./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur --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 39617118f1cddf1edf0da2bed0d1b7ba56db146c1be6da9375c591252f5b5d55 --- 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-38b53e6 [2022-11-26 00:27:37,994 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-26 00:27:37,997 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-26 00:27:38,037 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-26 00:27:38,038 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-26 00:27:38,041 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-26 00:27:38,044 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-26 00:27:38,047 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-26 00:27:38,051 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-26 00:27:38,057 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-26 00:27:38,058 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-26 00:27:38,059 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-26 00:27:38,059 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-26 00:27:38,060 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-26 00:27:38,061 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-26 00:27:38,062 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-26 00:27:38,063 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-26 00:27:38,064 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-26 00:27:38,065 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-26 00:27:38,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-26 00:27:38,073 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-26 00:27:38,076 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-26 00:27:38,077 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-26 00:27:38,078 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-26 00:27:38,092 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-26 00:27:38,092 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-26 00:27:38,093 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-26 00:27:38,095 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-26 00:27:38,095 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-26 00:27:38,096 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-26 00:27:38,096 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-26 00:27:38,098 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-26 00:27:38,100 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-26 00:27:38,101 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-26 00:27:38,102 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-26 00:27:38,102 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-26 00:27:38,103 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-26 00:27:38,103 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-26 00:27:38,105 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-26 00:27:38,107 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-26 00:27:38,108 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-26 00:27:38,109 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-11-26 00:27:38,150 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-26 00:27:38,151 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-26 00:27:38,151 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-26 00:27:38,152 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-26 00:27:38,154 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-26 00:27:38,154 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-26 00:27:38,154 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-26 00:27:38,155 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-26 00:27:38,155 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-26 00:27:38,155 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-26 00:27:38,156 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-26 00:27:38,157 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-26 00:27:38,157 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-26 00:27:38,157 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-26 00:27:38,157 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-26 00:27:38,158 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-26 00:27:38,158 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-26 00:27:38,158 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-26 00:27:38,159 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-26 00:27:38,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-26 00:27:38,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-26 00:27:38,160 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-26 00:27:38,160 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-26 00:27:38,161 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-26 00:27:38,161 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-26 00:27:38,161 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-26 00:27:38,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-26 00:27:38,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-26 00:27:38,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-26 00:27:38,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:27:38,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-26 00:27:38,163 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-26 00:27:38,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-26 00:27:38,164 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-26 00:27:38,164 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-26 00:27:38,164 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-26 00:27:38,164 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-26 00:27:38,165 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-26 00:27:38,165 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_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39617118f1cddf1edf0da2bed0d1b7ba56db146c1be6da9375c591252f5b5d55 [2022-11-26 00:27:38,479 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-26 00:27:38,506 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-26 00:27:38,509 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-26 00:27:38,510 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-26 00:27:38,511 INFO L275 PluginConnector]: CDTParser initialized [2022-11-26 00:27:38,512 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2022-11-26 00:27:41,585 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-26 00:27:42,176 INFO L351 CDTParser]: Found 1 translation units. [2022-11-26 00:27:42,177 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2022-11-26 00:27:42,211 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/data/78d9fa7b0/6b09fa17db5845bc83d7880228401b60/FLAG4da47b9fc [2022-11-26 00:27:42,225 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/data/78d9fa7b0/6b09fa17db5845bc83d7880228401b60 [2022-11-26 00:27:42,228 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-26 00:27:42,229 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-26 00:27:42,231 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-26 00:27:42,231 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-26 00:27:42,235 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-26 00:27:42,235 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:27:42" (1/1) ... [2022-11-26 00:27:42,236 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32f87d1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:42, skipping insertion in model container [2022-11-26 00:27:42,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 12:27:42" (1/1) ... [2022-11-26 00:27:42,245 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-26 00:27:42,341 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-26 00:27:42,613 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_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2022-11-26 00:27:42,624 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_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2022-11-26 00:27:43,546 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,547 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,547 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,548 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,550 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,582 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,583 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,585 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,586 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,588 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,589 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,590 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,597 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:43,700 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:43,701 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:43,711 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:43,716 WARN L623 FunctionHandler]: Unknown extern function ntohl [2022-11-26 00:27:43,719 WARN L623 FunctionHandler]: Unknown extern function htons [2022-11-26 00:27:43,720 WARN L623 FunctionHandler]: Unknown extern function ntohs [2022-11-26 00:27:44,061 WARN L623 FunctionHandler]: Unknown extern function my_abort [2022-11-26 00:27:44,063 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-11-26 00:27:44,064 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-11-26 00:27:44,066 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-11-26 00:27:44,067 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-11-26 00:27:44,069 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-11-26 00:27:44,074 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-11-26 00:27:44,075 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-11-26 00:27:44,076 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-11-26 00:27:44,077 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-11-26 00:27:44,079 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-11-26 00:27:44,361 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-11-26 00:27:44,413 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:27:44,440 INFO L203 MainTranslator]: Completed pre-run [2022-11-26 00:27:44,466 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_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2022-11-26 00:27:44,467 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_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2022-11-26 00:27:44,509 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,509 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,510 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,511 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,511 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,519 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,520 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,521 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,521 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,523 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,523 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,524 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,524 WARN L1576 CHandler]: Possible shadowing of function index [2022-11-26 00:27:44,532 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:44,533 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:44,533 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-11-26 00:27:44,537 WARN L623 FunctionHandler]: Unknown extern function ntohl [2022-11-26 00:27:44,539 WARN L623 FunctionHandler]: Unknown extern function htons [2022-11-26 00:27:44,539 WARN L623 FunctionHandler]: Unknown extern function ntohs [2022-11-26 00:27:44,564 WARN L623 FunctionHandler]: Unknown extern function my_abort [2022-11-26 00:27:44,565 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-11-26 00:27:44,566 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-11-26 00:27:44,567 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-11-26 00:27:44,568 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-11-26 00:27:44,569 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-11-26 00:27:44,570 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-11-26 00:27:44,570 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-11-26 00:27:44,571 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-11-26 00:27:44,571 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-11-26 00:27:44,618 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-11-26 00:27:44,643 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-11-26 00:27:44,657 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-26 00:27:44,892 INFO L208 MainTranslator]: Completed translation [2022-11-26 00:27:44,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44 WrapperNode [2022-11-26 00:27:44,894 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-26 00:27:44,895 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-26 00:27:44,895 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-26 00:27:44,895 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-26 00:27:44,903 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:44,992 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,033 INFO L138 Inliner]: procedures = 679, calls = 1031, calls flagged for inlining = 48, calls inlined = 3, statements flattened = 28 [2022-11-26 00:27:45,034 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-26 00:27:45,034 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-26 00:27:45,034 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-26 00:27:45,034 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-26 00:27:45,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,047 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,047 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,057 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,061 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,064 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,066 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,070 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-26 00:27:45,071 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-26 00:27:45,071 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-26 00:27:45,071 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-26 00:27:45,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (1/1) ... [2022-11-26 00:27:45,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-26 00:27:45,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:27:45,122 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-26 00:27:45,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-26 00:27:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_reset [2022-11-26 00:27:45,214 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_reset [2022-11-26 00:27:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_mem_zeroed [2022-11-26 00:27:45,214 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_mem_zeroed [2022-11-26 00:27:45,214 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-26 00:27:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-26 00:27:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-26 00:27:45,215 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-26 00:27:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-26 00:27:45,215 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-26 00:27:45,216 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-26 00:27:45,216 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2022-11-26 00:27:45,216 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2022-11-26 00:27:45,216 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-11-26 00:27:45,217 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-11-26 00:27:45,217 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-26 00:27:45,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-26 00:27:45,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-26 00:27:45,482 INFO L235 CfgBuilder]: Building ICFG [2022-11-26 00:27:45,484 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-26 00:27:45,668 INFO L276 CfgBuilder]: Performing block encoding [2022-11-26 00:27:45,712 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-26 00:27:45,712 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-26 00:27:45,731 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:27:45 BoogieIcfgContainer [2022-11-26 00:27:45,731 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-26 00:27:45,734 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-26 00:27:45,734 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-26 00:27:45,737 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-26 00:27:45,737 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 12:27:42" (1/3) ... [2022-11-26 00:27:45,738 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41331731 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:27:45, skipping insertion in model container [2022-11-26 00:27:45,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 12:27:44" (2/3) ... [2022-11-26 00:27:45,739 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41331731 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 12:27:45, skipping insertion in model container [2022-11-26 00:27:45,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 12:27:45" (3/3) ... [2022-11-26 00:27:45,740 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_node_reset_harness.i [2022-11-26 00:27:45,769 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-26 00:27:45,769 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-26 00:27:45,818 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-26 00:27:45,825 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;@2900c94f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-26 00:27:45,825 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-26 00:27:45,829 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-11-26 00:27:45,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-26 