./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 2329fc70 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh --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-2329fc7 [2022-12-14 12:48:36,877 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 12:48:36,879 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 12:48:36,897 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 12:48:36,898 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 12:48:36,899 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 12:48:36,900 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 12:48:36,901 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 12:48:36,903 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 12:48:36,904 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 12:48:36,905 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 12:48:36,906 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 12:48:36,906 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 12:48:36,907 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 12:48:36,908 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 12:48:36,909 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 12:48:36,910 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 12:48:36,911 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 12:48:36,913 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 12:48:36,914 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 12:48:36,916 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 12:48:36,917 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 12:48:36,918 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 12:48:36,918 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 12:48:36,922 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 12:48:36,922 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 12:48:36,923 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 12:48:36,928 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 12:48:36,928 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 12:48:36,929 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 12:48:36,929 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 12:48:36,930 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 12:48:36,931 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 12:48:36,932 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 12:48:36,933 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 12:48:36,933 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 12:48:36,933 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 12:48:36,934 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 12:48:36,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 12:48:36,934 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 12:48:36,935 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 12:48:36,936 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-64bit-Taipan_Default.epf [2022-12-14 12:48:36,967 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 12:48:36,968 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 12:48:36,968 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 12:48:36,968 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 12:48:36,969 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 12:48:36,969 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 12:48:36,969 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 12:48:36,969 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 12:48:36,969 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 12:48:36,970 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 12:48:36,970 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 12:48:36,970 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 12:48:36,970 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 12:48:36,970 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 12:48:36,979 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 12:48:36,979 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 12:48:36,980 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 12:48:36,980 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 12:48:36,980 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 12:48:36,981 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 12:48:36,982 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 12:48:36,982 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 12:48:36,982 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 12:48:36,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:48:36,982 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 12:48:36,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 12:48:36,984 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 39617118f1cddf1edf0da2bed0d1b7ba56db146c1be6da9375c591252f5b5d55 [2022-12-14 12:48:37,139 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 12:48:37,154 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 12:48:37,155 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 12:48:37,156 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 12:48:37,156 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 12:48:37,157 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2022-12-14 12:48:39,712 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 12:48:39,958 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 12:48:39,958 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i [2022-12-14 12:48:39,975 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/data/2a5129b38/d29094453ba046079a6c28cb41bb601e/FLAG78096ce84 [2022-12-14 12:48:39,986 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/data/2a5129b38/d29094453ba046079a6c28cb41bb601e [2022-12-14 12:48:39,988 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 12:48:39,989 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 12:48:39,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 12:48:39,991 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 12:48:39,993 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 12:48:39,994 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:48:39" (1/1) ... [2022-12-14 12:48:39,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e2f3f76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:39, skipping insertion in model container [2022-12-14 12:48:39,995 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 12:48:39" (1/1) ... [2022-12-14 12:48:40,001 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 12:48:40,078 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 12:48:40,294 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2022-12-14 12:48:40,301 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2022-12-14 12:48:40,857 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,858 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,858 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,859 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,860 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,869 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,869 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,871 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,871 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,873 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,873 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,874 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,874 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:40,920 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:40,921 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:40,921 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:40,925 WARN L623 FunctionHandler]: Unknown extern function ntohl [2022-12-14 12:48:40,926 WARN L623 FunctionHandler]: Unknown extern function htons [2022-12-14 12:48:40,927 WARN L623 FunctionHandler]: Unknown extern function ntohs [2022-12-14 12:48:41,115 WARN L623 FunctionHandler]: Unknown extern function my_abort [2022-12-14 12:48:41,116 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-12-14 12:48:41,117 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-12-14 12:48:41,118 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-12-14 12:48:41,119 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-12-14 12:48:41,119 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-12-14 12:48:41,120 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-12-14 12:48:41,120 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-12-14 12:48:41,121 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-12-14 12:48:41,121 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-12-14 12:48:41,122 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-12-14 12:48:41,219 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-12-14 12:48:41,234 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:48:41,245 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 12:48:41,255 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4500,4513] [2022-12-14 12:48:41,255 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_a93fb18f-b29f-4f6a-a184-07d35df4af4b/sv-benchmarks/c/aws-c-common/aws_linked_list_node_reset_harness.i[4560,4573] [2022-12-14 12:48:41,281 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,282 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,282 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,282 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,283 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,288 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,288 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,289 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,289 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,290 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,290 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,291 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,291 WARN L1576 CHandler]: Possible shadowing of function index [2022-12-14 12:48:41,296 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:41,296 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:41,296 WARN L623 FunctionHandler]: Unknown extern function htonl [2022-12-14 12:48:41,299 WARN L623 FunctionHandler]: Unknown extern function ntohl [2022-12-14 12:48:41,300 WARN L623 FunctionHandler]: Unknown extern function htons [2022-12-14 12:48:41,300 WARN L623 FunctionHandler]: Unknown extern function ntohs [2022-12-14 12:48:41,315 WARN L623 FunctionHandler]: Unknown extern function my_abort [2022-12-14 12:48:41,316 WARN L611 FunctionHandler]: implicit declaration of function __atomic_load_n [2022-12-14 12:48:41,317 WARN L611 FunctionHandler]: implicit declaration of function __atomic_store_n [2022-12-14 12:48:41,317 WARN L611 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2022-12-14 12:48:41,318 WARN L611 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2022-12-14 12:48:41,318 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2022-12-14 12:48:41,319 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2022-12-14 12:48:41,319 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2022-12-14 12:48:41,319 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2022-12-14 12:48:41,320 WARN L611 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2022-12-14 12:48:41,320 WARN L611 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2022-12-14 12:48:41,336 WARN L611 FunctionHandler]: implicit declaration of function __builtin_va_copy [2022-12-14 12:48:41,347 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 12:48:41,540 INFO L208 MainTranslator]: Completed translation [2022-12-14 12:48:41,540 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41 WrapperNode [2022-12-14 12:48:41,540 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 12:48:41,541 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 12:48:41,541 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 12:48:41,541 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 12:48:41,548 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,593 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,612 INFO L138 Inliner]: procedures = 679, calls = 1031, calls flagged for inlining = 48, calls inlined = 3, statements flattened = 28 [2022-12-14 12:48:41,612 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 12:48:41,613 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 12:48:41,613 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 12:48:41,613 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 12:48:41,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,620 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,622 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,623 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,629 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,634 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,635 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,637 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 12:48:41,638 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 12:48:41,638 