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:09:33,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 16:09:33,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1523, Unknown=0, NotChecked=0, Total=1722 [2022-11-23 16:09:33,978 INFO L87 Difference]: Start difference. First operand 113 states and 147 transitions. Second operand has 20 states, 16 states have (on average 1.3125) internal successors, (21), 13 states have internal predecessors, (21), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:09:39,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:09:39,086 INFO L93 Difference]: Finished difference Result 175 states and 224 transitions. [2022-11-23 16:09:39,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-23 16:09:39,088 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 1.3125) internal successors, (21), 13 states have internal predecessors, (21), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 45 [2022-11-23 16:09:39,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:09:39,090 INFO L225 Difference]: With dead ends: 175 [2022-11-23 16:09:39,090 INFO L226 Difference]: Without dead ends: 123 [2022-11-23 16:09:39,091 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 93 SyntacticMatches, 6 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 19.9s TimeCoverageRelationStatistics Valid=256, Invalid=1906, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 16:09:39,092 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 55 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 572 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 453 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-11-23 16:09:39,093 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 453 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 572 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-11-23 16:09:39,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-11-23 16:09:39,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2022-11-23 16:09:39,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 77 states have (on average 1.3116883116883118) internal successors, (101), 81 states have internal predecessors, (101), 27 states have call successors, (27), 13 states have call predecessors, (27), 15 states have return successors, (27), 25 states have call predecessors, (27), 25 states have call successors, (27) [2022-11-23 16:09:39,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 155 transitions. [2022-11-23 16:09:39,155 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 155 transitions. Word has length 45 [2022-11-23 16:09:39,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:09:39,156 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 155 transitions. [2022-11-23 16:09:39,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 1.3125) internal successors, (21), 13 states have internal predecessors, (21), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:09:39,157 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 155 transitions. [2022-11-23 16:09:39,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-11-23 16:09:39,158 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:09:39,158 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] [2022-11-23 16:09:39,172 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 16:09:39,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:39,367 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:09:39,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:09:39,367 INFO L85 PathProgramCache]: Analyzing trace with hash 105816945, now seen corresponding path program 1 times [2022-11-23 16:09:39,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:09:39,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148464363] [2022-11-23 16:09:39,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:39,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:09:39,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:39,692 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 16:09:39,692 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:09:39,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148464363] [2022-11-23 16:09:39,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148464363] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:09:39,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507624064] [2022-11-23 16:09:39,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:09:39,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:09:39,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:09:39,694 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:09:39,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 16:09:39,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:09:39,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-23 16:09:39,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:09:40,103 INFO L350 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 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2022-11-23 16:09:40,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:40,109 INFO L350 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 14 treesize of output 16 [2022-11-23 16:09:40,188 INFO L321 Elim1Store]: treesize reduction 42, result has 20.8 percent of original size [2022-11-23 16:09:40,189 INFO L350 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 95 treesize of output 115 [2022-11-23 16:09:40,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:40,202 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 111 treesize of output 91 [2022-11-23 16:09:40,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:40,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-23 16:09:40,224 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2022-11-23 16:09:40,337 WARN L859 $PredicateComparison]: unable to prove that (exists ((v_DerPreprocessor_16 (Array Int Int)) (v_DerPreprocessor_17 (Array Int Int)) (|v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50| Int)) (let ((.cse0 (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50|))) (let ((.cse1 (select .cse0 0))) (and (= (select .cse0 24) .cse1) (= (select (store (store (store (store |c_#memory_$Pointer$.base| .cse1 v_DerPreprocessor_16) |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50| v_DerPreprocessor_17) .cse1 v_DerPreprocessor_16) |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50| v_DerPreprocessor_17) .cse1) (select |c_#memory_$Pointer$.base| .cse1)) (<= (+ .cse1 2) |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50|) (<= 2 |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_50|) (not (= .cse1 0)) (= .cse1 (select v_DerPreprocessor_17 24)))))) is different from true [2022-11-23 16:09:44,570 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2022-11-23 16:09:44,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:09:49,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 590 treesize of output 546 [2022-11-23 16:09:49,318 INFO L350 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 546 treesize of output 490 [2022-11-23 16:09:49,333 INFO L350 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 490 treesize of output 462 [2022-11-23 16:09:49,637 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,638 INFO L350 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 219 treesize of output 148 [2022-11-23 16:09:49,667 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 1393 treesize of output 1181 [2022-11-23 16:09:49,708 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 1301 treesize of output 1261 [2022-11-23 16:09:49,736 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,737 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 1261 treesize of output 1241 [2022-11-23 16:09:49,768 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1293 treesize of output 1277 [2022-11-23 16:09:49,800 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:49,801 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1277 treesize of output 1269 [2022-11-23 16:09:50,120 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 93 treesize of output 85 [2022-11-23 16:09:50,139 INFO L350 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 213 treesize of output 203 [2022-11-23 16:09:50,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 57 treesize of output 49 [2022-11-23 16:09:50,376 INFO L350 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 119 treesize of output 109 [2022-11-23 16:09:50,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-23 16:09:50,423 INFO L350 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 44 treesize of output 34 [2022-11-23 16:09:50,572 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:09:50,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 314 treesize of output 280 [2022-11-23 16:09:52,064 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 16:09:52,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507624064] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:09:52,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592969980] [2022-11-23 16:09:52,068 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-23 16:09:52,068 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:09:52,069 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:09:52,069 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:09:52,069 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:09:52,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,160 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:09:52,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:09:52,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:09:52,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,437 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,438 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:09:52,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:09:52,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,506 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:09:52,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:09:52,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,601 INFO L350 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 50 treesize of output 28 [2022-11-23 16:09:52,616 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,688 INFO L321 Elim1Store]: treesize reduction 40, result has 48.1 percent of original size [2022-11-23 16:09:52,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 62 [2022-11-23 16:09:52,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,740 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:52,761 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 16:09:52,761 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 103 [2022-11-23 16:09:52,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,877 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-23 16:09:52,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 8 case distinctions, treesize of input 42 treesize of output 73 [2022-11-23 16:09:52,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 7 [2022-11-23 16:09:52,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:52,954 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:52,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 20 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:09:53,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 16:09:53,061 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 16:09:53,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 16:09:53,108 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:09:53,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 23 [2022-11-23 16:09:53,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:09:53,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,168 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:09:53,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,213 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 16:09:53,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,238 INFO L350 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 35 treesize of output 7 [2022-11-23 16:09:53,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,261 INFO L350 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 29 treesize of output 17 [2022-11-23 16:09:53,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:09:53,286 INFO L350 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 35 treesize of output 7 [2022-11-23 16:09:54,486 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 43 for LOIs [2022-11-23 16:09:55,001 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 156 for LOIs [2022-11-23 16:09:55,051 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:09:55,073 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 25 for LOIs [2022-11-23 16:09:55,144 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:10:02,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [592969980] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:10:02,375 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:10:02,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [6, 19, 12] total 52 [2022-11-23 16:10:02,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008355231] [2022-11-23 16:10:02,376 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:10:02,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 16:10:02,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:10:02,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 16:10:02,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2289, Unknown=82, NotChecked=98, Total=2652 [2022-11-23 16:10:02,378 INFO L87 Difference]: Start difference. First operand 120 states and 155 transitions. Second operand has 20 states, 16 states have (on average 1.375) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:06,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:10:06,424 INFO L93 Difference]: Finished difference Result 181 states and 232 transitions. [2022-11-23 16:10:06,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 16:10:06,424 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 1.375) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 46 [2022-11-23 16:10:06,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:10:06,426 INFO L225 Difference]: With dead ends: 181 [2022-11-23 16:10:06,426 INFO L226 Difference]: Without dead ends: 127 [2022-11-23 16:10:06,427 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 89 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 13.1s TimeCoverageRelationStatistics Valid=236, Invalid=2871, Unknown=89, NotChecked=110, Total=3306 [2022-11-23 16:10:06,428 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 63 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 473 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 473 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-23 16:10:06,429 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [77 Valid, 149 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 473 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-23 16:10:06,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-23 16:10:06,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 125. [2022-11-23 16:10:06,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 80 states have (on average 1.3125) internal successors, (105), 84 states have internal predecessors, (105), 28 states have call successors, (28), 14 states have call predecessors, (28), 16 states have return successors, (28), 26 states have call predecessors, (28), 26 states have call successors, (28) [2022-11-23 16:10:06,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 161 transitions. [2022-11-23 16:10:06,508 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 161 transitions. Word has length 46 [2022-11-23 16:10:06,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:10:06,509 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 