00:27:45,837 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:27:45,838 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:27:45,839 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:27:45,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:27:45,844 INFO L85 PathProgramCache]: Analyzing trace with hash 325938203, now seen corresponding path program 1 times [2022-11-26 00:27:45,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:27:45,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902031580] [2022-11-26 00:27:45,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:45,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:27:45,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:46,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:46,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:27:46,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902031580] [2022-11-26 00:27:46,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902031580] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:27:46,147 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:27:46,147 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-26 00:27:46,148 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184920902] [2022-11-26 00:27:46,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:27:46,153 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-11-26 00:27:46,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:27:46,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-11-26 00:27:46,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:27:46,186 INFO L87 Difference]: Start difference. First operand has 31 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:27:46,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:27:46,252 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2022-11-26 00:27:46,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-11-26 00:27:46,254 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2022-11-26 00:27:46,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:27:46,262 INFO L225 Difference]: With dead ends: 56 [2022-11-26 00:27:46,263 INFO L226 Difference]: Without dead ends: 29 [2022-11-26 00:27:46,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-11-26 00:27:46,285 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:27:46,286 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:27:46,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-26 00:27:46,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-26 00:27:46,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-26 00:27:46,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-11-26 00:27:46,339 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2022-11-26 00:27:46,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:27:46,340 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-11-26 00:27:46,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.0) internal successors, (10), 2 states have internal predecessors, (10), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-26 00:27:46,340 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-11-26 00:27:46,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-26 00:27:46,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:27:46,343 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:27:46,343 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-26 00:27:46,350 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:27:46,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:27:46,351 INFO L85 PathProgramCache]: Analyzing trace with hash -805366998, now seen corresponding path program 1 times [2022-11-26 00:27:46,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:27:46,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251892456] [2022-11-26 00:27:46,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:46,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:27:46,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:46,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:46,738 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:27:46,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251892456] [2022-11-26 00:27:46,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251892456] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:27:46,739 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:27:46,739 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 00:27:46,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697537910] [2022-11-26 00:27:46,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:27:46,740 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 00:27:46,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:27:46,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 00:27:46,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:27:46,742 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-26 00:27:46,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:27:46,857 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-11-26 00:27:46,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:27:46,858 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 21 [2022-11-26 00:27:46,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:27:46,861 INFO L225 Difference]: With dead ends: 39 [2022-11-26 00:27:46,861 INFO L226 Difference]: Without dead ends: 37 [2022-11-26 00:27:46,864 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-26 00:27:46,867 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 5 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:27:46,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:27:46,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-26 00:27:46,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2022-11-26 00:27:46,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 8 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-26 00:27:46,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-11-26 00:27:46,891 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 21 [2022-11-26 00:27:46,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:27:46,892 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-11-26 00:27:46,892 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-26 00:27:46,892 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-11-26 00:27:46,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-26 00:27:46,894 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:27:46,894 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:27:46,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-26 00:27:46,895 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:27:46,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:27:46,898 INFO L85 PathProgramCache]: Analyzing trace with hash 989415369, now seen corresponding path program 1 times [2022-11-26 00:27:46,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:27:46,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148295317] [2022-11-26 00:27:46,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:46,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:27:47,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:47,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:47,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:27:47,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148295317] [2022-11-26 00:27:47,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148295317] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:27:47,247 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:27:47,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-26 00:27:47,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398784386] [2022-11-26 00:27:47,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:27:47,248 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-26 00:27:47,248 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:27:47,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-26 00:27:47,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-26 00:27:47,254 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-26 00:27:47,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:27:47,329 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2022-11-26 00:27:47,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-26 00:27:47,330 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2022-11-26 00:27:47,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:27:47,332 INFO L225 Difference]: With dead ends: 64 [2022-11-26 00:27:47,332 INFO L226 Difference]: Without dead ends: 37 [2022-11-26 00:27:47,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-26 00:27:47,333 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 1 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-26 00:27:47,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 76 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-26 00:27:47,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-11-26 00:27:47,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-11-26 00:27:47,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 8 states have call successors, (8), 6 states have call predecessors, (8), 7 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-26 00:27:47,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2022-11-26 00:27:47,349 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 22 [2022-11-26 00:27:47,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:27:47,350 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2022-11-26 00:27:47,350 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.666666666666667) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-26 00:27:47,350 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2022-11-26 00:27:47,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-26 00:27:47,352 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:27:47,352 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:27:47,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-26 00:27:47,357 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:27:47,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:27:47,360 INFO L85 PathProgramCache]: Analyzing trace with hash -518460441, now seen corresponding path program 1 times [2022-11-26 00:27:47,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:27:47,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709387451] [2022-11-26 00:27:47,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:47,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:27:47,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:47,760 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:47,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:27:47,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709387451] [2022-11-26 00:27:47,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709387451] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:27:47,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926066995] [2022-11-26 00:27:47,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:47,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:27:47,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:27:47,775 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:27:47,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-26 00:27:48,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:48,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 30 conjunts are in the unsatisfiable core [2022-11-26 00:27:48,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:27:48,123 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:27:48,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:48,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:27:49,037 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 14 treesize of output 12 [2022-11-26 00:27:49,044 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 22 treesize of output 20 [2022-11-26 00:27:49,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:49,103 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926066995] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:27:49,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696790279] [2022-11-26 00:27:49,130 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:27:49,130 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:27:49,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:27:49,143 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:27:49,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:27:49,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:49,288 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:27:49,288 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 [2022-11-26 00:27:49,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:49,324 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 [2022-11-26 00:27:49,381 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:27:49,754 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:27:49,760 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:27:49,766 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:27:49,771 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:27:49,829 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:27:49,830 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 1 case distinctions, treesize of input 53 treesize of output 56 [2022-11-26 00:27:49,859 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:27:49,860 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 1 case distinctions, treesize of input 47 treesize of output 50 [2022-11-26 00:27:49,904 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:27:49,904 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:27:49,937 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:49,959 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:49,966 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:27:49,973 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:49,980 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:50,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,355 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:50,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:50,574 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2022-11-26 00:27:50,634 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:27:50,659 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:27:50,692 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-11-26 00:27:51,228 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:51,237 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:51,259 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:27:51,269 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:51,288 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:27:56,017 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '575#(and (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (exists ((|v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| Int)) (and (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| 2)) (not (= (mod (ite (= (ite (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| 0)) 1 0) 0) 0 1) 256) 0)) (= 16 (select |#length| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7|)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| 4)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| 0)) (not (= (mod (select (select |#memory_int| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7|) 0) 256) 0)) (= (select |#valid| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7|) 1) (<= 0 |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7|) (< |#StackHeapBarrier| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7|) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_7| 3)))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:27:56,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:27:56,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:27:56,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 8] total 17 [2022-11-26 00:27:56,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422763011] [2022-11-26 00:27:56,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:27:56,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-11-26 00:27:56,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:27:56,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-11-26 00:27:56,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1017, Unknown=0, NotChecked=0, Total=1122 [2022-11-26 00:27:56,021 INFO L87 Difference]: Start difference. First operand 37 states and 42 transitions. Second operand has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:27:56,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:27:56,532 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2022-11-26 00:27:56,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-26 00:27:56,534 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 23 [2022-11-26 00:27:56,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:27:56,537 INFO L225 Difference]: With dead ends: 71 [2022-11-26 00:27:56,538 INFO L226 Difference]: Without dead ends: 44 [2022-11-26 00:27:56,539 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=138, Invalid=1344, Unknown=0, NotChecked=0, Total=1482 [2022-11-26 00:27:56,541 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 29 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:27:56,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 159 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-26 00:27:56,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-26 00:27:56,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-26 00:27:56,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:27:56,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2022-11-26 00:27:56,560 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 23 [2022-11-26 00:27:56,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:27:56,560 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2022-11-26 00:27:56,560 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:27:56,560 