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 12:48:41,638 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 12:48:41,639 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (1/1) ... [2022-12-14 12:48:41,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 12:48:41,652 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:48:41,664 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 12:48:41,666 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure aws_linked_list_node_reset [2022-12-14 12:48:41,695 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_linked_list_node_reset [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_mem_zeroed [2022-12-14 12:48:41,695 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_mem_zeroed [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-12-14 12:48:41,695 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-12-14 12:48:41,695 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 12:48:41,696 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 12:48:41,696 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 12:48:41,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2022-12-14 12:48:41,696 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2022-12-14 12:48:41,696 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-12-14 12:48:41,696 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-12-14 12:48:41,696 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 12:48:41,696 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-12-14 12:48:41,697 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 12:48:41,865 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 12:48:41,867 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 12:48:41,983 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 12:48:42,006 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 12:48:42,007 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 12:48:42,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:48:42 BoogieIcfgContainer [2022-12-14 12:48:42,008 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 12:48:42,010 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 12:48:42,011 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 12:48:42,013 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 12:48:42,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 12:48:39" (1/3) ... [2022-12-14 12:48:42,014 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56a46237 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:48:42, skipping insertion in model container [2022-12-14 12:48:42,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 12:48:41" (2/3) ... [2022-12-14 12:48:42,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56a46237 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 12:48:42, skipping insertion in model container [2022-12-14 12:48:42,015 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 12:48:42" (3/3) ... [2022-12-14 12:48:42,016 INFO L112 eAbstractionObserver]: Analyzing ICFG aws_linked_list_node_reset_harness.i [2022-12-14 12:48:42,032 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 12:48:42,032 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 12:48:42,071 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 12:48:42,077 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;@62e08798, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 12:48:42,077 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 12:48:42,081 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) [2022-12-14 12:48:42,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 12:48:42,087 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:48:42,088 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 12:48:42,088 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:48:42,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:48:42,092 INFO L85 PathProgramCache]: Analyzing trace with hash 325938203, now seen corresponding path program 1 times [2022-12-14 12:48:42,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:48:42,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593448479] [2022-12-14 12:48:42,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:42,099 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:48:42,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:42,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:42,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:48:42,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593448479] [2022-12-14 12:48:42,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593448479] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:48:42,265 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:48:42,265 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 12:48:42,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327465063] [2022-12-14 12:48:42,267 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:48:42,276 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 12:48:42,276 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:48:42,297 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 12:48:42,297 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 12:48:42,299 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) [2022-12-14 12:48:42,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:48:42,327 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2022-12-14 12:48:42,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 12:48:42,329 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 [2022-12-14 12:48:42,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:48:42,334 INFO L225 Difference]: With dead ends: 56 [2022-12-14 12:48:42,334 INFO L226 Difference]: Without dead ends: 29 [2022-12-14 12:48:42,336 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 [2022-12-14 12:48:42,338 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 [2022-12-14 12:48:42,339 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] [2022-12-14 12:48:42,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-12-14 12:48:42,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-12-14 12:48:42,363 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) [2022-12-14 12:48:42,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-12-14 12:48:42,364 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 16 [2022-12-14 12:48:42,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:48:42,365 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-12-14 12:48:42,365 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) [2022-12-14 12:48:42,365 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-12-14 12:48:42,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 12:48:42,366 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:48:42,366 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] [2022-12-14 12:48:42,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 12:48:42,366 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:48:42,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:48:42,367 INFO L85 PathProgramCache]: Analyzing trace with hash -805366998, now seen corresponding path program 1 times [2022-12-14 12:48:42,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:48:42,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783268600] [2022-12-14 12:48:42,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:42,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:48:42,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:42,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:42,549 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:48:42,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783268600] [2022-12-14 12:48:42,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [783268600] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:48:42,550 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:48:42,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 12:48:42,550 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816522400] [2022-12-14 12:48:42,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:48:42,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 12:48:42,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:48:42,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 12:48:42,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:48:42,552 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) [2022-12-14 12:48:42,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:48:42,608 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2022-12-14 12:48:42,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:48:42,608 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 [2022-12-14 12:48:42,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:48:42,610 INFO L225 Difference]: With dead ends: 39 [2022-12-14 12:48:42,610 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 12:48:42,610 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 [2022-12-14 12:48:42,611 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 5 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:48:42,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:48:42,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 12:48:42,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2022-12-14 12:48:42,617 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) [2022-12-14 12:48:42,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-12-14 12:48:42,617 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 21 [2022-12-14 12:48:42,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:48:42,618 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-12-14 12:48:42,618 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) [2022-12-14 12:48:42,618 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-12-14 12:48:42,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 12:48:42,619 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:48:42,619 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] [2022-12-14 12:48:42,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 12:48:42,619 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:48:42,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:48:42,620 INFO L85 PathProgramCache]: Analyzing trace with hash 989415369, now seen corresponding path program 1 times [2022-12-14 12:48:42,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:48:42,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739287171] [2022-12-14 12:48:42,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:42,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:48:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:42,749 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:42,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:48:42,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739287171] [2022-12-14 12:48:42,750 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739287171] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:48:42,750 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:48:42,750 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 12:48:42,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532355291] [2022-12-14 12:48:42,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:48:42,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 12:48:42,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:48:42,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 12:48:42,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 12:48:42,752 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) [2022-12-14 12:48:42,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:48:42,790 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2022-12-14 12:48:42,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 12:48:42,790 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 [2022-12-14 12:48:42,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:48:42,791 INFO L225 Difference]: With dead ends: 64 [2022-12-14 12:48:42,791 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 12:48:42,791 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 [2022-12-14 12:48:42,792 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, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:48:42,792 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 76 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 12:48:42,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 12:48:42,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-12-14 12:48:42,796 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) [2022-12-14 12:48:42,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 42 transitions. [2022-12-14 12:48:42,797 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 42 transitions. Word has length 22 [2022-12-14 12:48:42,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:48:42,797 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 42 transitions. [2022-12-14 12:48:42,798 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) [2022-12-14 12:48:42,798 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 42 transitions. [2022-12-14 