161 transitions. [2022-11-23 16:10:06,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 1.375) internal successors, (22), 13 states have internal predecessors, (22), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:06,509 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 161 transitions. [2022-11-23 16:10:06,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-23 16:10:06,510 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:10:06,510 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, 1] [2022-11-23 16:10:06,517 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 16:10:06,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:10:06,715 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:10:06,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:10:06,716 INFO L85 PathProgramCache]: Analyzing trace with hash 2023309535, now seen corresponding path program 1 times [2022-11-23 16:10:06,716 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:10:06,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040551407] [2022-11-23 16:10:06,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:06,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:10:06,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:07,681 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:10:07,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:10:07,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040551407] [2022-11-23 16:10:07,682 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040551407] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:10:07,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300503465] [2022-11-23 16:10:07,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:07,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:10:07,682 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:10:07,691 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:10:07,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 16:10:07,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:07,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-23 16:10:07,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:10:10,940 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-23 16:10:10,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:10:11,196 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:10:11,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [300503465] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:10:11,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [748223959] [2022-11-23 16:10:11,200 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:10:11,200 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:10:11,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:10:11,201 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:10:11,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:10:11,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,272 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-23 16:10:11,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 50 [2022-11-23 16:10:11,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,347 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:10:11,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:10:11,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:10:11,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:10:11,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,632 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:10:11,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,660 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:10:11,709 INFO L350 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 35 treesize of output 7 [2022-11-23 16:10:11,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,741 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:10:11,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:10:11,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:11,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:10:12,567 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 126 for LOIs [2022-11-23 16:10:13,580 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 170 for LOIs [2022-11-23 16:10:13,647 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:10:13,665 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:10:13,728 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:10:22,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [748223959] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:10:22,702 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:10:22,702 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [8, 8, 6] total 37 [2022-11-23 16:10:22,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920210541] [2022-11-23 16:10:22,702 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:10:22,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-23 16:10:22,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:10:22,703 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-23 16:10:22,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1166, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 16:10:22,704 INFO L87 Difference]: Start difference. First operand 125 states and 161 transitions. Second operand has 21 states, 16 states have (on average 1.4375) internal successors, (23), 14 states have internal predecessors, (23), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:29,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:10:29,554 INFO L93 Difference]: Finished difference Result 194 states and 246 transitions. [2022-11-23 16:10:29,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-23 16:10:29,555 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 1.4375) internal successors, (23), 14 states have internal predecessors, (23), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 47 [2022-11-23 16:10:29,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:10:29,557 INFO L225 Difference]: With dead ends: 194 [2022-11-23 16:10:29,557 INFO L226 Difference]: Without dead ends: 135 [2022-11-23 16:10:29,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 109 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 639 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=273, Invalid=1619, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 16:10:29,559 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 116 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-23 16:10:29,560 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 299 Invalid, 814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-23 16:10:29,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-23 16:10:29,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 126. [2022-11-23 16:10:29,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 81 states have (on average 1.308641975308642) internal successors, (106), 85 states have internal predecessors, (106), 28 states have call successors, (28), 14 states have call predecessors, (28), 16 states have return successors, (28), 26 states have call predecessors, (28), 26 states have call successors, (28) [2022-11-23 16:10:29,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 162 transitions. [2022-11-23 16:10:29,635 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 162 transitions. Word has length 47 [2022-11-23 16:10:29,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:10:29,636 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 162 transitions. [2022-11-23 16:10:29,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 1.4375) internal successors, (23), 14 states have internal predecessors, (23), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:29,636 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 162 transitions. [2022-11-23 16:10:29,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 16:10:29,637 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:10:29,637 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, 1, 1] [2022-11-23 16:10:29,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 16:10:29,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-23 16:10:29,845 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:10:29,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:10:29,846 INFO L85 PathProgramCache]: Analyzing trace with hash 848277815, now seen corresponding path program 1 times [2022-11-23 16:10:29,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:10:29,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1181106582] [2022-11-23 16:10:29,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:29,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:10:29,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:30,767 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 16:10:30,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:10:30,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1181106582] [2022-11-23 16:10:30,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1181106582] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:10:30,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406763505] [2022-11-23 16:10:30,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:30,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:10:30,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:10:30,770 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:10:30,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 16:10:31,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:31,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 45 conjunts are in the unsatisfiable core [2022-11-23 16:10:31,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:10:34,006 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 16:10:34,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:10:34,375 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 16:10:34,375 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406763505] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:10:34,375 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802844533] [2022-11-23 16:10:34,379 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:10:34,379 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:10:34,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:10:34,382 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:10:34,382 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:10:34,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,453 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-23 16:10:34,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 50 [2022-11-23 16:10:34,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,519 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:10:34,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:10:34,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:10:34,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:10:34,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:10:34,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,849 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:10:34,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,906 INFO L350 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 50 treesize of output 28 [2022-11-23 16:10:34,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,925 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:34,950 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:10:34,969 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 16:10:34,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 103 [2022-11-23 16:10:35,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,003 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 7 [2022-11-23 16:10:35,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,083 INFO L321 Elim1Store]: treesize reduction 40, result has 48.1 percent of original size [2022-11-23 16:10:35,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 62 [2022-11-23 16:10:35,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,127 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:10:35,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,134 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:10:35,156 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 16:10:35,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 103 [2022-11-23 16:10:35,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,270 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-23 16:10:35,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 8 case distinctions, treesize of input 42 treesize of output 73 [2022-11-23 16:10:35,356 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 16:10:35,380 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:10:35,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 16:10:35,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 13 [2022-11-23 16:10:35,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 13 [2022-11-23 16:10:35,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,450 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 23 [2022-11-23 16:10:35,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 16:10:35,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 16:10:35,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,519 INFO L350 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 35 treesize of output 7 [2022-11-23 16:10:35,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,538 INFO L350 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 35 treesize of output 7 [2022-11-23 16:10:35,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:10:35,553 INFO L350 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 29 treesize of output 17 [2022-11-23 16:10:36,560 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 43 for LOIs [2022-11-23 16:10:37,499 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 156 for LOIs [2022-11-23 16:10:37,548 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:10:37,566 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:10:37,630 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:10:46,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1802844533] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:10:46,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:10:46,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [8, 8, 6] total 37 [2022-11-23 16:10:46,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945368269] [2022-11-23 16:10:46,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:10:46,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-23 16:10:46,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:10:46,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-23 16:10:46,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1190, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 16:10:46,501 INFO L87 Difference]: Start difference. First operand 126 states and 162 transitions. Second operand has 21 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:52,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:10:52,545 INFO L93 Difference]: Finished difference Result 200 states and 254 transitions. [2022-11-23 16:10:52,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-23 16:10:52,546 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 48 [2022-11-23 16:10:52,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:10:52,547 INFO L225 Difference]: With dead ends: 200 [2022-11-23 16:10:52,547 INFO L226 Difference]: Without dead ends: 141 [2022-11-23 16:10:52,549 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 14.2s TimeCoverageRelationStatistics Valid=259, Invalid=1811, Unknown=0, NotChecked=0, Total=2070 [2022-11-23 16:10:52,550 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 85 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 607 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-23 16:10:52,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 