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2022-11-26 00:27:56,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-26 00:27:56,561 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:27:56,561 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:27:56,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-26 00:27:56,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:27:56,771 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:27:56,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:27:56,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1249058711, now seen corresponding path program 1 times [2022-11-26 00:27:56,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:27:56,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1064805931] [2022-11-26 00:27:56,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:56,772 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:27:56,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:57,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-26 00:27:57,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:27:57,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1064805931] [2022-11-26 00:27:57,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1064805931] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:27:57,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947370831] [2022-11-26 00:27:57,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:27:57,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:27:57,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:27:57,067 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:27:57,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-26 00:27:57,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:27:57,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 42 conjunts are in the unsatisfiable core [2022-11-26 00:27:57,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:27:57,248 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:57,266 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 21 treesize of output 20 [2022-11-26 00:27:57,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:57,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:27:58,347 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 22 treesize of output 20 [2022-11-26 00:27:58,351 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 54 treesize of output 50 [2022-11-26 00:27:58,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:27:58,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947370831] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:27:58,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1652605874] [2022-11-26 00:27:58,399 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:27:58,399 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:27:58,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:27:58,400 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:27:58,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:27:58,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:58,462 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-26 00:27:58,463 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 [2022-11-26 00:27:58,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:58,532 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:27:58,533 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 [2022-11-26 00:27:58,562 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:27:58,812 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:27:58,821 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,826 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,835 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,854 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,862 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 66 treesize of output 65 [2022-11-26 00:27:58,872 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 64 treesize of output 63 [2022-11-26 00:27:58,881 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 64 treesize of output 63 [2022-11-26 00:27:58,908 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,914 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,919 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:27:58,925 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:27:59,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,139 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:27:59,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 461 treesize of output 405 [2022-11-26 00:27:59,560 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 405 treesize of output 389 [2022-11-26 00:27:59,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,817 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:27:59,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:27:59,885 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:28:00,114 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:28:00,137 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:28:00,309 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:28:00,766 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:00,773 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:00,781 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:00,790 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:00,803 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:28:15,288 WARN L233 SmtUtils]: Spent 6.41s on a formula simplification. DAG size of input: 123 DAG size of output: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:28:17,922 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '934#(and (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_4 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_4 Int)) (and (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_4) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_4 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67 18446744073709551616))))) 256) 0)) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67 18446744073709551614) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_4_67))) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 Int)) (and (= (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23) 16) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 0)) (not (= (mod (ite (= 0 (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 0)) 1 0)) 0 1) 256) 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 4)) (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23) 1) (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 3)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_23 2)))) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:28:17,923 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:28:17,923 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:28:17,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 10] total 22 [2022-11-26 00:28:17,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644947865] [2022-11-26 00:28:17,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:28:17,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-26 00:28:17,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:28:17,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-26 00:28:17,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1441, Unknown=3, NotChecked=0, Total=1560 [2022-11-26 00:28:17,926 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:28:19,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:28:19,065 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2022-11-26 00:28:19,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-26 00:28:19,066 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 26 [2022-11-26 00:28:19,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:28:19,067 INFO L225 Difference]: With dead ends: 82 [2022-11-26 00:28:19,068 INFO L226 Difference]: Without dead ends: 51 [2022-11-26 00:28:19,069 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=174, Invalid=1985, Unknown=3, NotChecked=0, Total=2162 [2022-11-26 00:28:19,070 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 28 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 320 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-26 00:28:19,070 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 222 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-26 00:28:19,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-11-26 00:28:19,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2022-11-26 00:28:19,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 31 states have internal predecessors, (36), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:28:19,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-11-26 00:28:19,081 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 26 [2022-11-26 00:28:19,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:28:19,081 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-11-26 00:28:19,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:28:19,082 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-11-26 00:28:19,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-26 00:28:19,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:28:19,083 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:28:19,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-26 00:28:19,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:19,307 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:28:19,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:28:19,308 INFO L85 PathProgramCache]: Analyzing trace with hash -842842685, now seen corresponding path program 2 times [2022-11-26 00:28:19,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:28:19,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115063987] [2022-11-26 00:28:19,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:28:19,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:28:19,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:28:19,707 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 00:28:19,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:28:19,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115063987] [2022-11-26 00:28:19,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115063987] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:28:19,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607326027] [2022-11-26 00:28:19,708 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:28:19,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:19,708 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:28:19,710 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:28:19,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-26 00:28:19,946 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-26 00:28:19,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:28:19,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-26 00:28:19,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:28:20,025 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:28:20,058 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 23 treesize of output 22 [2022-11-26 00:28:20,137 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 00:28:20,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:28:20,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607326027] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:28:20,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [636042432] [2022-11-26 00:28:20,410 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:28:20,410 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:28:20,411 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:28:20,411 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:28:20,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:28:20,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:20,494 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:28:20,494 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 [2022-11-26 00:28:20,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:20,515 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 [2022-11-26 00:28:20,541 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:28:20,702 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:28:20,706 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:28:20,712 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:28:20,718 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:28:20,760 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:28:20,761 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 1 case distinctions, treesize of input 51 treesize of output 54 [2022-11-26 00:28:20,792 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:28:20,793 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 1 case distinctions, treesize of input 49 treesize of output 52 [2022-11-26 00:28:20,824 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:28:20,824 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:28:20,859 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:20,882 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:20,891 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:20,912 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:20,921 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:21,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,121 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,256 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:28:21,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 461 treesize of output 445 [2022-11-26 00:28:21,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 445 treesize of output 389 [2022-11-26 00:28:21,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,742 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:21,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:21,808 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:28:22,033 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:28:22,055 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 68 for LOIs [2022-11-26 00:28:22,208 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:28:22,638 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:22,648 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:22,663 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:22,672 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:22,686 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:28:36,850 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1262#(and (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_5 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_5 Int)) (and (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_5) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_5 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67 18446744073709551616))))) 256) 0)) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_5_67 18446744073709551614))) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 Int)) (and (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 2)) (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 3)) (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33) 1) (not (= (mod (ite (= (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 0)) 1 0) 0) 0 1) 256) 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33 4)) (= 16 (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_33)))) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:28:36,850 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:28:36,850 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:28:36,851 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 14 [2022-11-26 00:28:36,851 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507600104] [2022-11-26 00:28:36,851 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:28:36,851 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-26 00:28:36,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:28:36,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-26 00:28:36,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=968, Unknown=2, NotChecked=0, Total=1056 [2022-11-26 00:28:36,853 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 14 states, 10 states have (on average 2.9) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:28:37,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:28:37,381 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2022-11-26 00:28:37,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-26 00:28:37,385 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 2.9) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 29 [2022-11-26 00:28:37,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:28:37,386 INFO L225 Difference]: With dead ends: 79 [2022-11-26 00:28:37,387 INFO L226 Difference]: Without dead ends: 46 [2022-11-26 00:28:37,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=110, Invalid=1220, Unknown=2, NotChecked=0, Total=1332 [2022-11-26 00:28:37,388 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:28:37,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 229 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-26 00:28:37,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-26 00:28:37,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-11-26 00:28:37,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 32 states have internal predecessors, (37), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:28:37,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2022-11-26 00:28:37,410 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 29 [2022-11-26 00:28:37,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:28:37,410 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2022-11-26 00:28:37,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 2.9) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:28:37,411 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2022-11-26 00:28:37,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-26 00:28:37,413 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:28:37,413 