12:48:42,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 12:48:42,799 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:48:42,799 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] [2022-12-14 12:48:42,799 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 12:48:42,799 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:48:42,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:48:42,800 INFO L85 PathProgramCache]: Analyzing trace with hash -518460441, now seen corresponding path program 1 times [2022-12-14 12:48:42,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:48:42,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501665053] [2022-12-14 12:48:42,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:42,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:48:42,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:42,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:42,967 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:48:42,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501665053] [2022-12-14 12:48:42,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501665053] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:48:42,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796534701] [2022-12-14 12:48:42,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:42,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:48:42,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:48:42,969 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:48:42,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 12:48:43,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:43,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 12:48:43,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:48:43,189 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 [2022-12-14 12:48:43,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:43,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:48:43,655 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 [2022-12-14 12:48:43,660 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 [2022-12-14 12:48:43,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:43,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796534701] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:48:43,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [198350185] [2022-12-14 12:48:43,706 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:48:43,706 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:48:43,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:48:43,714 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:48:43,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:48:43,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:43,785 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:48:43,785 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 [2022-12-14 12:48:43,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:43,805 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 [2022-12-14 12:48:43,836 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:48:44,029 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 [2022-12-14 12:48:44,033 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 [2022-12-14 12:48:44,037 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 [2022-12-14 12:48:44,042 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 [2022-12-14 12:48:44,080 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:48:44,081 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 [2022-12-14 12:48:44,100 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:48:44,101 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 [2022-12-14 12:48:44,121 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:48:44,121 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 [2022-12-14 12:48:44,139 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 [2022-12-14 12:48:44,151 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 [2022-12-14 12:48:44,155 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 [2022-12-14 12:48:44,160 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 [2022-12-14 12:48:44,165 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 [2022-12-14 12:48:44,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,309 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 [2022-12-14 12:48:44,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,327 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 [2022-12-14 12:48:44,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,369 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 [2022-12-14 12:48:44,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,382 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 [2022-12-14 12:48:44,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,432 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,433 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 [2022-12-14 12:48:44,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,440 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,441 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,442 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 [2022-12-14 12:48:44,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,473 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 [2022-12-14 12:48:44,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:44,486 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 [2022-12-14 12:48:44,557 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 74 for LOIs [2022-12-14 12:48:44,612 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:48:44,632 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:48:44,660 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-12-14 12:48:44,968 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 [2022-12-14 12:48:44,974 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 [2022-12-14 12:48:44,986 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 [2022-12-14 12:48:44,994 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 [2022-12-14 12:48:45,003 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:48:48,085 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 [2022-12-14 12:48:48,085 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:48:48,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:48:48,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9, 8] total 17 [2022-12-14 12:48:48,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635669100] [2022-12-14 12:48:48,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:48:48,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 12:48:48,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:48:48,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 12:48:48,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1017, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 12:48:48,087 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) [2022-12-14 12:48:48,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:48:48,374 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2022-12-14 12:48:48,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 12:48:48,375 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 [2022-12-14 12:48:48,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:48:48,375 INFO L225 Difference]: With dead ends: 71 [2022-12-14 12:48:48,375 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 12:48:48,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=138, Invalid=1344, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 12:48:48,376 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 29 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 12:48:48,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 159 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 12:48:48,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 12:48:48,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-12-14 12:48:48,381 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) [2022-12-14 12:48:48,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2022-12-14 12:48:48,382 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 23 [2022-12-14 12:48:48,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:48:48,382 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2022-12-14 12:48:48,382 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) [2022-12-14 12:48:48,382 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2022-12-14 12:48:48,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 12:48:48,382 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:48:48,383 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] [2022-12-14 12:48:48,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 12:48:48,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:48:48,585 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:48:48,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:48:48,586 INFO L85 PathProgramCache]: Analyzing trace with hash 1249058711, now seen corresponding path program 1 times [2022-12-14 12:48:48,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:48:48,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095380063] [2022-12-14 12:48:48,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:48,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:48:48,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:48,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 12:48:48,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:48:48,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095380063] [2022-12-14 12:48:48,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095380063] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:48:48,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831936501] [2022-12-14 12:48:48,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:48:48,754 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:48:48,754 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:48:48,755 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:48:48,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 12:48:48,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:48:48,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 12:48:48,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:48:48,847 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 [2022-12-14 12:48:48,857 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 [2022-12-14 12:48:49,095 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:49,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:48:49,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2022-12-14 12:48:49,517 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 [2022-12-14 12:48:49,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:48:49,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831936501] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:48:49,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1884977101] [2022-12-14 12:48:49,543 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:48:49,543 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:48:49,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:48:49,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:48:49,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:48:49,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,587 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-12-14 12:48:49,587 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 [2022-12-14 12:48:49,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,634 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:48:49,634 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 [2022-12-14 12:48:49,653 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:48:49,767 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 [2022-12-14 12:48:49,771 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 14 treesize of output 10 [2022-12-14 12:48:49,774 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 [2022-12-14 12:48:49,779 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 [2022-12-14 12:48:49,787 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 [2022-12-14 12:48:49,792 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 [2022-12-14 12:48:49,798 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 [2022-12-14 12:48:49,804 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 [2022-12-14 12:48:49,815 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 [2022-12-14 12:48:49,818 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 [2022-12-14 12:48:49,822 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 [2022-12-14 12:48:49,825 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 [2022-12-14 12:48:49,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,937 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 [2022-12-14 12:48:49,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:49,946 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 [2022-12-14 12:48:50,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,024 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 [2022-12-14 12:48:50,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,035 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 [2022-12-14 12:48:50,151 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 [2022-12-14 12:48:50,164 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 [2022-12-14 12:48:50,175 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 [2022-12-14 12:48:50,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,329 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 [2022-12-14 12:48:50,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:48:50,339 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 [2022-12-14 12:48:50,362 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:48:50,483 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:48:50,497 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:48:50,594 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:48:50,891 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 14 treesize of output 10 [2022-12-14 12:48:50,898 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 [2022-12-14 12:48:50,904 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 [2022-12-14 12:48:50,910 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 [2022-12-14 12:48:50,918 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:49:06,952 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 [2022-12-14 12:49:06,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:49:06,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:49:06,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 10] total 22 [2022-12-14 12:49:06,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477413792] [2022-12-14 12:49:06,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:49:06,953 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 12:49:06,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:49:06,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 12:49:06,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1440, Unknown=5, NotChecked=0, Total=1560 [2022-12-14 12:49:06,955 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) [2022-12-14 12:49:07,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:49:07,691 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2022-12-14 12:49:07,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 12:49:07,692 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 [2022-12-14 12:49:07,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:49:07,692 INFO L225 Difference]: With dead ends: 82 [2022-12-14 12:49:07,692 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 12:49:07,694 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 542 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=173, Invalid=1984, Unknown=5, NotChecked=0, Total=2162 [2022-12-14 12:49:07,694 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 28 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:49:07,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 222 Invalid, 320 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:49:07,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 12:49:07,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2022-12-14 12:49:07,702 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) [2022-12-14 12:49:07,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2022-12-14 12:49:07,703 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 26 [2022-12-14 12:49:07,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:49:07,703 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2022-12-14 12:49:07,703 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) [2022-12-14 12:49:07,703 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2022-12-14 12:49:07,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 12:49:07,704 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:49:07,704 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] [2022-12-14 12:49:07,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 12:49:07,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:49:07,906 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:49:07,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:49:07,907 INFO L85 PathProgramCache]: Analyzing trace with hash -842842685, now seen corresponding path program 2 times [2022-12-14 12:49:07,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:49:07,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453507923] [2022-12-14 12:49:07,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:49:07,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:49:07,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:49:08,157 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:49:08,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:49:08,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453507923] [2022-12-14 12:49:08,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453507923] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:49:08,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266603677] [2022-12-14 12:49:08,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:49:08,158 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:49:08,158 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:49:08,159 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:49:08,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 12:49:08,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 12:49:08,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:49:08,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 63 conjunts are in the unsatisfiable core [2022-12-14 12:49:08,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:49:08,335 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 [2022-12-14 12:49:08,352 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 [2022-12-14 12:49:08,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:49:08,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:49:08,564 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266603677] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:49:08,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2097894001] [2022-12-14 12:49:08,566 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:49:08,566 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:49:08,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:49:08,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:49:08,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:49:08,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,618 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:49:08,619 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 [2022-12-14 12:49:08,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,631 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 [2022-12-14 12:49:08,647 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:49:08,761 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 [2022-12-14 12:49:08,764 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 [2022-12-14 12:49:08,768 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 [2022-12-14 12:49:08,771 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 11 treesize of output 7 [2022-12-14 12:49:08,799 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:49:08,799 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 [2022-12-14 12:49:08,822 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:49:08,822 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 [2022-12-14 12:49:08,840 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:49:08,840 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 [2022-12-14 12:49:08,858 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 [2022-12-14 12:49:08,867 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 [2022-12-14 12:49:08,871 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 [2022-12-14 12:49:08,875 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 [2022-12-14 12:49:08,881 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 [2022-12-14 12:49:08,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:08,994 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 [2022-12-14 12:49:09,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,010 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 [2022-12-14 12:49:09,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,101 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 [2022-12-14 12:49:09,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,113 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 [2022-12-14 12:49:09,229 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 [2022-12-14 12:49:09,241 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 [2022-12-14 12:49:09,252 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 [2022-12-14 12:49:09,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,409 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,411 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 [2022-12-14 12:49:09,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,421 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:09,421 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 [2022-12-14 12:49:09,445 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:49:09,583 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:49:09,604 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 68 for LOIs [2022-12-14 12:49:09,688 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:49:09,988 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 [2022-12-14 12:49:09,993 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 [2022-12-14 12:49:10,002 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 [2022-12-14 12:49:10,006 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 [2022-12-14 12:49:10,013 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:49:16,175 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 [2022-12-14 12:49:16,175 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:49:16,175 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 12:49:16,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10] total 14 [2022-12-14 12:49:16,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660061582] [2022-12-14 12:49:16,176 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 12:49:16,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 12:49:16,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:49:16,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 12:49:16,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=909, Unknown=0, NotChecked=0, Total=992 [2022-12-14 12:49:16,177 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) [2022-12-14 12:49:16,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:49:16,460 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2022-12-14 12:49:16,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 12:49:16,461 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 [2022-12-14 12:49:16,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:49:16,462 INFO L225 Difference]: With dead ends: 79 [2022-12-14 12:49:16,462 INFO L226 Difference]: Without dead ends: 46 [2022-12-14 12:49:16,463 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=107, Invalid=1153, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 12:49:16,463 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 12:49:16,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 229 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 12:49:16,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-12-14 12:49:16,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-12-14 12:49:16,468 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) [2022-12-14 12:49:16,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2022-12-14 12:49:16,469 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 29 [2022-12-14 12:49:16,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:49:16,469 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2022-12-14 12:49:16,469 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) [2022-12-14 12:49:16,469 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2022-12-14 12:49:16,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 12:49:16,470 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:49:16,470 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] [2022-12-14 12:49:16,476 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 12:49:16,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 12:49:16,672 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:49:16,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:49:16,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1139170277, now seen corresponding path program 3 times [2022-12-14 12:49:16,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:49:16,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383342660] [2022-12-14 12:49:16,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:49:16,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:49:16,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:49:16,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 