163 Invalid, 607 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 579 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-23 16:10:52,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-11-23 16:10:52,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 127. [2022-11-23 16:10:52,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 82 states have (on average 1.3048780487804879) internal successors, (107), 86 states have internal predecessors, (107), 28 states have call successors, (28), 14 states have call predecessors, (28), 16 states have return successors, (28), 26 states have call predecessors, (28), 26 states have call successors, (28) [2022-11-23 16:10:52,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 163 transitions. [2022-11-23 16:10:52,609 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 163 transitions. Word has length 48 [2022-11-23 16:10:52,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:10:52,610 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 163 transitions. [2022-11-23 16:10:52,610 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 16 states have (on average 1.5) internal successors, (24), 14 states have internal predecessors, (24), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-23 16:10:52,610 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 163 transitions. [2022-11-23 16:10:52,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-23 16:10:52,611 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:10:52,611 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:10:52,623 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-23 16:10:52,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:10:52,819 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:10:52,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:10:52,819 INFO L85 PathProgramCache]: Analyzing trace with hash -749602731, now seen corresponding path program 1 times [2022-11-23 16:10:52,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:10:52,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638541570] [2022-11-23 16:10:52,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:52,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:10:52,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:53,042 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-11-23 16:10:53,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:10:53,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638541570] [2022-11-23 16:10:53,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638541570] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:10:53,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778912678] [2022-11-23 16:10:53,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:10:53,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:10:53,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:10:53,048 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:10:53,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 16:10:53,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:10:53,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 78 conjunts are in the unsatisfiable core [2022-11-23 16:10:53,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:10:53,501 INFO L321 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-23 16:10:53,502 INFO L350 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-23 16:10:53,511 INFO L350 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 10 treesize of output 9 [2022-11-23 16:10:53,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 15 [2022-11-23 16:10:53,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 26 [2022-11-23 16:10:53,589 INFO L350 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 21 treesize of output 13 [2022-11-23 16:11:11,659 WARN L233 SmtUtils]: Spent 13.59s on a formula simplification that was a NOOP. DAG size: 87 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:11:16,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,511 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:11:16,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,518 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:11:16,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,522 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:11:16,535 INFO L321 Elim1Store]: treesize reduction 96, result has 1.0 percent of original size [2022-11-23 16:11:16,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 6 disjoint index pairs (out of 91 index pairs), introduced 11 new quantified variables, introduced 64 case distinctions, treesize of input 230 treesize of output 152 [2022-11-23 16:11:16,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,556 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:11:16,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:16,564 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:11:16,574 INFO L321 Elim1Store]: treesize reduction 72, result has 1.4 percent of original size [2022-11-23 16:11:16,575 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 6 disjoint index pairs (out of 78 index pairs), introduced 10 new quantified variables, introduced 51 case distinctions, treesize of input 111 treesize of output 53 [2022-11-23 16:11:16,590 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:11:16,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:11:22,200 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-23 16:11:22,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778912678] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:11:22,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1802564898] [2022-11-23 16:11:22,203 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:11:22,204 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:11:22,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:11:22,204 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:11:22,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:11:22,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,298 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:11:22,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:11:22,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:11:22,579 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:11:22,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,605 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:11:22,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:11:22,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:11:22,721 INFO L350 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 35 treesize of output 7 [2022-11-23 16:11:22,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:11:22,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,787 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:11:22,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:11:22,815 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:11:24,419 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 129 for LOIs [2022-11-23 16:11:24,502 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 158 for LOIs [2022-11-23 16:11:26,218 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2022-11-23 16:11:26,220 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:11:26,238 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:11:26,313 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:11:42,297 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6453#(and (= |#funAddr~s_can_fail_realloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= (select |#length| 3) 12) (<= 0 |__VERIFIER_assert_#in~cond|) (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19| Int)) (and (= (select |#length| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 32) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 8) 0) (< |#StackHeapBarrier| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 8) 0) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 24)) 0) 16) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 24) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 24) |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) (= (select |#valid| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 1) (not (= 2 |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 16) 0) (<= 0 |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) (not (= 3 |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|)) (not (= 4 |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|)) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 24)) 0) |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) (not (= 0 |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|)) (<= 0 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 24)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_19|) 16) 0))) (= 0 (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32))) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |#funAddr~s_can_fail_malloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.offset|) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32)) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= (select |#valid| 4) 1) (= |#funAddr~s_can_fail_calloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 1) 1) (= |#funAddr~s_can_fail_realloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= |#funAddr~s_can_fail_calloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 0) 0) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.base|) (= ~tl_last_error~0 0) (= |#funAddr~s_can_fail_malloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 40 (select |#length| 4)) (= 33 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (<= |__VERIFIER_assert_#in~cond| 1) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:11:42,298 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:11:42,298 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:11:42,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 19, 11] total 31 [2022-11-23 16:11:42,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988847717] [2022-11-23 16:11:42,298 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:11:42,299 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-23 16:11:42,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:11:42,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-23 16:11:42,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=2883, Unknown=31, NotChecked=0, Total=3306 [2022-11-23 16:11:42,302 INFO L87 Difference]: Start difference. First operand 127 states and 163 transitions. Second operand has 31 states, 25 states have (on average 2.64) internal successors, (66), 25 states have internal predecessors, (66), 11 states have call successors, (21), 6 states have call predecessors, (21), 10 states have return successors, (21), 9 states have call predecessors, (21), 11 states have call successors, (21) [2022-11-23 16:12:07,429 WARN L233 SmtUtils]: Spent 21.77s on a formula simplification that was a NOOP. DAG size: 141 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:12:13,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:13,262 INFO L93 Difference]: Finished difference Result 433 states and 572 transitions. [2022-11-23 16:12:13,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-11-23 16:12:13,263 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 25 states have (on average 2.64) internal successors, (66), 25 states have internal predecessors, (66), 11 states have call successors, (21), 6 states have call predecessors, (21), 10 states have return successors, (21), 9 states have call predecessors, (21), 11 states have call successors, (21) Word has length 48 [2022-11-23 16:12:13,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:13,267 INFO L225 Difference]: With dead ends: 433 [2022-11-23 16:12:13,267 INFO L226 Difference]: Without dead ends: 306 [2022-11-23 16:12:13,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 93 SyntacticMatches, 6 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2148 ImplicationChecksByTransitivity, 61.5s TimeCoverageRelationStatistics Valid=681, Invalid=5893, Unknown=68, NotChecked=0, Total=6642 [2022-11-23 16:12:13,271 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 149 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 1060 mSolverCounterSat, 88 mSolverCounterUnsat, 120 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 720 SdHoareTripleChecker+Invalid, 1268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1060 IncrementalHoareTripleChecker+Invalid, 120 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:13,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 720 Invalid, 1268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1060 Invalid, 120 Unknown, 0 Unchecked, 4.9s Time] [2022-11-23 16:12:13,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2022-11-23 16:12:13,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 208. [2022-11-23 16:12:13,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 142 states have (on average 1.3450704225352113) internal successors, (191), 149 states have internal predecessors, (191), 40 states have call successors, (40), 20 states have call predecessors, (40), 25 states have return successors, (47), 38 states have call predecessors, (47), 38 states have call successors, (47) [2022-11-23 16:12:13,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 278 transitions. [2022-11-23 16:12:13,412 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 278 transitions. Word has length 48 [2022-11-23 16:12:13,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:13,412 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 278 transitions. [2022-11-23 16:12:13,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 25 states have (on average 2.64) internal successors, (66), 25 states have internal predecessors, (66), 11 states have call successors, (21), 6 states have call predecessors, (21), 10 states have return successors, (21), 9 states have call predecessors, (21), 11 states have call successors, (21) [2022-11-23 16:12:13,413 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 278 transitions. [2022-11-23 16:12:13,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-11-23 16:12:13,414 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:13,414 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:13,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 16:12:13,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-11-23 16:12:13,621 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:13,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:13,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1009539423, now seen corresponding path program 1 times [2022-11-23 16:12:13,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:13,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993001478] [2022-11-23 16:12:13,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:13,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:13,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:14,032 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:12:14,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:14,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993001478] [2022-11-23 16:12:14,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [993001478] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:12:14,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159653641] [2022-11-23 16:12:14,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:14,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:14,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:14,034 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:14,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 16:12:14,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:14,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-23 16:12:14,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:12:14,433 