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:28:37,423 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-26 00:28:37,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:37,619 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:28:37,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:28:37,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1139170277, now seen corresponding path program 3 times [2022-11-26 00:28:37,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:28:37,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955827935] [2022-11-26 00:28:37,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:28:37,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:28:37,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:28:38,108 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-26 00:28:38,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:28:38,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955827935] [2022-11-26 00:28:38,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955827935] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:28:38,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671904463] [2022-11-26 00:28:38,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:28:38,109 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:38,109 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:28:38,113 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:28:38,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-26 00:28:38,312 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:28:38,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:28:38,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-26 00:28:38,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:28:38,327 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:28:38,361 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-11-26 00:28:38,361 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 1 case distinctions, treesize of input 22 treesize of output 21 [2022-11-26 00:28:38,400 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:28:38,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 30 treesize of output 32 [2022-11-26 00:28:38,443 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:28:38,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 39 treesize of output 44 [2022-11-26 00:28:39,060 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:28:39,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:28:40,151 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 34 treesize of output 32 [2022-11-26 00:28:40,156 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 242 treesize of output 238 [2022-11-26 00:28:40,272 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:28:40,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671904463] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:28:40,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [878710468] [2022-11-26 00:28:40,275 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:28:40,275 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:28:40,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:28:40,276 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:28:40,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:28:40,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,352 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-26 00:28:40,352 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 [2022-11-26 00:28:40,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,422 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:28:40,422 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 [2022-11-26 00:28:40,453 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:28:40,609 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,614 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,620 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:40,626 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,644 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 64 treesize of output 63 [2022-11-26 00:28:40,656 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 66 treesize of output 65 [2022-11-26 00:28:40,665 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 64 treesize of output 63 [2022-11-26 00:28:40,678 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,691 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:40,696 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,702 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,709 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:40,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,872 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:40,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:40,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:41,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,019 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:41,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:41,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:28:41,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 461 treesize of output 405 [2022-11-26 00:28:41,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 405 treesize of output 389 [2022-11-26 00:28:41,454 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:41,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:28:41,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:28:41,519 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:28:41,712 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:28:41,736 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:28:41,892 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:28:42,281 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:42,287 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:42,301 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:42,309 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:28:42,317 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:28:53,428 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1673#(and (= (select |#length| 3) 12) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_8 Int) (v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_8 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67 Int)) (and (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67 18446744073709551614) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67) (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_8) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_8 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_8_67 18446744073709551616))))) 256) 0)))) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 Int)) (and (= (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46) 16) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 4)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 0)) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46) (not (= (mod (ite (= (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 0)) 1 0) 0) 0 1) 256) 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 2)) (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46) 1) (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_46 3)))) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:28:53,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:28:53,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:28:53,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14, 13] total 30 [2022-11-26 00:28:53,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940627892] [2022-11-26 00:28:53,429 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:28:53,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-26 00:28:53,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:28:53,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-26 00:28:53,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2099, Unknown=1, NotChecked=0, Total=2256 [2022-11-26 00:28:53,432 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:28:54,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:28:54,859 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-11-26 00:28:54,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-26 00:28:54,862 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 30 [2022-11-26 00:28:54,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:28:54,863 INFO L225 Difference]: With dead ends: 88 [2022-11-26 00:28:54,863 INFO L226 Difference]: Without dead ends: 55 [2022-11-26 00:28:54,865 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=217, Invalid=2752, Unknown=1, NotChecked=0, Total=2970 [2022-11-26 00:28:54,866 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 34 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 527 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 527 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-26 00:28:54,866 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 332 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 527 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-26 00:28:54,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-26 00:28:54,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2022-11-26 00:28:54,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.3125) internal successors, (42), 35 states have internal predecessors, (42), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:28:54,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2022-11-26 00:28:54,878 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 30 [2022-11-26 00:28:54,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:28:54,879 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2022-11-26 00:28:54,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.7241379310344827) internal successors, (50), 29 states have internal predecessors, (50), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:28:54,879 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2022-11-26 00:28:54,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-26 00:28:54,880 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:28:54,880 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:28:54,894 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-26 00:28:55,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:55,088 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:28:55,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:28:55,089 INFO L85 PathProgramCache]: Analyzing trace with hash -197615727, now seen corresponding path program 4 times [2022-11-26 00:28:55,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:28:55,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394598347] [2022-11-26 00:28:55,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:28:55,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:28:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:28:55,619 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-26 00:28:55,619 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:28:55,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394598347] [2022-11-26 00:28:55,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394598347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:28:55,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504330353] [2022-11-26 00:28:55,620 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:28:55,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:28:55,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:28:55,622 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:28:55,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-26 00:28:55,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:28:55,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-26 00:28:55,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:28:55,914 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:28:55,943 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 25 treesize of output 24 [2022-11-26 00:28:55,990 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:28:55,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 30 treesize of output 32 [2022-11-26 00:28:56,069 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-11-26 00:28:56,069 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 45 [2022-11-26 00:28:56,118 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:28:56,118 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 48 treesize of output 56 [2022-11-26 00:28:57,285 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:28:57,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:28:59,989 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 82 treesize of output 78 [2022-11-26 00:28:59,998 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:28:59,999 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 1024 treesize of output 1016 [2022-11-26 00:29:00,159 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:29:00,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504330353] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:29:00,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [631433240] [2022-11-26 00:29:00,162 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:29:00,162 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:29:00,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:29:00,163 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:29:00,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:29:00,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,236 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:29:00,236 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 [2022-11-26 00:29:00,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,252 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 [2022-11-26 00:29:00,275 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:29:00,403 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:00,409 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:00,413 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:29:00,419 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:00,454 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:29:00,454 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 1 case distinctions, treesize of input 53 treesize of output 56 [2022-11-26 00:29:00,480 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:29:00,481 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 1 case distinctions, treesize of input 47 treesize of output 50 [2022-11-26 00:29:00,501 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:29:00,502 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:29:00,535 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:00,550 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:29:00,555 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:00,561 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:00,566 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:00,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:00,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:00,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:00,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:00,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:01,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:29:01,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 461 treesize of output 405 [2022-11-26 00:29:01,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 405 treesize of output 389 [2022-11-26 00:29:01,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:01,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:01,282 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:01,320 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:29:01,468 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:29:01,490 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:29:01,611 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-11-26 00:29:02,023 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:02,031 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:02,043 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:02,050 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:29:02,062 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:29:16,980 WARN L233 SmtUtils]: Spent 6.87s on a formula simplification. DAG size of input: 183 DAG size of output: 134 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:29:28,115 WARN L233 SmtUtils]: Spent 6.36s on a formula simplification. DAG size of input: 125 DAG size of output: 95 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:29:28,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2130#(and (exists ((v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_9 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_9 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67 Int)) (and (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_9) (+ (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67 18446744073709551616))) v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_9)) 256) 0)) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_9_67 18446744073709551614))) (= (select |#length| 3) 12) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 Int)) (and (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 2)) (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59) 1) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 4)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 3)) (not (= (mod (ite (= (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59 0)) 1 0) 0) 0 1) 256) 0)) (= (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_59) 16))) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (<= |#NULL.offset| 0) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (<= ~tl_last_error~0 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (<= 0 ~tl_last_error~0) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= 40 (select |#length| 4)) (<= 0 |#NULL.offset|) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:29:28,117 