12:49:16,940 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:49:16,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383342660] [2022-12-14 12:49:16,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383342660] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:49:16,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457962071] [2022-12-14 12:49:16,940 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:49:16,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:49:16,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:49:16,941 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:49:16,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 12:49:17,058 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:49:17,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:49:17,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 12:49:17,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:49:17,068 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 [2022-12-14 12:49:17,085 INFO L321 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2022-12-14 12:49:17,085 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 [2022-12-14 12:49:17,108 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:49:17,109 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 [2022-12-14 12:49:17,134 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:49:17,134 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 [2022-12-14 12:49:17,505 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:49:17,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:49:18,147 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 [2022-12-14 12:49:18,152 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 [2022-12-14 12:49:18,217 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:49:18,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457962071] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:49:18,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [661812248] [2022-12-14 12:49:18,219 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:49:18,219 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:49:18,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:49:18,220 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:49:18,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:49:18,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,256 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-12-14 12:49:18,256 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 [2022-12-14 12:49:18,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,298 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:49:18,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 12 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 6 case distinctions, treesize of input 37 treesize of output 61 [2022-12-14 12:49:18,319 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:49:18,417 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 [2022-12-14 12:49:18,420 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 [2022-12-14 12:49:18,423 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 [2022-12-14 12:49:18,426 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 [2022-12-14 12:49:18,436 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 [2022-12-14 12:49:18,441 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 [2022-12-14 12:49:18,446 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 [2022-12-14 12:49:18,454 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 [2022-12-14 12:49:18,464 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 [2022-12-14 12:49:18,467 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 [2022-12-14 12:49:18,471 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 [2022-12-14 12:49:18,475 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 [2022-12-14 12:49:18,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,575 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 [2022-12-14 12:49:18,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,585 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 [2022-12-14 12:49:18,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,659 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 [2022-12-14 12:49:18,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,666 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,668 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 [2022-12-14 12:49:18,770 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 [2022-12-14 12:49:18,780 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 [2022-12-14 12:49:18,788 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 [2022-12-14 12:49:18,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,944 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 [2022-12-14 12:49:18,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:49:18,953 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 [2022-12-14 12:49:18,986 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:49:19,113 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:49:19,134 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:49:19,227 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:49:19,487 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 [2022-12-14 12:49:19,491 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 [2022-12-14 12:49:19,495 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 14 treesize of output 10 [2022-12-14 12:49:19,500 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 [2022-12-14 12:49:19,505 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:49:28,179 WARN L233 SmtUtils]: Spent 8.55s 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) [2022-12-14 12:50:09,976 WARN L233 SmtUtils]: Spent 25.47s 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) [2022-12-14 12:50:09,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1672#(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 [2022-12-14 12:50:09,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:50:09,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:50:09,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 14, 13] total 30 [2022-12-14 12:50:09,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863649633] [2022-12-14 12:50:09,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:50:09,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 12:50:09,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:50:09,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 12:50:09,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2096, Unknown=4, NotChecked=0, Total=2256 [2022-12-14 12:50:09,979 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) [2022-12-14 12:50:10,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:50:10,883 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-12-14 12:50:10,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 12:50:10,884 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 [2022-12-14 12:50:10,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:50:10,885 INFO L225 Difference]: With dead ends: 88 [2022-12-14 12:50:10,885 INFO L226 Difference]: Without dead ends: 55 [2022-12-14 12:50:10,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 51.6s TimeCoverageRelationStatistics Valid=217, Invalid=2749, Unknown=4, NotChecked=0, Total=2970 [2022-12-14 12:50:10,886 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 41 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 12:50:10,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 306 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 12:50:10,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-12-14 12:50:10,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2022-12-14 12:50:10,892 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) [2022-12-14 12:50:10,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2022-12-14 12:50:10,892 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 30 [2022-12-14 12:50:10,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:50:10,893 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2022-12-14 12:50:10,893 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) [2022-12-14 12:50:10,893 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2022-12-14 12:50:10,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 12:50:10,893 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:50:10,893 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] [2022-12-14 12:50:10,898 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 12:50:11,094 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 12:50:11,095 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:50:11,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:50:11,097 INFO L85 PathProgramCache]: Analyzing trace with hash -197615727, now seen corresponding path program 4 times [2022-12-14 12:50:11,097 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:50:11,097 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492998479] [2022-12-14 12:50:11,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:50:11,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:50:11,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:50:11,377 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 12:50:11,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:50:11,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492998479] [2022-12-14 12:50:11,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492998479] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:50:11,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835208377] [2022-12-14 12:50:11,377 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:50:11,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:50:11,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:50:11,378 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:50:11,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 12:50:11,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:50:11,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 63 conjunts are in the unsatisfiable core [2022-12-14 12:50:11,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:50:11,517 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 [2022-12-14 12:50:11,529 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 [2022-12-14 12:50:11,551 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:11,551 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 [2022-12-14 12:50:11,580 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-12-14 12:50:11,580 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 [2022-12-14 12:50:11,604 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:11,604 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 [2022-12-14 12:50:12,274 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:50:12,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:50:14,125 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 [2022-12-14 12:50:14,131 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:14,131 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 [2022-12-14 12:50:14,223 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:50:14,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835208377] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:50:14,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371059580] [2022-12-14 12:50:14,225 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:50:14,225 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:50:14,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:50:14,225 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:50:14,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:50:14,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,269 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:50:14,270 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 [2022-12-14 12:50:14,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,280 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 [2022-12-14 12:50:14,295 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:50:14,381 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 [2022-12-14 12:50:14,383 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 [2022-12-14 12:50:14,386 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 [2022-12-14 12:50:14,389 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 [2022-12-14 12:50:14,419 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:50:14,419 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 [2022-12-14 12:50:14,437 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:50:14,438 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 [2022-12-14 12:50:14,454 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:50:14,455 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 [2022-12-14 12:50:14,468 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 [2022-12-14 12:50:14,476 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 [2022-12-14 12:50:14,480 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 [2022-12-14 12:50:14,484 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 [2022-12-14 12:50:14,488 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 [2022-12-14 12:50:14,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,597 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 [2022-12-14 12:50:14,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,608 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 [2022-12-14 12:50:14,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,667 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,669 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 [2022-12-14 12:50:14,679 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,681 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,681 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 [2022-12-14 12:50:14,781 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 [2022-12-14 12:50:14,791 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 [2022-12-14 12:50:14,798 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 [2022-12-14 12:50:14,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,924 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 [2022-12-14 12:50:14,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:14,933 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 [2022-12-14 12:50:14,955 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:50:15,058 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:50:15,071 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:50:15,152 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-12-14 12:50:15,419 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 14 treesize of output 10 [2022-12-14 12:50:15,424 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 [2022-12-14 12:50:15,432 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 [2022-12-14 12:50:15,437 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 [2022-12-14 12:50:15,444 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:50:21,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2129#(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 [2022-12-14 12:50:21,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:50:21,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:50:21,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 17, 16] total 37 [2022-12-14 12:50:21,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167059962] [2022-12-14 12:50:21,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:50:21,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 12:50:21,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:50:21,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 12:50:21,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2677, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 12:50:21,991 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) [2022-12-14 12:50:25,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:50:25,570 INFO L93 Difference]: Finished difference Result 97 states and 124 transitions. [2022-12-14 12:50:25,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 12:50:25,571 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 [2022-12-14 12:50:25,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:50:25,572 INFO L225 Difference]: With dead ends: 97 [2022-12-14 12:50:25,572 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 12:50:25,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 52 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=261, Invalid=3521, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 12:50:25,573 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 52 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-12-14 12:50:25,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 413 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-12-14 12:50:25,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 12:50:25,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2022-12-14 12:50:25,580 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) [2022-12-14 12:50:25,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 65 transitions. [2022-12-14 12:50:25,580 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 65 transitions. Word has length 33 [2022-12-14 12:50:25,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:50:25,581 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 65 transitions. [2022-12-14 12:50:25,581 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) [2022-12-14 12:50:25,581 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 65 transitions. [2022-12-14 12:50:25,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 12:50:25,581 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:50:25,581 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] [2022-12-14 12:50:25,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 12:50:25,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:50:25,783 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:50:25,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:50:25,784 INFO L85 PathProgramCache]: Analyzing trace with hash 700550721, now seen corresponding path program 5 times [2022-12-14 12:50:25,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:50:25,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1224732174] [2022-12-14 12:50:25,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:50:25,785 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:50:25,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:50:26,092 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 12:50:26,092 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:50:26,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1224732174] [2022-12-14 12:50:26,092 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1224732174] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:50:26,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110832309] [2022-12-14 12:50:26,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:50:26,093 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:50:26,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:50:26,093 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:50:26,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 12:50:26,300 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 12:50:26,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:50:26,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 89 conjunts are in the unsatisfiable core [2022-12-14 12:50:26,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:50:26,347 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 [2022-12-14 12:50:26,366 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 [2022-12-14 12:50:26,386 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:26,387 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 [2022-12-14 12:50:26,423 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-12-14 12:50:26,424 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 [2022-12-14 12:50:26,454 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:26,454 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 [2022-12-14 12:50:26,505 INFO L321 Elim1Store]: treesize reduction 88, result has 33.3 percent of original size [2022-12-14 12:50:26,505 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 [2022-12-14 12:50:26,577 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 12:50:26,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:50:26,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110832309] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:50:26,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [34699413] [2022-12-14 12:50:26,793 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:50:26,793 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:50:26,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:50:26,794 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:50:26,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:50:26,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:26,834 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:50:26,834 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 [2022-12-14 12:50:26,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:26,846 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 [2022-12-14 12:50:26,861 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:50:26,944 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 [2022-12-14 12:50:26,946 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 [2022-12-14 12:50:26,949 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 11 treesize of output 7 [2022-12-14 12:50:26,953 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 [2022-12-14 12:50:26,962 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 [2022-12-14 12:50:26,985 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:50:26,985 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 [2022-12-14 12:50:27,007 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:50:27,007 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 [2022-12-14 12:50:27,026 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:50:27,027 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 [2022-12-14 12:50:27,047 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 [2022-12-14 12:50:27,051 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 [2022-12-14 12:50:27,054 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 [2022-12-14 12:50:27,059 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 [2022-12-14 12:50:27,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,173 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 [2022-12-14 12:50:27,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,188 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,188 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 [2022-12-14 12:50:27,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,263 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 [2022-12-14 12:50:27,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,274 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 [2022-12-14 12:50:27,385 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 [2022-12-14 12:50:27,397 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 [2022-12-14 12:50:27,411 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 [2022-12-14 12:50:27,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,549 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 [2022-12-14 12:50:27,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:27,560 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 [2022-12-14 12:50:27,593 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:50:27,715 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:50:27,732 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:50:27,812 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:50:28,071 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 [2022-12-14 12:50:28,076 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 [2022-12-14 12:50:28,081 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 [2022-12-14 12:50:28,086 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 [2022-12-14 12:50:28,090 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:50:38,957 WARN L233 SmtUtils]: Spent 5.10s 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) [2022-12-14 12:50:47,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2519#(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 [2022-12-14 12:50:47,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:50:47,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 12:50:47,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 20 [2022-12-14 12:50:47,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747005965] [2022-12-14 12:50:47,430 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 12:50:47,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 12:50:47,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:50:47,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 12:50:47,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1614, Unknown=2, NotChecked=0, Total=1722 [2022-12-14 12:50:47,432 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) [2022-12-14 12:50:48,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:50:48,131 INFO L93 Difference]: Finished difference Result 90 states and 116 transitions. [2022-12-14 12:50:48,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 12:50:48,132 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 [2022-12-14 12:50:48,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:50:48,132 INFO L225 Difference]: With dead ends: 90 [2022-12-14 12:50:48,132 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 12:50:48,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 20.1s TimeCoverageRelationStatistics Valid=150, Invalid=2298, Unknown=2, NotChecked=0, Total=2450 [2022-12-14 12:50:48,133 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:50:48,133 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 261 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 314 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 