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:12:14,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159653641] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:12:14,433 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:12:14,433 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [11] total 16 [2022-11-23 16:12:14,433 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172874908] [2022-11-23 16:12:14,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:12:14,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 16:12:14,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:14,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 16:12:14,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2022-11-23 16:12:14,435 INFO L87 Difference]: Start difference. First operand 208 states and 278 transitions. Second operand has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 16:12:14,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:14,757 INFO L93 Difference]: Finished difference Result 341 states and 447 transitions. [2022-11-23 16:12:14,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 16:12:14,758 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 51 [2022-11-23 16:12:14,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:14,760 INFO L225 Difference]: With dead ends: 341 [2022-11-23 16:12:14,760 INFO L226 Difference]: Without dead ends: 210 [2022-11-23 16:12:14,761 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2022-11-23 16:12:14,761 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 33 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:14,762 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 176 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:12:14,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2022-11-23 16:12:14,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 208. [2022-11-23 16:12:14,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 142 states have (on average 1.323943661971831) internal successors, (188), 149 states have internal predecessors, (188), 40 states have call successors, (40), 20 states have call predecessors, (40), 25 states have return successors, (47), 38 states have call predecessors, (47), 38 states have call successors, (47) [2022-11-23 16:12:14,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 275 transitions. [2022-11-23 16:12:14,902 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 275 transitions. Word has length 51 [2022-11-23 16:12:14,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:14,903 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 275 transitions. [2022-11-23 16:12:14,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.333333333333333) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 16:12:14,903 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 275 transitions. [2022-11-23 16:12:14,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-11-23 16:12:14,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:14,905 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:12:14,912 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-23 16:12:15,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 16:12:15,112 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:15,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:15,112 INFO L85 PathProgramCache]: Analyzing trace with hash 2042660187, now seen corresponding path program 1 times [2022-11-23 16:12:15,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:15,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768739960] [2022-11-23 16:12:15,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:15,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:15,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:15,609 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 16:12:15,609 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:15,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768739960] [2022-11-23 16:12:15,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [768739960] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:12:15,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957653826] [2022-11-23 16:12:15,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:15,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:15,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:15,615 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:15,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 16:12:15,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:15,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-23 16:12:15,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:16,086 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 16:12:16,086 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 16:12:16,086 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957653826] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:12:16,086 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 16:12:16,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [12] total 18 [2022-11-23 16:12:16,086 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520580705] [2022-11-23 16:12:16,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:12:16,087 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:12:16,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:16,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:12:16,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2022-11-23 16:12:16,088 INFO L87 Difference]: Start difference. First operand 208 states and 275 transitions. Second operand has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 8 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 16:12:16,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:12:16,485 INFO L93 Difference]: Finished difference Result 377 states and 485 transitions. [2022-11-23 16:12:16,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 16:12:16,486 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 8 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2022-11-23 16:12:16,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:12:16,488 INFO L225 Difference]: With dead ends: 377 [2022-11-23 16:12:16,488 INFO L226 Difference]: Without dead ends: 243 [2022-11-23 16:12:16,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=395, Unknown=0, NotChecked=0, Total=462 [2022-11-23 16:12:16,490 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 49 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 16:12:16,490 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 202 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 16:12:16,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2022-11-23 16:12:16,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 214. [2022-11-23 16:12:16,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 146 states have (on average 1.3013698630136987) internal successors, (190), 154 states have internal predecessors, (190), 41 states have call successors, (41), 20 states have call predecessors, (41), 26 states have return successors, (49), 39 states have call predecessors, (49), 39 states have call successors, (49) [2022-11-23 16:12:16,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 280 transitions. [2022-11-23 16:12:16,591 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 280 transitions. Word has length 53 [2022-11-23 16:12:16,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:12:16,592 INFO L495 AbstractCegarLoop]: Abstraction has 214 states and 280 transitions. [2022-11-23 16:12:16,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.857142857142857) internal successors, (34), 8 states have internal predecessors, (34), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-23 16:12:16,592 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 280 transitions. [2022-11-23 16:12:16,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-23 16:12:16,594 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:12:16,594 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2022-11-23 16:12:16,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 16:12:16,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:16,802 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:12:16,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:12:16,802 INFO L85 PathProgramCache]: Analyzing trace with hash 475793178, now seen corresponding path program 1 times [2022-11-23 16:12:16,802 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:12:16,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924555300] [2022-11-23 16:12:16,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:16,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:12:16,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:17,024 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 16:12:17,024 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:12:17,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924555300] [2022-11-23 16:12:17,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924555300] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:12:17,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094495094] [2022-11-23 16:12:17,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:12:17,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:12:17,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:12:17,026 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:12:17,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 16:12:17,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:12:17,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 84 conjunts are in the unsatisfiable core [2022-11-23 16:12:17,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:12:17,542 INFO L321 Elim1Store]: treesize reduction 30, result has 38.8 percent of original size [2022-11-23 16:12:17,543 INFO L350 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 78 [2022-11-23 16:12:17,550 INFO L350 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 10 treesize of output 9 [2022-11-23 16:12:17,557 INFO L350 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 10 treesize of output 9 [2022-11-23 16:12:17,597 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 7 [2022-11-23 16:12:17,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-11-23 16:12:26,344 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 11 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-23 16:12:26,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:12:31,412 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 3 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-11-23 16:12:31,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094495094] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:12:31,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197592686] [2022-11-23 16:12:31,414 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:12:31,415 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:12:31,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:12:31,415 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:12:31,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:12:31,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,483 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-23 16:12:31,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 50 [2022-11-23 16:12:31,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,553 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:12:31,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:12:31,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:12:31,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:12:31,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:12:31,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,898 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:12:31,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,947 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:12:31,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:31,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:12:32,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:12:32,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:12:32,049 INFO L350 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 35 treesize of output 7 [2022-11-23 16:12:33,525 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 126 for LOIs [2022-11-23 16:12:33,598 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 17 for LOIs [2022-11-23 16:12:34,339 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2022-11-23 16:12:34,340 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:12:34,357 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:12:34,418 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:12:47,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9810#(and (= |#funAddr~s_can_fail_realloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= (select |#length| 3) 12) (<= 0 |__VERIFIER_assert_#in~cond|) (= 0 (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32))) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |#funAddr~s_can_fail_malloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.offset|) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32)) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= (select |#valid| 4) 1) (= |#funAddr~s_can_fail_calloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 1) 1) (= |#funAddr~s_can_fail_realloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= |#funAddr~s_can_fail_calloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 0) 0) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.base|) (= ~tl_last_error~0 0) (= |#funAddr~s_can_fail_malloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 40 (select |#length| 4)) (= 33 (select |#length| 2)) (exists ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113| Int)) (and (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 24) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) (= (select |#valid| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 1) (not (= 3 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|)) (< |#StackHeapBarrier| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) (not (= 4 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|)) (= 32 (select |#length| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 8) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 16) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 16) 0) (not (= 0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 8) 0) (not (= 2 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 0) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) (<= 0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 24) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_113|) 0) 16))) (= (select (select |#memory_int| 1) 1) 0) (<= |__VERIFIER_assert_#in~cond| 1) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:12:47,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:12:47,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:12:47,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 17, 11] total 30 [2022-11-23 16:12:47,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955266913] [2022-11-23 16:12:47,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:12:47,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 16:12:47,944 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:12:47,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 16:12:47,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=2832, Unknown=0, NotChecked=0, Total=3192 [2022-11-23 16:12:47,946 INFO L87 Difference]: Start difference. First operand 214 states and 280 transitions. Second operand has 30 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 26 states have internal predecessors, (75), 12 states have call successors, (23), 5 states have call predecessors, (23), 9 states have return successors, (23), 11 