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:29:28,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:29:28,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 17, 16] total 37 [2022-11-26 00:29:28,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235175122] [2022-11-26 00:29:28,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:29:28,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-26 00:29:28,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:29:28,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-26 00:29:28,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=2780, Unknown=1, NotChecked=0, Total=2970 [2022-11-26 00:29:28,120 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:29:33,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:29:33,168 INFO L93 Difference]: Finished difference Result 97 states and 124 transitions. [2022-11-26 00:29:33,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-11-26 00:29:33,169 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 33 [2022-11-26 00:29:33,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:29:33,170 INFO L225 Difference]: With dead ends: 97 [2022-11-26 00:29:33,170 INFO L226 Difference]: Without dead ends: 62 [2022-11-26 00:29:33,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=265, Invalid=3640, Unknown=1, NotChecked=0, Total=3906 [2022-11-26 00:29:33,173 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 42 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 960 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 960 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:29:33,173 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 540 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 960 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-11-26 00:29:33,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-26 00:29:33,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2022-11-26 00:29:33,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 38 states have internal predecessors, (47), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:29:33,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2022-11-26 00:29:33,189 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 33 [2022-11-26 00:29:33,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:29:33,189 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2022-11-26 00:29:33,189 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 36 states have internal predecessors, (57), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:29:33,190 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2022-11-26 00:29:33,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-26 00:29:33,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:29:33,191 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:29:33,199 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-26 00:29:33,398 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-26 00:29:33,398 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:29:33,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:29:33,399 INFO L85 PathProgramCache]: Analyzing trace with hash 700550721, now seen corresponding path program 5 times [2022-11-26 00:29:33,399 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:29:33,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722514967] [2022-11-26 00:29:33,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:29:33,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:29:33,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:29:33,980 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:29:33,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:29:33,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722514967] [2022-11-26 00:29:33,981 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [722514967] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:29:33,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213716210] [2022-11-26 00:29:33,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:29:33,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:29:33,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:29:33,983 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:29:34,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-26 00:29:34,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-26 00:29:34,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:29:34,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 89 conjunts are in the unsatisfiable core [2022-11-26 00:29:34,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:29:34,369 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:34,410 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 25 treesize of output 24 [2022-11-26 00:29:34,453 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:34,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 30 treesize of output 32 [2022-11-26 00:29:34,524 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-11-26 00:29:34,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 45 [2022-11-26 00:29:34,575 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:34,576 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 48 treesize of output 56 [2022-11-26 00:29:34,674 INFO L321 Elim1Store]: treesize reduction 88, result has 33.3 percent of original size [2022-11-26 00:29:34,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 58 treesize of output 69 [2022-11-26 00:29:34,802 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:29:34,803 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:29:35,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213716210] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:29:35,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419153848] [2022-11-26 00:29:35,160 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:29:35,160 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:29:35,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:29:35,161 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:29:35,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:29:35,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,244 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:29:35,245 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 [2022-11-26 00:29:35,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,260 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 [2022-11-26 00:29:35,283 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:29:35,418 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:35,421 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:35,425 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:29:35,430 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:29:35,442 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:35,474 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:29:35,474 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 1 case distinctions, treesize of input 51 treesize of output 54 [2022-11-26 00:29:35,502 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:29:35,502 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 1 case distinctions, treesize of input 49 treesize of output 52 [2022-11-26 00:29:35,528 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:29:35,528 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:29:35,552 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:35,557 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:35,562 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:29:35,568 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:35,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,726 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:35,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:35,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,865 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:35,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:35,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:36,051 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:29:36,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 461 treesize of output 445 [2022-11-26 00:29:36,089 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 445 treesize of output 389 [2022-11-26 00:29:36,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:36,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:29:36,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:29:36,343 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:29:36,516 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:29:36,547 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:29:36,645 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:29:36,980 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:36,989 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:29:36,996 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:37,004 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:37,010 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:29:46,909 WARN L233 SmtUtils]: Spent 5.19s on a formula simplification. DAG size of input: 183 DAG size of output: 128 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:29:56,644 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2521#(and (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (exists ((aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68 Int) (v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_11 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_11 Int)) (and (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68 18446744073709551614) (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_11) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_11 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_11_68 18446744073709551616))))) 256) 0)))) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 Int)) (and (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69) 1) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69) (not (= (mod (ite (= (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 0)) 1 0) 0) 0 1) 256) 0)) (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 2)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 3)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69 4)) (= (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_69) 16))) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:29:56,644 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:29:56,644 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:29:56,644 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 20 [2022-11-26 00:29:56,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044321652] [2022-11-26 00:29:56,644 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:29:56,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-26 00:29:56,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:29:56,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-26 00:29:56,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1614, Unknown=2, NotChecked=0, Total=1722 [2022-11-26 00:29:56,646 INFO L87 Difference]: Start difference. First operand 52 states and 65 transitions. Second operand has 20 states, 16 states have (on average 2.1875) internal successors, (35), 19 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:29:57,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:29:57,691 INFO L93 Difference]: Finished difference Result 90 states and 116 transitions. [2022-11-26 00:29:57,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-26 00:29:57,693 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 16 states have (on average 2.1875) internal successors, (35), 19 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 36 [2022-11-26 00:29:57,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:29:57,694 INFO L225 Difference]: With dead ends: 90 [2022-11-26 00:29:57,695 INFO L226 Difference]: Without dead ends: 53 [2022-11-26 00:29:57,696 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=150, Invalid=2298, Unknown=2, NotChecked=0, Total=2450 [2022-11-26 00:29:57,698 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 291 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 363 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-26 00:29:57,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 315 Invalid, 363 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-26 00:29:57,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-26 00:29:57,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-11-26 00:29:57,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 39 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:29:57,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 66 transitions. [2022-11-26 00:29:57,711 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 66 transitions. Word has length 36 [2022-11-26 00:29:57,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:29:57,712 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 66 transitions. [2022-11-26 00:29:57,712 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 16 states have (on average 2.1875) internal successors, (35), 19 states have internal predecessors, (35), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:29:57,712 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 66 transitions. [2022-11-26 00:29:57,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-11-26 00:29:57,713 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:29:57,713 INFO L195 NwaCegarLoop]: trace histogram [7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:29:57,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-26 00:29:57,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-26 00:29:57,919 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:29:57,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:29:57,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1164486111, now seen corresponding path program 6 times [2022-11-26 00:29:57,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:29:57,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889638849] [2022-11-26 00:29:57,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:29:57,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:29:57,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:29:58,503 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-26 00:29:58,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:29:58,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889638849] [2022-11-26 00:29:58,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889638849] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:29:58,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199540252] [2022-11-26 00:29:58,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:29:58,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:29:58,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:29:58,507 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:29:58,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-26 00:29:58,837 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:29:58,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:29:58,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-26 00:29:58,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:29:58,912 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:29:58,950 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 25 treesize of output 24 [2022-11-26 00:29:58,986 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:58,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 30 treesize of output 32 [2022-11-26 00:29:59,054 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-11-26 00:29:59,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 45 [2022-11-26 00:29:59,112 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:59,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 48 treesize of output 56 [2022-11-26 00:29:59,194 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:59,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 57 treesize of output 68 [2022-11-26 00:29:59,264 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:29:59,264 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 57 treesize of output 68 [2022-11-26 00:30:00,352 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:00,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:03,199 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 52 treesize of output 50 [2022-11-26 00:30:03,206 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 15506 treesize of output 15474 [2022-11-26 00:30:06,568 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:06,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199540252] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:06,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1060583197] [2022-11-26 00:30:06,571 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:30:06,571 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:06,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:06,572 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:06,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:06,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:06,624 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-26 00:30:06,624 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 [2022-11-26 00:30:06,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:06,682 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:30:06,682 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 [2022-11-26 00:30:06,701 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:30:06,848 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:30:06,852 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,858 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,864 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,879 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 66 treesize of output 65 [2022-11-26 00:30:06,888 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 64 treesize of output 63 [2022-11-26 00:30:06,895 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 64 treesize of output 63 [2022-11-26 00:30:06,925 