12:50:48,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 12:50:48,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-12-14 12:50:48,140 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) [2022-12-14 12:50:48,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 66 transitions. [2022-12-14 12:50:48,140 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 66 transitions. Word has length 36 [2022-12-14 12:50:48,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:50:48,140 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 66 transitions. [2022-12-14 12:50:48,140 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) [2022-12-14 12:50:48,141 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 66 transitions. [2022-12-14 12:50:48,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 12:50:48,141 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:50:48,141 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] [2022-12-14 12:50:48,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 12:50:48,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:50:48,343 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:50:48,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:50:48,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1164486111, now seen corresponding path program 6 times [2022-12-14 12:50:48,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:50:48,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494705988] [2022-12-14 12:50:48,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:50:48,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:50:48,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:50:48,668 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 12:50:48,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:50:48,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494705988] [2022-12-14 12:50:48,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494705988] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:50:48,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072102883] [2022-12-14 12:50:48,669 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:50:48,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:50:48,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:50:48,670 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:50:48,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 12:50:48,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:50:48,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:50:48,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 12:50:48,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:50:48,904 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 [2022-12-14 12:50:48,922 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 [2022-12-14 12:50:48,942 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:48,942 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 [2022-12-14 12:50:48,977 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-12-14 12:50:48,978 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 [2022-12-14 12:50:49,010 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:49,010 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 [2022-12-14 12:50:49,057 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:49,057 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 [2022-12-14 12:50:49,100 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:50:49,100 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 [2022-12-14 12:50:49,805 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:50:49,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:50:51,963 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 [2022-12-14 12:50:51,968 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 [2022-12-14 12:50:54,782 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 1 proven. 47 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:50:54,782 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072102883] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:50:54,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [216578463] [2022-12-14 12:50:54,784 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:50:54,784 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:50:54,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:50:54,784 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:50:54,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:50:54,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:54,825 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-12-14 12:50:54,825 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 [2022-12-14 12:50:54,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:54,867 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:50:54,867 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 [2022-12-14 12:50:54,883 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:50:54,980 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 16 treesize of output 12 [2022-12-14 12:50:54,983 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 [2022-12-14 12:50:54,986 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 [2022-12-14 12:50:54,990 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 [2022-12-14 12:50:54,999 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 [2022-12-14 12:50:55,004 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 [2022-12-14 12:50:55,009 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 [2022-12-14 12:50:55,016 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 [2022-12-14 12:50:55,026 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 [2022-12-14 12:50:55,029 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 [2022-12-14 12:50:55,032 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 14 treesize of output 10 [2022-12-14 12:50:55,035 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 [2022-12-14 12:50:55,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,144 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 [2022-12-14 12:50:55,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,156 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 [2022-12-14 12:50:55,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,232 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 [2022-12-14 12:50:55,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,240 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 [2022-12-14 12:50:55,343 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 [2022-12-14 12:50:55,355 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 461 treesize of output 405 [2022-12-14 12:50:55,365 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 [2022-12-14 12:50:55,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,511 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 [2022-12-14 12:50:55,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:50:55,525 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 [2022-12-14 12:50:55,560 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:50:55,692 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:50:55,707 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:50:55,801 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:50:56,063 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 [2022-12-14 12:50:56,071 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 [2022-12-14 12:50:56,077 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 [2022-12-14 12:50:56,082 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 [2022-12-14 12:50:56,090 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:51:18,826 WARN L233 SmtUtils]: Spent 18.21s on a formula simplification. DAG size of input: 183 DAG size of output: 127 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-12-14 12:51:22,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3026#(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 [2022-12-14 12:51:22,233 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:51:22,233 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:51:22,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 22, 18] total 46 [2022-12-14 12:51:22,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654912143] [2022-12-14 12:51:22,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:51:22,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 12:51:22,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:51:22,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 12:51:22,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=3661, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 12:51:22,234 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) [2022-12-14 12:51:26,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:51:26,402 INFO L93 Difference]: Finished difference Result 107 states and 139 transitions. [2022-12-14 12:51:26,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 12:51:26,403 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 [2022-12-14 12:51:26,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:51:26,404 INFO L225 Difference]: With dead ends: 107 [2022-12-14 12:51:26,404 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 12:51:26,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1238 ImplicationChecksByTransitivity, 30.4s TimeCoverageRelationStatistics Valid=359, Invalid=5191, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 12:51:26,406 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 65 mSDsluCounter, 492 mSDsCounter, 0 mSdLazyCounter, 1223 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 519 SdHoareTripleChecker+Invalid, 1260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 12:51:26,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 519 Invalid, 1260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1223 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 12:51:26,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 12:51:26,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 56. [2022-12-14 12:51:26,419 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) [2022-12-14 12:51:26,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2022-12-14 12:51:26,420 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 37 [2022-12-14 12:51:26,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:51:26,420 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2022-12-14 12:51:26,420 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) [2022-12-14 12:51:26,420 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2022-12-14 12:51:26,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 12:51:26,421 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:51:26,421 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] [2022-12-14 12:51:26,426 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 12:51:26,622 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 12:51:26,623 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:51:26,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:51:26,624 INFO L85 PathProgramCache]: Analyzing trace with hash -682223601, now seen corresponding path program 7 times [2022-12-14 12:51:26,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:51:26,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [414597192] [2022-12-14 12:51:26,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:51:26,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:51:26,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:51:27,030 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 12:51:27,030 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:51:27,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [414597192] [2022-12-14 12:51:27,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [414597192] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:51:27,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788116580] [2022-12-14 12:51:27,031 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:51:27,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:51:27,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:51:27,031 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:51:27,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 12:51:27,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:51:27,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 12:51:27,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:51:27,294 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 [2022-12-14 12:51:27,308 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 [2022-12-14 12:51:27,333 INFO L321 Elim1Store]: treesize reduction 34, result has 33.3 percent of original size [2022-12-14 12:51:27,334 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 [2022-12-14 12:51:27,374 INFO L321 Elim1Store]: treesize reduction 50, result has 25.4 percent of original size [2022-12-14 12:51:27,375 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 [2022-12-14 12:51:27,421 INFO L321 Elim1Store]: treesize reduction 66, result has 20.5 percent of original size [2022-12-14 12:51:27,421 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 [2022-12-14 12:51:27,454 