states have call predecessors, (23), 12 states have call successors, (23) [2022-11-23 16:12:50,738 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:12:52,932 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:13:03,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:13:03,656 INFO L93 Difference]: Finished difference Result 641 states and 826 transitions. [2022-11-23 16:13:03,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-11-23 16:13:03,657 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 26 states have internal predecessors, (75), 12 states have call successors, (23), 5 states have call predecessors, (23), 9 states have return successors, (23), 11 states have call predecessors, (23), 12 states have call successors, (23) Word has length 56 [2022-11-23 16:13:03,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:13:03,660 INFO L225 Difference]: With dead ends: 641 [2022-11-23 16:13:03,660 INFO L226 Difference]: Without dead ends: 501 [2022-11-23 16:13:03,663 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 113 SyntacticMatches, 11 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2613 ImplicationChecksByTransitivity, 27.3s TimeCoverageRelationStatistics Valid=890, Invalid=7120, Unknown=0, NotChecked=0, Total=8010 [2022-11-23 16:13:03,664 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 249 mSDsluCounter, 364 mSDsCounter, 0 mSdLazyCounter, 1197 mSolverCounterSat, 242 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 406 SdHoareTripleChecker+Invalid, 1441 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 1197 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:13:03,664 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 406 Invalid, 1441 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 1197 Invalid, 2 Unknown, 0 Unchecked, 7.3s Time] [2022-11-23 16:13:03,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2022-11-23 16:13:03,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 338. [2022-11-23 16:13:03,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 231 states have (on average 1.2467532467532467) internal successors, (288), 245 states have internal predecessors, (288), 64 states have call successors, (64), 32 states have call predecessors, (64), 42 states have return successors, (74), 60 states have call predecessors, (74), 60 states have call successors, (74) [2022-11-23 16:13:03,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 426 transitions. [2022-11-23 16:13:03,867 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 426 transitions. Word has length 56 [2022-11-23 16:13:03,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:13:03,868 INFO L495 AbstractCegarLoop]: Abstraction has 338 states and 426 transitions. [2022-11-23 16:13:03,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 26 states have internal predecessors, (75), 12 states have call successors, (23), 5 states have call predecessors, (23), 9 states have return successors, (23), 11 states have call predecessors, (23), 12 states have call successors, (23) [2022-11-23 16:13:03,868 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 426 transitions. [2022-11-23 16:13:03,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 16:13:03,870 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:13:03,870 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-23 16:13:03,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 16:13:04,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:04,079 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:13:04,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:13:04,079 INFO L85 PathProgramCache]: Analyzing trace with hash -1794446121, now seen corresponding path program 1 times [2022-11-23 16:13:04,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:13:04,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334266731] [2022-11-23 16:13:04,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:04,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:13:04,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:04,979 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-23 16:13:04,979 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:13:04,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334266731] [2022-11-23 16:13:04,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334266731] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:13:04,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120890799] [2022-11-23 16:13:04,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:04,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:04,980 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:13:04,981 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:13:04,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 16:13:05,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:05,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-23 16:13:05,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:13:05,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 14 [2022-11-23 16:13:05,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:05,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 16 [2022-11-23 16:13:05,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:05,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:05,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 21 [2022-11-23 16:13:05,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:05,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 20 [2022-11-23 16:13:06,079 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 35 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-23 16:13:06,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:13:06,526 WARN L837 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1342 Int) (v_ArrVal_1341 (Array Int Int)) (v_ArrVal_1340 (Array Int Int))) (not (= (+ 16 |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|) (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_1341) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base| (store (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base| v_ArrVal_1340) |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base|) (+ |c_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset| 24) v_ArrVal_1342)) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base|) |c_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.offset|)))) is different from false [2022-11-23 16:13:06,541 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:13:06,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 35 [2022-11-23 16:13:06,564 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:13:06,565 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 267 treesize of output 277 [2022-11-23 16:13:06,573 INFO L350 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 306 treesize of output 298 [2022-11-23 16:13:06,591 INFO L350 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 298 treesize of output 294 [2022-11-23 16:13:06,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 4 [2022-11-23 16:13:06,729 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:13:06,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 66 treesize of output 68 [2022-11-23 16:13:06,837 INFO L350 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 6 [2022-11-23 16:13:06,862 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:13:06,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 52 [2022-11-23 16:13:07,095 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 1 not checked. [2022-11-23 16:13:07,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120890799] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:13:07,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910629622] [2022-11-23 16:13:07,098 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:13:07,098 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:13:07,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:13:07,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:13:07,099 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:13:07,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,169 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-23 16:13:07,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 50 [2022-11-23 16:13:07,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,238 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:13:07,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:13:07,455 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:13:07,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:13:07,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:13:07,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,539 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:13:07,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,593 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:13:07,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,599 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:13:07,618 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 16:13:07,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 103 [2022-11-23 16:13:07,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,673 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,676 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:13:07,697 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 16:13:07,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 16 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 1 case distinctions, treesize of input 91 treesize of output 103 [2022-11-23 16:13:07,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 7 [2022-11-23 16:13:07,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,830 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-23 16:13:07,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 8 case distinctions, treesize of input 42 treesize of output 73 [2022-11-23 16:13:07,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 17 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 46 [2022-11-23 16:13:07,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:13:07,959 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 16:13:07,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 16:13:07,993 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:13:07,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:07,996 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 16:13:08,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 23 [2022-11-23 16:13:08,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:13:08,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:13:08,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 16:13:08,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,144 INFO L350 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 35 treesize of output 7 [2022-11-23 16:13:08,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,164 INFO L350 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 35 treesize of output 7 [2022-11-23 16:13:08,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:08,186 INFO L350 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 29 treesize of output 17 [2022-11-23 16:13:10,690 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 44 for LOIs [2022-11-23 16:13:10,712 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 19 for LOIs [2022-11-23 16:13:11,535 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 15 for LOIs [2022-11-23 16:13:11,543 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:13:11,564 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:13:11,631 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:13:21,498 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11738#(and (<= 0 |__VERIFIER_assert_#in~cond|) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (exists ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139| Int) (|v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| Int)) (and (= (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 16) (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24))) (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24)))) (<= |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 0) (<= 0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139|) (<= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24)) 0) (<= 0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24))) (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24))) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (<= 0 (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.base_BEFORE_CALL_139|) (+ |v_ULTIMATE.start_ensure_linked_list_is_allocated_~list#1.offset_BEFORE_CALL_139| 24))))) (= ~tl_last_error~0 0) (= |#NULL.offset| 0) (<= |__VERIFIER_assert_#in~cond| 1) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:13:21,499 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:13:21,499 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:13:21,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 11] total 32 [2022-11-23 16:13:21,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286466433] [2022-11-23 16:13:21,499 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:13:21,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-23 16:13:21,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:13:21,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-23 16:13:21,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=3071, Unknown=1, NotChecked=112, Total=3422 [2022-11-23 16:13:21,502 INFO L87 Difference]: Start difference. First operand 338 states and 426 transitions. Second operand has 32 states, 29 states have (on average 3.103448275862069) internal successors, (90), 31 states have internal predecessors, (90), 13 states have call successors, (26), 3 states have call predecessors, (26), 7 states have return successors, (25), 10 states have call predecessors, (25), 13 states have call successors, (25) [2022-11-23 16:13:25,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:13:25,705 INFO L93 Difference]: Finished difference Result 569 states and 705 transitions. [2022-11-23 16:13:25,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-23 16:13:25,706 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 29 states have (on average 3.103448275862069) internal successors, (90), 31 states have internal predecessors, (90), 13 states have call successors, (26), 3 states have call predecessors, (26), 7 states have return successors, (25), 10 states have call predecessors, (25), 13 states have call successors, (25) Word has length 67 [2022-11-23 16:13:25,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:13:25,708 INFO L225 Difference]: With dead ends: 569 [2022-11-23 16:13:25,709 INFO L226 Difference]: Without dead ends: 371 [2022-11-23 16:13:25,711 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 159 SyntacticMatches, 5 SemanticMatches, 78 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1850 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=523, Invalid=5642, Unknown=1, NotChecked=154, Total=6320 [2022-11-23 16:13:25,712 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 391 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 1698 mSolverCounterSat, 297 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 412 SdHoareTripleChecker+Valid, 868 SdHoareTripleChecker+Invalid, 2145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 297 IncrementalHoareTripleChecker+Valid, 1698 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-11-23 16:13:25,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [412 Valid, 868 Invalid, 2145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [297 Valid, 1698 Invalid, 0 Unknown, 150 Unchecked, 2.3s Time] [2022-11-23 16:13:25,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-11-23 16:13:25,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 275. [2022-11-23 16:13:25,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 189 states have (on average 1.2328042328042328) internal successors, (233), 198 states have internal predecessors, (233), 52 states have call successors, (52), 26 states have call predecessors, (52), 33 states have return successors, (58), 50 states have call predecessors, (58), 49 states have call successors, (58) [2022-11-23 16:13:25,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 343 transitions. [2022-11-23 16:13:25,885 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 343 transitions. Word has length 67 [2022-11-23 16:13:25,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:13:25,885 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 343 transitions. [2022-11-23 16:13:25,885 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 29 states have (on average 3.103448275862069) internal successors, (90), 31 states have internal predecessors, (90), 13 states have call successors, (26), 3 states have call predecessors, (26), 7 states have return successors, (25), 10 states have call predecessors, (25), 13 states have call successors, (25) [2022-11-23 16:13:25,886 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 343 transitions. [2022-11-23 16:13:25,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-11-23 16:13:25,887 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:13:25,888 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-23 16:13:25,899 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-23 16:13:26,095 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-11-23 16:13:26,096 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:13:26,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:13:26,096 INFO L85 PathProgramCache]: Analyzing trace with hash 1822501617, now seen corresponding path program 1 times [2022-11-23 16:13:26,096 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:13:26,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462645741] [2022-11-23 16:13:26,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:26,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:13:26,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:28,999 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 13 proven. 