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,937 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:30:06,943 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,949 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:06,954 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:07,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,129 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,146 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,251 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,267 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,425 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:30:07,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 461 treesize of output 405 [2022-11-26 00:30:07,456 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 405 treesize of output 389 [2022-11-26 00:30:07,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:07,668 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:07,709 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:30:07,896 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:30:07,917 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:30:08,063 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:30:08,392 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:30:08,405 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:08,413 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:08,421 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:08,435 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:30:22,415 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3028#(and (exists ((|v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| Int)) (and (= (select |#valid| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67|) 1) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| 0)) (= 16 (select |#length| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67|)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| 4)) (not (= (mod (ite (= (ite (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| 0)) 1 0) 0) 0 1) 256) 0)) (< |#StackHeapBarrier| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67|) (<= 0 |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67|) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| 2)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_67| 3)))) (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (exists ((aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_13 Int) (v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_13 Int)) (and (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68) (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_13) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_13 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68 18446744073709551616) (+ (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68 18446744073709551616) (- 18446744073709551616))))) 256) 0)) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_13_68 18446744073709551614))))' at error location [2022-11-26 00:30:22,415 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:30:22,416 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:30:22,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 22, 18] total 46 [2022-11-26 00:30:22,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193030979] [2022-11-26 00:30:22,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:30:22,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-26 00:30:22,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:30:22,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-26 00:30:22,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=3782, Unknown=2, NotChecked=0, Total=4032 [2022-11-26 00:30:22,419 INFO L87 Difference]: Start difference. First operand 53 states and 66 transitions. Second operand has 46 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 44 states have internal predecessors, (69), 6 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-26 00:30:27,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:30:27,825 INFO L93 Difference]: Finished difference Result 107 states and 139 transitions. [2022-11-26 00:30:27,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-11-26 00:30:27,825 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 44 states have internal predecessors, (69), 6 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 37 [2022-11-26 00:30:27,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:30:27,826 INFO L225 Difference]: With dead ends: 107 [2022-11-26 00:30:27,827 INFO L226 Difference]: Without dead ends: 70 [2022-11-26 00:30:27,828 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1241 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=362, Invalid=5336, Unknown=2, NotChecked=0, Total=5700 [2022-11-26 00:30:27,829 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 49 mSDsluCounter, 462 mSDsCounter, 0 mSdLazyCounter, 1195 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 1234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-26 00:30:27,830 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 489 Invalid, 1234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1195 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-11-26 00:30:27,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-26 00:30:27,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 56. [2022-11-26 00:30:27,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 39 states have (on average 1.358974358974359) internal successors, (53), 42 states have internal predecessors, (53), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:30:27,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2022-11-26 00:30:27,846 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 37 [2022-11-26 00:30:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:30:27,846 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2022-11-26 00:30:27,847 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 43 states have (on average 1.6046511627906976) internal successors, (69), 44 states have internal predecessors, (69), 6 states have call successors, (10), 4 states have call predecessors, (10), 6 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-26 00:30:27,847 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2022-11-26 00:30:27,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-26 00:30:27,848 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:30:27,848 INFO L195 NwaCegarLoop]: trace histogram [8, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:30:27,863 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-26 00:30:28,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:28,055 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:30:28,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:30:28,056 INFO L85 PathProgramCache]: Analyzing trace with hash -682223601, now seen corresponding path program 7 times [2022-11-26 00:30:28,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:30:28,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329051507] [2022-11-26 00:30:28,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:30:28,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:30:28,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:28,636 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-11-26 00:30:28,636 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:30:28,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329051507] [2022-11-26 00:30:28,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329051507] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:30:28,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38418978] [2022-11-26 00:30:28,636 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:30:28,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:30:28,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:30:28,638 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:30:28,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-26 00:30:29,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:30:29,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-26 00:30:29,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:30:29,032 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:30:29,055 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 21 treesize of output 20 [2022-11-26 00:30:29,097 INFO L321 Elim1Store]: treesize reduction 34, result has 33.3 percent of original size [2022-11-26 00:30:29,097 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:30:29,164 INFO L321 Elim1Store]: treesize reduction 50, result has 25.4 percent of original size [2022-11-26 00:30:29,164 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 41 treesize of output 46 [2022-11-26 00:30:29,238 INFO L321 Elim1Store]: treesize reduction 66, result has 20.5 percent of original size [2022-11-26 00:30:29,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 8 case distinctions, treesize of input 51 treesize of output 59 [2022-11-26 00:30:29,301 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:30:29,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 57 treesize of output 68 [2022-11-26 00:30:29,422 INFO L321 Elim1Store]: treesize reduction 106, result has 33.3 percent of original size [2022-11-26 00:30:29,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 80 [2022-11-26 00:30:29,542 INFO L321 Elim1Store]: treesize reduction 106, result has 33.3 percent of original size [2022-11-26 00:30:29,542 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 21 case distinctions, treesize of input 66 treesize of output 80 [2022-11-26 00:30:30,921 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 1 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:30,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:30:35,760 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 114 treesize of output 110 [2022-11-26 00:30:35,784 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:30:35,785 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 32556 treesize of output 32524 [2022-11-26 00:30:39,923 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:30:39,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38418978] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:30:39,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281618981] [2022-11-26 00:30:39,925 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:30:39,925 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:30:39,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:30:39,926 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:30:39,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:30:39,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,008 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:30:40,009 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 [2022-11-26 00:30:40,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,025 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 [2022-11-26 00:30:40,050 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:30:40,213 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:30:40,217 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 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:30:40,222 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:30:40,231 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:30:40,242 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:40,272 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:30:40,272 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 1 case distinctions, treesize of input 51 treesize of output 54 [2022-11-26 00:30:40,298 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:30:40,299 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 1 case distinctions, treesize of input 49 treesize of output 52 [2022-11-26 00:30:40,325 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:30:40,326 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:30:40,350 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:40,355 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:30:40,360 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:40,366 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:40,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,505 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:40,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:40,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:40,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,626 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,627 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:40,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:40,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:30:40,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 461 treesize of output 405 [2022-11-26 00:30:40,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 405 treesize of output 389 [2022-11-26 00:30:41,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:41,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:30:41,029 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:30:41,069 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:30:41,258 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:30:41,278 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:30:41,377 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-11-26 00:30:41,699 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:41,706 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:30:41,719 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:41,727 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:30:41,738 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:02,116 WARN L233 SmtUtils]: Spent 8.54s on a formula simplification. DAG size of input: 123 DAG size of output: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:31:02,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3588#(and (= (select |#length| 3) 12) (= |~#s_can_fail_allocator_static~0.base| 4) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_16 Int) (v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_16 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68 Int)) (and (not (= 0 (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_16) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_16 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68 18446744073709551616))))) 256))) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68 18446744073709551614) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_16_68))) (exists ((|v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| Int)) (and (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| 4)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| 2)) (= (select |#valid| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77|) 1) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| 3)) (< |#StackHeapBarrier| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77|) (= 16 (select |#length| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77|)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| 0)) (<= 0 |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77|) (not (= (mod (ite (= (ite (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_77| 0)) 1 0) 0) 0 1) 256) 0)))) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:02,750 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:02,750 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:31:02,751 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 22, 21] total 50 [2022-11-26 00:31:02,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225341875] [2022-11-26 00:31:02,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:02,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-26 00:31:02,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:02,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-26 00:31:02,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4172, Unknown=1, NotChecked=0, Total=4422 [2022-11-26 00:31:02,753 INFO L87 Difference]: Start difference. First operand 56 states and 71 transitions. Second operand has 50 states, 49 states have (on average 1.510204081632653) internal successors, (74), 49 states have internal predecessors, (74), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:31:06,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:06,092 INFO L93 Difference]: Finished difference Result 116 states and 153 transitions. [2022-11-26 00:31:06,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-26 00:31:06,093 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.510204081632653) internal successors, (74), 49 states have internal predecessors, (74), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 40 [2022-11-26 00:31:06,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:06,094 INFO L225 Difference]: With dead ends: 116 [2022-11-26 00:31:06,094 INFO L226 Difference]: Without dead ends: 77 [2022-11-26 00:31:06,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1597 ImplicationChecksByTransitivity, 25.3s TimeCoverageRelationStatistics Valid=339, Invalid=4916, Unknown=1, NotChecked=0, Total=5256 [2022-11-26 00:31:06,097 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 73 mSDsluCounter, 779 mSDsCounter, 0 mSdLazyCounter, 1602 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 809 SdHoareTripleChecker+Invalid, 1608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:06,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 809 Invalid, 1608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1602 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2022-11-26 00:31:06,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-26 00:31:06,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 59. [2022-11-26 00:31:06,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 42 states have (on average 1.380952380952381) internal successors, (58), 45 states have internal predecessors, (58), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:31:06,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 76 