27 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-23 16:13:28,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:13:28,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462645741] [2022-11-23 16:13:28,999 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462645741] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:13:28,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324511386] [2022-11-23 16:13:29,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:13:29,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:13:29,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:13:29,001 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:13:29,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 16:13:29,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:13:29,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 127 conjunts are in the unsatisfiable core [2022-11-23 16:13:29,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:13:33,831 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 24 proven. 33 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 16:13:33,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:13:43,473 INFO L321 Elim1Store]: treesize reduction 17, result has 80.5 percent of original size [2022-11-23 16:13:43,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 94 treesize of output 131 [2022-11-23 16:13:46,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [324511386] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:13:46,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [675493511] [2022-11-23 16:13:46,725 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:13:46,725 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:13:46,725 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:13:46,726 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:13:46,726 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:13:46,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:46,820 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:13:46,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:13:46,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:46,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:13:47,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:13:47,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:13:47,168 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:13:47,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,193 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:13:47,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:13:47,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,289 INFO L350 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 35 treesize of output 7 [2022-11-23 16:13:47,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,318 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:13:47,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:13:47,388 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:13:57,967 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 145 for LOIs [2022-11-23 16:13:58,188 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 34 for LOIs [2022-11-23 16:13:59,350 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 135 for LOIs [2022-11-23 16:13:59,388 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:13:59,409 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:13:59,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:14:24,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13368#(and (= |#funAddr~s_can_fail_realloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= (select |#length| 3) 12) (exists ((|v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86| Int)) (and (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 8) 0) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 16) 0) (< |#StackHeapBarrier| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 8) 0) (<= 0 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) 16) (= 32 (select |#length| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0))) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 24) 0) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) 0)) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) 4)) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 24) |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0)) 16) 0) (= 1 (select |#valid| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0))) (<= 0 |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) 3)) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_ensure_linked_list_is_allocated_~curr~0#1.base_BEFORE_CALL_86|) 0) 2)))) (= 0 (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32))) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |#funAddr~s_can_fail_malloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.offset|) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32)) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (<= ~tl_last_error~0 0) (= (select |#valid| 4) 1) (= |#funAddr~s_can_fail_calloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 1) 1) (= |#funAddr~s_can_fail_realloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (<= 0 ~tl_last_error~0) (= |#funAddr~s_can_fail_calloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 0) 0) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.base|) (= |#funAddr~s_can_fail_malloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= (select (select |#memory_int| 1) 0) 48) (= 40 (select |#length| 4)) (= 33 (select |#length| 2)) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:14:24,175 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:14:24,175 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 16:14:24,175 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 42 [2022-11-23 16:14:24,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325255404] [2022-11-23 16:14:24,175 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 16:14:24,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-23 16:14:24,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:14:24,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-23 16:14:24,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=451, Invalid=5869, Unknown=0, NotChecked=0, Total=6320 [2022-11-23 16:14:24,178 INFO L87 Difference]: Start difference. First operand 275 states and 343 transitions. Second operand has 42 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (21), 4 states have call predecessors, (21), 11 states have return successors, (20), 14 states have call predecessors, (20), 14 states have call successors, (20) [2022-11-23 16:14:29,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:14:29,957 INFO L93 Difference]: Finished difference Result 447 states and 562 transitions. [2022-11-23 16:14:29,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-23 16:14:29,959 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (21), 4 states have call predecessors, (21), 11 states have return successors, (20), 14 states have call predecessors, (20), 14 states have call successors, (20) Word has length 67 [2022-11-23 16:14:29,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:14:29,961 INFO L225 Difference]: With dead ends: 447 [2022-11-23 16:14:29,962 INFO L226 Difference]: Without dead ends: 340 [2022-11-23 16:14:29,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 100 SyntacticMatches, 10 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3316 ImplicationChecksByTransitivity, 32.5s TimeCoverageRelationStatistics Valid=851, Invalid=9655, Unknown=0, NotChecked=0, Total=10506 [2022-11-23 16:14:29,966 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 219 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 1622 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 632 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 1622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-11-23 16:14:29,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 632 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 1622 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-11-23 16:14:29,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-11-23 16:14:30,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 275. [2022-11-23 16:14:30,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 189 states have (on average 1.1957671957671958) internal successors, (226), 198 states have internal predecessors, (226), 52 states have call successors, (52), 26 states have call predecessors, (52), 33 states have return successors, (58), 50 states have call predecessors, (58), 49 states have call successors, (58) [2022-11-23 16:14:30,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 336 transitions. [2022-11-23 16:14:30,234 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 336 transitions. Word has length 67 [2022-11-23 16:14:30,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:14:30,236 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 336 transitions. [2022-11-23 16:14:30,236 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 35 states have (on average 2.2285714285714286) internal successors, (78), 35 states have internal predecessors, (78), 15 states have call successors, (21), 4 states have call predecessors, (21), 11 states have return successors, (20), 14 states have call predecessors, (20), 14 states have call successors, (20) [2022-11-23 16:14:30,237 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 336 transitions. [2022-11-23 16:14:30,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-11-23 16:14:30,239 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:14:30,240 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2022-11-23 16:14:30,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-23 16:14:30,448 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:30,448 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:14:30,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:14:30,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1648656330, now seen corresponding path program 1 times [2022-11-23 16:14:30,449 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:14:30,449 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089023718] [2022-11-23 16:14:30,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:30,450 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:14:30,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:30,756 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-23 16:14:30,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:14:30,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089023718] [2022-11-23 16:14:30,756 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089023718] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:14:30,757 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886636429] [2022-11-23 16:14:30,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:14:30,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:14:30,757 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:14:30,759 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:14:30,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 16:14:31,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:14:31,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-23 16:14:31,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:14:33,437 WARN L859 $PredicateComparison]: unable to prove that (or (exists ((|v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66| Int) (|v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|) |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|) |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|))) (exists ((|v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66| Int) (|v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56| Int)) (not (= (+ 16 |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|) (select (select |c_#memory_$Pointer$.offset| |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|) |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|))))) is different from true [2022-11-23 16:14:35,547 WARN L859 $PredicateComparison]: unable to prove that (or (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_218| Int)) (not (= (select (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_218|) 0) 16))) (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_218| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_218|) 0) |v_ULTIMATE.start_aws_linked_list_rbegin_harness_~#list~0#1.base_BEFORE_CALL_218|)))) is different from true [2022-11-23 16:14:37,682 WARN L859 $PredicateComparison]: unable to prove that (or (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67| Int)) (not (= 16 (select (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|) 0)))) (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|) 0) |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|)))) is different from true [2022-11-23 16:14:47,780 WARN L233 SmtUtils]: Spent 8.04s on a formula simplification that was a NOOP. DAG size: 23 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:15:01,888 WARN L233 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 23 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:15:12,003 WARN L233 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 27 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:15:22,176 WARN L233 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 31 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:15:30,305 WARN L233 SmtUtils]: Spent 8.04s on a formula simplification that was a NOOP. DAG size: 26 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:15:30,343 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 51 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 2 not checked. [2022-11-23 16:15:30,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:15:33,175 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:33,176 INFO L350 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 28 treesize of output 31 [2022-11-23 16:15:33,189 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:15:33,190 INFO L350 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 22 treesize of output 25 [2022-11-23 16:15:33,277 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 0 proven. 47 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-23 16:15:33,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886636429] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:15:33,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543539558] [2022-11-23 16:15:33,280 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:15:33,280 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:15:33,280 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:15:33,281 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:15:33,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:15:33,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,373 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:15:33,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:15:33,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,393 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 11 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 38 [2022-11-23 16:15:33,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,613 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:15:33,634 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:15:33,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:15:33,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:15:33,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,748 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,749 INFO L350 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 50 treesize of output 28 [2022-11-23 16:15:33,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,844 INFO L321 Elim1Store]: treesize reduction 72, result has 33.9 percent of original size [2022-11-23 16:15:33,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 8 case distinctions, treesize of input 42 treesize of output 73 [2022-11-23 16:15:33,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 17 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 46 [2022-11-23 16:15:33,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,903 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:33,905 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 20 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:15:33,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 6 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 7 [2022-11-23 16:15:33,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:33,982 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 20 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:15:34,193 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,195 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,203 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,211 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,222 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,224 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,649 INFO L321 Elim1Store]: treesize reduction 227, result has 25.3 percent of original size [2022-11-23 16:15:34,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 12 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 662 treesize of output 671 [2022-11-23 16:15:34,716 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,719 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,720 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:34,732 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:34,736 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:35,041 INFO L321 Elim1Store]: treesize reduction 233, result has 26.3 percent of original size [2022-11-23 16:15:35,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 12 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 28 case distinctions, treesize of input 676 treesize of output 685 [2022-11-23 16:15:35,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:35,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:15:35,372 INFO L321 Elim1Store]: treesize reduction 196, result has 21.9 percent of original size [2022-11-23 16:15:35,372 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 11 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 23 case distinctions, treesize of input 648 treesize of output 678 [2022-11-23 16:15:35,529 INFO L321 Elim1Store]: treesize reduction 110, result has 15.4 percent of original size [2022-11-23 16:15:35,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 641 treesize of output 652 [2022-11-23 16:15:35,581 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:35,611 INFO L321 Elim1Store]: treesize reduction 45, result has 13.5 percent of original size [2022-11-23 16:15:35,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 678 treesize of output 631 [2022-11-23 16:15:35,643 INFO L350 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 652 treesize of output 631 [2022-11-23 16:15:37,844 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 9 [2022-11-23 16:15:37,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-23 16:15:37,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:37,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 16:15:37,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:37,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 13 [2022-11-23 16:15:37,931 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 16:15:37,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:37,934 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 23 [2022-11-23 16:15:37,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:37,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 19 [2022-11-23 16:15:37,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:37,991 INFO L350 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 35 treesize of output 7 [2022-11-23 16:15:38,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:38,009 INFO L350 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 35 treesize of output 7 [2022-11-23 16:15:38,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:38,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:38,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 16:15:38,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:15:38,038 INFO L350 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 29 treesize of output 17 [2022-11-23 16:15:39,271 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2022-11-23 16:15:39,276 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 34 for LOIs [2022-11-23 16:15:40,611 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 135 for LOIs [2022-11-23 16:15:40,652 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:15:40,669 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:15:40,736 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:15:50,141 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14942#(and (<= 0 |__VERIFIER_assert_#in~cond|) (= |~#s_can_fail_allocator_static~0.base| 4) (= (mod __VERIFIER_assert_~cond 256) 0) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= ~tl_last_error~0 0) (= |#NULL.offset| 0) (<= |__VERIFIER_assert_#in~cond| 1) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:15:50,141 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:15:50,141 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:15:50,141 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 18, 14] total 30 [2022-11-23 16:15:50,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834647266] [2022-11-23 16:15:50,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:15:50,142 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-23 16:15:50,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:15:50,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-23 16:15:50,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=2744, Unknown=10, NotChecked=324, Total=3306 [2022-11-23 16:15:50,144 INFO L87 Difference]: Start difference. First operand 275 states and 336 transitions. Second operand has 30 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 12 states have call successors, (24), 5 states have call predecessors, (24), 10 states have return successors, (24), 10 states have call predecessors, (24), 12 states have call successors, (24) [2022-11-23 16:15:52,451 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:15:54,469 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:15:56,473 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:15:58,493 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:00,504 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:02,529 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:04,543 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:06,556 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:08,563 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:10,629 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:12,637 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:14,644 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:16,648 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:18,664 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:20,667 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:26,720 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:28,724 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:30,745 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:32,752 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:38,813 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:40,817 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:42,829 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:50,886 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:52,893 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:16:58,974 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:00,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:02,985 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:04,990 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:06,994 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:09,025 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:11,030 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:13,036 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:15,044 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:17,046 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:19,050 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:17:31,534 WARN L233 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 20 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:17:49,993 WARN L233 SmtUtils]: Spent 8.03s on a formula simplification that was a NOOP. DAG size: 29 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:17:58,090 WARN L233 SmtUtils]: Spent 8.04s on a formula simplification that was a NOOP. DAG size: 33 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:18:14,256 WARN L233 SmtUtils]: Spent 16.11s on a formula simplification. DAG size of input: 46 DAG size of output: 45 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:18:30,431 WARN L233 SmtUtils]: Spent 16.12s on a formula simplification. DAG size of input: 50 DAG size of output: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:18:32,494 WARN L859 $PredicateComparison]: unable to prove that (and (or (exists ((|v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66| Int) (|v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|) |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|) |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|))) (exists ((|v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66| Int) (|v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56| Int)) (not (= (+ 16 |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|) (select (select |c_#memory_$Pointer$.offset| |v_aws_linked_list_is_valid_#in~list#1.base_BEFORE_CALL_56|) |v_aws_linked_list_is_valid_#in~list#1.offset_BEFORE_CALL_66|))))) (or (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67| Int)) (not (= 16 (select (select |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|) 0)))) (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67| Int)) (not (= (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|) 0) |v_ULTIMATE.start_aws_linked_list_rbegin_~list#1.base_BEFORE_CALL_67|))))) is different from true [2022-11-23 16:18:40,583 WARN L233 SmtUtils]: Spent 8.05s on a formula simplification that was a NOOP. DAG size: 37 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:18:50,694 WARN L233 SmtUtils]: Spent 8.05s on a formula simplification that was a NOOP. DAG size: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:18:58,845 WARN L233 SmtUtils]: Spent 8.05s on a formula simplification that was a NOOP. DAG size: 39 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:19:06,955 WARN L233 SmtUtils]: Spent 8.05s on a formula simplification that was a NOOP. DAG size: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:19:09,108 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:17,169 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:19,174 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:25,239 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:27,243 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:37,313 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:39,317 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:41,323 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:43,326 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:45,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:47,453 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:49,458 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:51,463 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:53,471 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:55,473 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:57,507 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:19:59,512 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:20:11,584 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:20:13,589 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:20:27,665 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:20:29,669 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 16:20:30,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:20:30,300 INFO L93 Difference]: Finished difference Result 552 states and 678 transitions. [2022-11-23 16:20:30,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-23 16:20:30,301 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 12 states have call successors, (24), 5 states have call predecessors, (24), 10 states have return successors, (24), 10 states have call predecessors, (24), 12 states have call successors, (24) Word has length 71 [2022-11-23 16:20:30,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:20:30,303 INFO L225 Difference]: With dead ends: 552 [2022-11-23 16:20:30,303 INFO L226 Difference]: Without dead ends: 372 [2022-11-23 16:20:30,305 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 152 SyntacticMatches, 10 SemanticMatches, 82 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 1890 ImplicationChecksByTransitivity, 236.3s TimeCoverageRelationStatistics Valid=486, Invalid=5802, Unknown=48, NotChecked=636, Total=6972 [2022-11-23 16:20:30,305 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 111 mSDsluCounter, 608 mSDsCounter, 0 mSdLazyCounter, 1261 mSolverCounterSat, 99 mSolverCounterUnsat, 56 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 113.