transitions. [2022-11-26 00:31:06,115 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 76 transitions. Word has length 40 [2022-11-26 00:31:06,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:06,115 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 76 transitions. [2022-11-26 00:31:06,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.510204081632653) internal successors, (74), 49 states have internal predecessors, (74), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:31:06,115 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 76 transitions. [2022-11-26 00:31:06,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-11-26 00:31:06,116 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:06,116 INFO L195 NwaCegarLoop]: trace histogram [9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:31:06,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:06,316 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:06,317 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:06,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:06,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2117284933, now seen corresponding path program 8 times [2022-11-26 00:31:06,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:06,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803758395] [2022-11-26 00:31:06,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:06,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:06,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:31:06,943 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-26 00:31:06,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:06,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803758395] [2022-11-26 00:31:06,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803758395] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:06,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557651188] [2022-11-26 00:31:06,943 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-26 00:31:06,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:06,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:06,947 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:06,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-26 00:31:07,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-26 00:31:07,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:07,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-26 00:31:08,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:08,084 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:08,116 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 25 treesize of output 24 [2022-11-26 00:31:08,156 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:08,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 35 treesize of output 37 [2022-11-26 00:31:08,210 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:08,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 39 treesize of output 44 [2022-11-26 00:31:08,299 INFO L321 Elim1Store]: treesize reduction 70, result has 33.3 percent of original size [2022-11-26 00:31:08,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 10 case distinctions, treesize of input 49 treesize of output 57 [2022-11-26 00:31:08,369 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:08,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 57 treesize of output 68 [2022-11-26 00:31:08,439 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:08,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 66 treesize of output 80 [2022-11-26 00:31:08,591 INFO L321 Elim1Store]: treesize reduction 124, result has 33.3 percent of original size [2022-11-26 00:31:08,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 76 treesize of output 93 [2022-11-26 00:31:08,781 INFO L321 Elim1Store]: treesize reduction 180, result has 25.6 percent of original size [2022-11-26 00:31:08,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 35 case distinctions, treesize of input 86 treesize of output 106 [2022-11-26 00:31:09,000 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-26 00:31:09,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:09,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557651188] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:09,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1768812692] [2022-11-26 00:31:09,249 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:31:09,249 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:09,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:09,251 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:09,251 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:09,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,302 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-26 00:31:09,303 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 [2022-11-26 00:31:09,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,362 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:31:09,362 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 [2022-11-26 00:31:09,382 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:31:09,495 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:31:09,498 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 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-26 00:31:09,519 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:31:09,525 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:31:09,561 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:31:09,561 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 1 case distinctions, treesize of input 51 treesize of output 54 [2022-11-26 00:31:09,591 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-11-26 00:31:09,591 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 1 case distinctions, treesize of input 49 treesize of output 52 [2022-11-26 00:31:09,617 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-26 00:31:09,617 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 1 case distinctions, treesize of input 43 treesize of output 46 [2022-11-26 00:31:09,645 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:09,657 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:31:09,662 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:09,668 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:09,673 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:09,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,809 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:09,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:09,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:09,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:09,931 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:10,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:31:10,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 461 treesize of output 445 [2022-11-26 00:31:10,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 445 treesize of output 389 [2022-11-26 00:31:10,303 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:10,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:10,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:10,353 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:31:10,495 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:31:10,511 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:31:10,636 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:31:11,004 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:11,010 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:11,017 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:11,025 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:31:11,037 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:25,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4036#(and (= (select |#length| 3) 12) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_17 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68 Int) (v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_17 Int)) (and (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68 18446744073709551614) (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_17) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_17 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68 18446744073709551616))))) 256) 0)) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_17_68))) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (exists ((|v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| Int)) (and (< |#StackHeapBarrier| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87|) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| 4)) (not (= (mod (ite (= (ite (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| 0)) 1 0) 0) 0 1) 256) 0)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| 3)) (= 16 (select |#length| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87|)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| 2)) (not (= |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87| 0)) (<= 0 |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87|) (= (select |#valid| |v_aws_linked_list_node_reset_#in~node.base_BEFORE_CALL_87|) 1))) (<= ~tl_last_error~0 0) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (<= 0 ~tl_last_error~0) (= (select |#valid| 0) 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:31:25,063 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:31:25,063 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-26 00:31:25,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16] total 26 [2022-11-26 00:31:25,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4446972] [2022-11-26 00:31:25,064 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-26 00:31:25,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-26 00:31:25,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:31:25,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-26 00:31:25,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1780, Unknown=0, NotChecked=0, Total=1892 [2022-11-26 00:31:25,066 INFO L87 Difference]: Start difference. First operand 59 states and 76 transitions. Second operand has 26 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 25 states have internal predecessors, (41), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:31:26,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:31:26,813 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2022-11-26 00:31:26,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-26 00:31:26,814 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 25 states have internal predecessors, (41), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 43 [2022-11-26 00:31:26,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:31:26,815 INFO L225 Difference]: With dead ends: 101 [2022-11-26 00:31:26,815 INFO L226 Difference]: Without dead ends: 60 [2022-11-26 00:31:26,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=171, Invalid=2799, Unknown=0, NotChecked=0, Total=2970 [2022-11-26 00:31:26,817 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 565 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 438 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 565 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-26 00:31:26,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 438 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 565 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-26 00:31:26,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-11-26 00:31:26,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-11-26 00:31:26,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 43 states have (on average 1.372093023255814) internal successors, (59), 46 states have internal predecessors, (59), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:31:26,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 77 transitions. [2022-11-26 00:31:26,841 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 77 transitions. Word has length 43 [2022-11-26 00:31:26,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:31:26,842 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 77 transitions. [2022-11-26 00:31:26,842 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 25 states have internal predecessors, (41), 4 states have call successors, (9), 3 states have call predecessors, (9), 4 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-11-26 00:31:26,842 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 77 transitions. [2022-11-26 00:31:26,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-26 00:31:26,843 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:31:26,843 INFO L195 NwaCegarLoop]: trace histogram [10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:31:26,850 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-26 00:31:27,050 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-26 00:31:27,050 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:31:27,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:31:27,051 INFO L85 PathProgramCache]: Analyzing trace with hash -1538816419, now seen corresponding path program 9 times [2022-11-26 00:31:27,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:31:27,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581695153] [2022-11-26 00:31:27,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:31:27,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:31:27,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:31:27,685 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-11-26 00:31:27,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:31:27,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581695153] [2022-11-26 00:31:27,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581695153] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:31:27,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966598788] [2022-11-26 00:31:27,686 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-26 00:31:27,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:31:27,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:31:27,688 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:31:27,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-26 00:31:28,226 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-26 00:31:28,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-26 00:31:28,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-26 00:31:28,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:31:28,240 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:31:28,264 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 21 treesize of output 20 [2022-11-26 00:31:28,307 INFO L321 Elim1Store]: treesize reduction 34, result has 33.3 percent of original size [2022-11-26 00:31:28,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 31 treesize of output 33 [2022-11-26 00:31:28,347 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,347 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 39 treesize of output 44 [2022-11-26 00:31:28,394 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 48 treesize of output 56 [2022-11-26 00:31:28,446 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 57 treesize of output 68 [2022-11-26 00:31:28,521 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 66 treesize of output 80 [2022-11-26 00:31:28,660 INFO L321 Elim1Store]: treesize reduction 124, result has 33.3 percent of original size [2022-11-26 00:31:28,660 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 28 case distinctions, treesize of input 76 treesize of output 93 [2022-11-26 00:31:28,739 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,739 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 84 treesize of output 104 [2022-11-26 00:31:28,825 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:28,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 93 treesize of output 116 [2022-11-26 00:31:31,384 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:31:31,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:31:40,480 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 142 treesize of output 138 [2022-11-26 00:31:40,505 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:31:40,506 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 34132 treesize of output 34124 [2022-11-26 00:31:41,493 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:31:41,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966598788] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-26 00:31:41,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1562522357] [2022-11-26 00:31:41,495 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-11-26 00:31:41,496 INFO L166 IcfgInterpreter]: Building call graph [2022-11-26 00:31:41,496 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-26 00:31:41,496 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-26 00:31:41,496 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-26 00:31:41,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:41,555 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-11-26 00:31:41,555 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 [2022-11-26 00:31:41,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:41,638 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-11-26 00:31:41,638 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 [2022-11-26 00:31:41,691 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-11-26 00:31:41,823 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:31:41,827 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,832 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,836 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,846 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,853 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 64 treesize of output 63 [2022-11-26 00:31:41,859 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 66 treesize of output 65 [2022-11-26 00:31:41,866 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 64 treesize of output 63 [2022-11-26 00:31:41,879 