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 1823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 1261 IncrementalHoareTripleChecker+Invalid, 56 IncrementalHoareTripleChecker+Unknown, 407 IncrementalHoareTripleChecker+Unchecked, 114.0s IncrementalHoareTripleChecker+Time [2022-11-23 16:20:30,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 672 Invalid, 1823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 1261 Invalid, 56 Unknown, 407 Unchecked, 114.0s Time] [2022-11-23 16:20:30,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2022-11-23 16:20:30,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 322. [2022-11-23 16:20:30,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 224 states have (on average 1.1517857142857142) internal successors, (258), 230 states have internal predecessors, (258), 58 states have call successors, (58), 36 states have call predecessors, (58), 39 states have return successors, (62), 55 states have call predecessors, (62), 55 states have call successors, (62) [2022-11-23 16:20:30,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 378 transitions. [2022-11-23 16:20:30,499 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 378 transitions. Word has length 71 [2022-11-23 16:20:30,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:20:30,500 INFO L495 AbstractCegarLoop]: Abstraction has 322 states and 378 transitions. [2022-11-23 16:20:30,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 26 states have (on average 3.230769230769231) internal successors, (84), 27 states have internal predecessors, (84), 12 states have call successors, (24), 5 states have call predecessors, (24), 10 states have return successors, (24), 10 states have call predecessors, (24), 12 states have call successors, (24) [2022-11-23 16:20:30,500 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 378 transitions. [2022-11-23 16:20:30,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-11-23 16:20:30,501 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:20:30,502 INFO L195 NwaCegarLoop]: trace histogram [6, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 16:20:30,509 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-23 16:20:30,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-23 16:20:30,709 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:20:30,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:20:30,709 INFO L85 PathProgramCache]: Analyzing trace with hash -1272987309, now seen corresponding path program 1 times [2022-11-23 16:20:30,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:20:30,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935445648] [2022-11-23 16:20:30,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:20:30,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:20:30,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:20:30,938 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-23 16:20:30,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:20:30,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935445648] [2022-11-23 16:20:30,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935445648] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 16:20:30,939 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 16:20:30,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-23 16:20:30,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9021748] [2022-11-23 16:20:30,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 16:20:30,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 16:20:30,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:20:30,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 16:20:30,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-23 16:20:30,941 INFO L87 Difference]: Start difference. First operand 322 states and 378 transitions. Second operand has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2022-11-23 16:20:31,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 16:20:31,426 INFO L93 Difference]: Finished difference Result 370 states and 431 transitions. [2022-11-23 16:20:31,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 16:20:31,427 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 70 [2022-11-23 16:20:31,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 16:20:31,430 INFO L225 Difference]: With dead ends: 370 [2022-11-23 16:20:31,430 INFO L226 Difference]: Without dead ends: 368 [2022-11-23 16:20:31,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-11-23 16:20:31,432 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 10 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 16:20:31,432 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 275 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 16:20:31,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 368 states. [2022-11-23 16:20:31,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 368 to 349. [2022-11-23 16:20:31,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 242 states have (on average 1.140495867768595) internal successors, (276), 251 states have internal predecessors, (276), 61 states have call successors, (61), 39 states have call predecessors, (61), 45 states have return successors, (71), 58 states have call predecessors, (71), 58 states have call successors, (71) [2022-11-23 16:20:31,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 408 transitions. [2022-11-23 16:20:31,718 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 408 transitions. Word has length 70 [2022-11-23 16:20:31,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 16:20:31,719 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 408 transitions. [2022-11-23 16:20:31,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2022-11-23 16:20:31,719 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 408 transitions. [2022-11-23 16:20:31,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-11-23 16:20:31,720 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 16:20:31,721 INFO L195 NwaCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 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] [2022-11-23 16:20:31,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-23 16:20:31,721 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-23 16:20:31,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 16:20:31,721 INFO L85 PathProgramCache]: Analyzing trace with hash -588384080, now seen corresponding path program 2 times [2022-11-23 16:20:31,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 16:20:31,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73773239] [2022-11-23 16:20:31,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 16:20:31,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 16:20:31,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 16:20:33,506 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 17 proven. 38 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-11-23 16:20:33,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 16:20:33,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73773239] [2022-11-23 16:20:33,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73773239] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 16:20:33,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222810647] [2022-11-23 16:20:33,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 16:20:33,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 16:20:33,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 16:20:33,509 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 16:20:33,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_296e39fa-1210-4e35-98a6-285305e60e5a/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 16:20:33,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 16:20:33,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 16:20:33,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-23 16:20:33,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 16:20:58,873 WARN L233 SmtUtils]: Spent 10.04s on a formula simplification that was a NOOP. DAG size: 28 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:20:59,118 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 57 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-23 16:20:59,118 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 16:20:59,854 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:20:59,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 29 [2022-11-23 16:20:59,866 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 16:20:59,866 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 27 [2022-11-23 16:20:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 35 proven. 21 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-23 16:20:59,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222810647] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 16:20:59,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1772941794] [2022-11-23 16:20:59,963 INFO L159 IcfgInterpreter]: Started Sifa with 35 locations of interest [2022-11-23 16:20:59,963 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 16:20:59,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 16:20:59,964 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 16:20:59,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 16:20:59,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,030 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-23 16:21:00,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 50 [2022-11-23 16:21:00,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,096 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-23 16:21:00,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-11-23 16:21:00,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 9 [2022-11-23 16:21:00,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:21:00,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 12 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 62 treesize of output 77 [2022-11-23 16:21:00,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,392 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-11-23 16:21:00,443 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,444 INFO L350 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 28 [2022-11-23 16:21:00,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 99 [2022-11-23 16:21:00,491 INFO L350 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 35 treesize of output 7 [2022-11-23 16:21:00,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 16:21:00,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 17 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 0 case distinctions, treesize of input 95 treesize of output 101 [2022-11-23 16:21:09,794 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 142 for LOIs [2022-11-23 16:21:09,996 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_is_valid with input of size 19 for LOIs [2022-11-23 16:21:10,646 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 135 for LOIs [2022-11-23 16:21:10,684 INFO L197 IcfgInterpreter]: Interpreting procedure nondet_uint64_t with input of size 104 for LOIs [2022-11-23 16:21:10,699 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_next_is_valid with input of size 20 for LOIs [2022-11-23 16:21:10,760 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 16:21:31,342 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17820#(and (= |#funAddr~s_can_fail_realloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (= (select |#length| 3) 12) (= 0 (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32))) (= |~#s_can_fail_allocator_static~0.base| 4) (exists ((|v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| Int)) (and (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 16) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 8) 0) (not (= |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| 2)) (not (= |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| 3)) (<= 0 |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) (= 16 (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 24))) (< |#StackHeapBarrier| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) (not (= |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| 4)) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 16) 0) (= (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 24) 0) (= 32 (select |#length| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|)) (= |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 24)) (not (= |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57| 0)) (= (select |#valid| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 1) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 8) 0) (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|) 24)) |v_ULTIMATE.start_aws_linked_list_rbegin_#in~list#1.base_BEFORE_CALL_57|))) (= |~#s_can_fail_allocator_static~0.offset| 0) (= |#funAddr~s_can_fail_malloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (<= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.offset|) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 32)) 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (<= ~tl_last_error~0 0) (= (select |#valid| 4) 1) (= |#funAddr~s_can_fail_calloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 1) 1) (= |#funAddr~s_can_fail_realloc_allocator.base| (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 16))) (<= 0 ~tl_last_error~0) (= |#funAddr~s_can_fail_calloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 24))) (= (select |#valid| 0) 0) (= (select (select |#memory_$Pointer$.base| |~#s_can_fail_allocator_static~0.base|) (+ |~#s_can_fail_allocator_static~0.offset| 8)) |#funAddr~s_can_fail_free_allocator.base|) (= |#funAddr~s_can_fail_malloc_allocator.offset| (select (select |#memory_$Pointer$.offset| |~#s_can_fail_allocator_static~0.base|) |~#s_can_fail_allocator_static~0.offset|)) (= (select |#valid| 2) 1) (= (select (select |#memory_int| 1) 0) 48) (= 40 (select |#length| 4)) (= 33 (select |#length| 2)) (<= 0 |#NULL.offset|) (= (select (select |#memory_int| 1) 1) 0) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-23 16:21:31,342 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 16:21:31,342 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 16:21:31,342 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 13] total 35 [2022-11-23 16:21:31,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871379270] [2022-11-23 16:21:31,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 16:21:31,343 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-23 16:21:31,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 16:21:31,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-23 16:21:31,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=3516, Unknown=7, NotChecked=0, Total=3906 [2022-11-23 16:21:31,345 INFO L87 Difference]: Start difference. First operand 349 states and 408 transitions. Second operand has 35 states, 33 states have (on average 2.757575757575758) internal successors, (91), 34 states have internal predecessors, (91), 17 states have call successors, (31), 4 states have call predecessors, (31), 8 states have return successors, (30), 15 states have call predecessors, (30), 16 states have call successors, (30) [2022-11-23 16:21:51,640 WARN L233 SmtUtils]: Spent 20.08s on a formula simplification. DAG size of input: 45 DAG size of output: 36 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:22:01,743 WARN L233 SmtUtils]: Spent 10.03s on a formula simplification that was a NOOP. DAG size: 37 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:22:11,843 WARN L233 SmtUtils]: Spent 10.04s on a formula simplification that was a NOOP. DAG size: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 16:22:21,944 WARN L233 SmtUtils]: Spent 10.05s on a formula simplification that was a NOOP. DAG size: 45 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)