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,883 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,888 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:41,893 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:31:42,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,110 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,127 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 517 treesize of output 461 [2022-11-26 00:31:42,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 461 treesize of output 445 [2022-11-26 00:31:42,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 445 treesize of output 389 [2022-11-26 00:31:42,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,551 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-26 00:31:42,553 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 16 [2022-11-26 00:31:42,585 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-11-26 00:31:42,732 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-11-26 00:31:42,750 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-11-26 00:31:42,860 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-11-26 00:31:43,167 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:43,174 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:43,180 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-26 00:31:43,187 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 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-26 00:31:43,192 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-26 00:31:49,857 WARN L233 SmtUtils]: Spent 6.37s on a formula simplification. DAG size of input: 127 DAG size of output: 93 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:32:22,607 WARN L233 SmtUtils]: Spent 20.38s on a formula simplification. DAG size of input: 123 DAG size of output: 90 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:32:40,886 WARN L233 SmtUtils]: Spent 13.52s on a formula simplification. DAG size of input: 125 DAG size of output: 93 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-26 00:32:40,887 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4632#(and (= (select |#length| 3) 12) (exists ((v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120 Int)) (and (not (= 3 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120)) (= 16 (select |#length| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120)) (= (select |#valid| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120) 1) (not (= (mod (ite (= (ite (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120 0)) 1 0) 0) 0 1) 256) 0)) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120 0)) (< |#StackHeapBarrier| v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120) (not (= v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120 4)) (not (= 2 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120)) (<= 0 v_aws_linked_list_node_reset_~node.base_BEFORE_CALL_120))) (= |~#s_can_fail_allocator_static~0.base| 4) (= |~#s_can_fail_allocator_static~0.offset| 0) (= 2 (select |#length| 1)) (= (select |#valid| 3) 1) (= 37 (select |#length| 2)) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| 0) (exists ((v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_19 Int) (v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_19 Int) (aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68 Int)) (and (not (= (mod (select (select |#memory_int| v_aws_is_mem_zeroed_~buf_u8~0.base_BEFORE_RETURN_19) (+ v_aws_is_mem_zeroed_~buf_u8~0.offset_BEFORE_RETURN_19 (ite (<= (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68 18446744073709551616) 9223372036854775807) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68 18446744073709551616) (+ (- 18446744073709551616) (mod aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68 18446744073709551616))))) 256) 0)) (<= 0 aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68) (<= aux_mod_v_aws_is_mem_zeroed_~i~0_BEFORE_RETURN_19_68 18446744073709551614))) (= (select |#valid| 4) 1) (= (select |#valid| 1) 1) (= (select |#valid| 0) 0) (= ~tl_last_error~0 0) (= (select |#valid| 2) 1) (= |#NULL.offset| 0) (= 40 (select |#length| 4)) (< 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-11-26 00:32:40,888 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-26 00:32:40,888 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-26 00:32:40,888 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 25, 24] total 58 [2022-11-26 00:32:40,888 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780018194] [2022-11-26 00:32:40,888 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-26 00:32:40,888 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-26 00:32:40,889 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:32:40,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-26 00:32:40,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=5369, Unknown=2, NotChecked=0, Total=5700 [2022-11-26 00:32:40,891 INFO L87 Difference]: Start difference. First operand 60 states and 77 transitions. Second operand has 58 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 57 states have internal predecessors, (84), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:32:42,567 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:44,666 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:46,455 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:48,530 WARN L539 Checker$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] [2022-11-26 00:32:50,616 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:52,356 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.66s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:54,094 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:32:56,184 WARN L539 Checker$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] [2022-11-26 00:32:58,340 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.04s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:33:00,459 WARN L539 Checker$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] [2022-11-26 00:33:02,408 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-26 00:33:06,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:06,184 INFO L93 Difference]: Finished difference Result 126 states and 168 transitions. [2022-11-26 00:33:06,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-26 00:33:06,185 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 57 states have internal predecessors, (84), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2022-11-26 00:33:06,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:06,186 INFO L225 Difference]: With dead ends: 126 [2022-11-26 00:33:06,186 INFO L226 Difference]: Without dead ends: 85 [2022-11-26 00:33:06,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 69 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1849 ImplicationChecksByTransitivity, 65.2s TimeCoverageRelationStatistics Valid=390, Invalid=5928, Unknown=2, NotChecked=0, Total=6320 [2022-11-26 00:33:06,190 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 72 mSDsluCounter, 961 mSDsCounter, 0 mSdLazyCounter, 2060 mSolverCounterSat, 9 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 993 SdHoareTripleChecker+Invalid, 2075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2060 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.3s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:06,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 993 Invalid, 2075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2060 Invalid, 6 Unknown, 0 Unchecked, 24.3s Time] [2022-11-26 00:33:06,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-26 00:33:06,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 63. [2022-11-26 00:33:06,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.391304347826087) internal successors, (64), 49 states have internal predecessors, (64), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (10), 7 states have call predecessors, (10), 7 states have call successors, (10) [2022-11-26 00:33:06,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 82 transitions. [2022-11-26 00:33:06,209 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 82 transitions. Word has length 44 [2022-11-26 00:33:06,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:06,209 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 82 transitions. [2022-11-26 00:33:06,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.4736842105263157) internal successors, (84), 57 states have internal predecessors, (84), 4 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-26 00:33:06,210 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 82 transitions. [2022-11-26 00:33:06,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-26 00:33:06,211 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:06,211 INFO L195 NwaCegarLoop]: trace histogram [11, 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] [2022-11-26 00:33:06,218 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-26 00:33:06,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-26 00:33:06,413 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:06,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:06,413 INFO L85 PathProgramCache]: Analyzing trace with hash -668358389, now seen corresponding path program 1 times [2022-11-26 00:33:06,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:06,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633356323] [2022-11-26 00:33:06,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:06,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:06,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:33:06,656 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-11-26 00:33:06,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:06,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633356323] [2022-11-26 00:33:06,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633356323] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-26 00:33:06,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-26 00:33:06,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-26 00:33:06,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758222029] [2022-11-26 00:33:06,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-26 00:33:06,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-26 00:33:06,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-26 00:33:06,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-26 00:33:06,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-26 00:33:06,658 INFO L87 Difference]: Start difference. First operand 63 states and 82 transitions. Second operand has 6 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-26 00:33:06,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-26 00:33:06,740 INFO L93 Difference]: Finished difference Result 72 states and 90 transitions. [2022-11-26 00:33:06,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-26 00:33:06,741 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 48 [2022-11-26 00:33:06,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-26 00:33:06,742 INFO L225 Difference]: With dead ends: 72 [2022-11-26 00:33:06,742 INFO L226 Difference]: Without dead ends: 63 [2022-11-26 00:33:06,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-26 00:33:06,743 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 5 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-26 00:33:06,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 126 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-26 00:33:06,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-26 00:33:06,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-11-26 00:33:06,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.3478260869565217) internal successors, (62), 49 states have internal predecessors, (62), 8 states have call successors, (8), 6 states have call predecessors, (8), 8 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2022-11-26 00:33:06,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 79 transitions. [2022-11-26 00:33:06,769 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 79 transitions. Word has length 48 [2022-11-26 00:33:06,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-26 00:33:06,769 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 79 transitions. [2022-11-26 00:33:06,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-11-26 00:33:06,770 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 79 transitions. [2022-11-26 00:33:06,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-11-26 00:33:06,772 INFO L187 NwaCegarLoop]: Found error trace [2022-11-26 00:33:06,773 INFO L195 NwaCegarLoop]: trace histogram [11, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-26 00:33:06,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-26 00:33:06,773 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-26 00:33:06,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-26 00:33:06,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1751523209, now seen corresponding path program 10 times [2022-11-26 00:33:06,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-26 00:33:06,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144072660] [2022-11-26 00:33:06,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-26 00:33:06,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-26 00:33:06,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:33:07,508 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-11-26 00:33:07,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-26 00:33:07,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144072660] [2022-11-26 00:33:07,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144072660] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-26 00:33:07,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214053552] [2022-11-26 00:33:07,508 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-26 00:33:07,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-26 00:33:07,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 [2022-11-26 00:33:07,511 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-26 00:33:07,538 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a40ae77e-ffbd-4807-82e1-2bc25149b9f4/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-26 00:33:08,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-26 00:33:08,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 99 conjunts are in the unsatisfiable core [2022-11-26 00:33:08,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-26 00:33:08,202 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-26 00:33:08,230 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 21 treesize of output 20 [2022-11-26 00:33:08,265 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:33:08,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 30 treesize of output 32 [2022-11-26 00:33:08,331 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-11-26 00:33:08,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 40 treesize of output 45 [2022-11-26 00:33:08,384 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:33:08,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 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 48 treesize of output 56 [2022-11-26 00:33:08,478 INFO L321 Elim1Store]: treesize reduction 88, result has 33.3 percent of original size [2022-11-26 00:33:08,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 58 treesize of output 69 [2022-11-26 00:33:08,598 INFO L321 Elim1Store]: treesize reduction 128, result has 25.6 percent of original size [2022-11-26 00:33:08,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 20 case distinctions, treesize of input 68 treesize of output 82 [2022-11-26 00:33:08,673 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:33:08,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 75 treesize of output 92 [2022-11-26 00:33:08,834 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-11-26 00:33:08,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 84 treesize of output 104 [2022-11-26 00:33:09,006 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-11-26 00:33:09,007 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 84 treesize of output 104 [2022-11-26 00:33:09,177 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-11-26 00:33:09,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 36 case distinctions, treesize of input 84 treesize of output 104 [2022-11-26 00:33:12,055 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 3 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-26 00:33:12,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-26 00:34:42,774 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 148 treesize of output 144 [2022-11-26 00:34:42,842 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-26 00:34:42,845 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 2503404 treesize of output 2503084 [2022-11-26 00:34:51,380 WARN L233 SmtUtils]: Spent 8.53s on a formula simplification that was a NOOP. DAG size: 1356 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-26 00:35:33,707 WARN L233 SmtUtils]: Spent 16.05s on a formula simplification. DAG size of input: 993 DAG size of output: 993 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-26 00:35:57,674 WARN L233 SmtUtils]: Spent 10.70s on a formula simplification. DAG size of input: 991 DAG size of output: 991 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-26 00:36:20,653 WARN L233 SmtUtils]: Spent 16.96s on a formula simplification. DAG size of input: 933 DAG size of output: 933 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-26 00:40:26,123 WARN L233 SmtUtils]: Spent 11.59s on a formula simplification. DAG size of input: 926 DAG size of output: 926 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-11-26 00:40:50,704 WARN L233 SmtUtils]: Spent 18.35s on a formula simplification. DAG size of input: 862 DAG size of output: 862 (called from [L 800] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)