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:27,454 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 [2022-12-14 12:51:27,545 INFO L321 Elim1Store]: treesize reduction 106, result has 33.3 percent of original size [2022-12-14 12:51:27,546 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 [2022-12-14 12:51:27,639 INFO L321 Elim1Store]: treesize reduction 106, result has 33.3 percent of original size [2022-12-14 12:51:27,640 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 [2022-12-14 12:51:28,847 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 1 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:51:28,847 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:51:32,706 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 [2022-12-14 12:51:32,727 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:32,728 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 [2022-12-14 12:51:35,786 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:51:35,786 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788116580] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:51:35,786 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065463191] [2022-12-14 12:51:35,788 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:51:35,788 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:51:35,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:51:35,789 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:51:35,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:51:35,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:35,836 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:51:35,836 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 [2022-12-14 12:51:35,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:35,850 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 [2022-12-14 12:51:35,865 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:51:35,952 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 [2022-12-14 12:51:35,955 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 [2022-12-14 12:51:35,958 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 [2022-12-14 12:51:35,962 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 [2022-12-14 12:51:35,968 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 [2022-12-14 12:51:35,989 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:51:35,990 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 [2022-12-14 12:51:36,010 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:51:36,010 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 [2022-12-14 12:51:36,027 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:51:36,027 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 [2022-12-14 12:51:36,043 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 [2022-12-14 12:51:36,047 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 [2022-12-14 12:51:36,051 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 [2022-12-14 12:51:36,056 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 [2022-12-14 12:51:36,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,164 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 [2022-12-14 12:51:36,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,176 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 [2022-12-14 12:51:36,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,245 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 [2022-12-14 12:51:36,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,260 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 [2022-12-14 12:51:36,413 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 [2022-12-14 12:51:36,428 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 [2022-12-14 12:51:36,440 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 [2022-12-14 12:51:36,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,603 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 [2022-12-14 12:51:36,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:36,615 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 [2022-12-14 12:51:36,642 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:51:36,775 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:51:36,791 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:51:36,883 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 125 for LOIs [2022-12-14 12:51:37,146 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 [2022-12-14 12:51:37,150 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 [2022-12-14 12:51:37,158 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 [2022-12-14 12:51:37,162 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 [2022-12-14 12:51:37,169 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:51:52,594 WARN L233 SmtUtils]: Spent 8.21s 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) [2022-12-14 12:51:53,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3585#(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 [2022-12-14 12:51:53,242 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:51:53,242 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:51:53,242 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 22, 21] total 50 [2022-12-14 12:51:53,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006357338] [2022-12-14 12:51:53,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:51:53,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 12:51:53,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:51:53,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 12:51:53,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=4173, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 12:51:53,244 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) [2022-12-14 12:51:55,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:51:55,711 INFO L93 Difference]: Finished difference Result 116 states and 153 transitions. [2022-12-14 12:51:55,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 12:51:55,712 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 [2022-12-14 12:51:55,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:51:55,713 INFO L225 Difference]: With dead ends: 116 [2022-12-14 12:51:55,713 INFO L226 Difference]: Without dead ends: 77 [2022-12-14 12:51:55,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 63 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1597 ImplicationChecksByTransitivity, 19.6s TimeCoverageRelationStatistics Valid=339, Invalid=4917, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 12:51:55,715 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 67 mSDsluCounter, 651 mSDsCounter, 0 mSdLazyCounter, 1400 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 1412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 12:51:55,715 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 681 Invalid, 1412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1400 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 12:51:55,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-12-14 12:51:55,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 59. [2022-12-14 12:51:55,734 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) [2022-12-14 12:51:55,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 76 transitions. [2022-12-14 12:51:55,735 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 76 transitions. Word has length 40 [2022-12-14 12:51:55,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:51:55,735 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 76 transitions. [2022-12-14 12:51:55,735 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) [2022-12-14 12:51:55,735 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 76 transitions. [2022-12-14 12:51:55,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 12:51:55,736 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:51:55,736 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] [2022-12-14 12:51:55,742 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 12:51:55,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 12:51:55,938 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:51:55,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:51:55,939 INFO L85 PathProgramCache]: Analyzing trace with hash -2117284933, now seen corresponding path program 8 times [2022-12-14 12:51:55,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:51:55,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839923831] [2022-12-14 12:51:55,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:51:55,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:51:56,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:51:56,343 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 12:51:56,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:51:56,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839923831] [2022-12-14 12:51:56,343 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839923831] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:51:56,343 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805757173] [2022-12-14 12:51:56,343 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 12:51:56,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:51:56,344 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:51:56,344 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:51:56,345 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 12:51:57,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 12:51:57,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:51:57,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 98 conjunts are in the unsatisfiable core [2022-12-14 12:51:57,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:51:57,173 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 [2022-12-14 12:51:57,191 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 [2022-12-14 12:51:57,215 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:57,215 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 [2022-12-14 12:51:57,245 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:57,245 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 [2022-12-14 12:51:57,297 INFO L321 Elim1Store]: treesize reduction 70, result has 33.3 percent of original size [2022-12-14 12:51:57,298 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 [2022-12-14 12:51:57,336 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:57,336 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 [2022-12-14 12:51:57,390 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:51:57,391 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 [2022-12-14 12:51:57,481 INFO L321 Elim1Store]: treesize reduction 124, result has 33.3 percent of original size [2022-12-14 12:51:57,481 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 [2022-12-14 12:51:57,585 INFO L321 Elim1Store]: treesize reduction 180, result has 25.6 percent of original size [2022-12-14 12:51:57,585 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 [2022-12-14 12:51:57,714 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 12:51:57,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:51:57,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805757173] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:51:57,887 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [804349660] [2022-12-14 12:51:57,888 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:51:57,888 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:51:57,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:51:57,888 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:51:57,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:51:57,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:57,927 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-12-14 12:51:57,927 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 [2022-12-14 12:51:57,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:57,972 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:51:57,973 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 [2022-12-14 12:51:57,987 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:51:58,065 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 [2022-12-14 12:51:58,067 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 [2022-12-14 12:51:58,071 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 [2022-12-14 12:51:58,074 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 [2022-12-14 12:51:58,099 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:51:58,099 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 [2022-12-14 12:51:58,120 INFO L321 Elim1Store]: treesize reduction 15, result has 42.3 percent of original size [2022-12-14 12:51:58,120 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 [2022-12-14 12:51:58,138 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 12:51:58,138 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 [2022-12-14 12:51:58,150 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 [2022-12-14 12:51:58,158 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 [2022-12-14 12:51:58,162 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 [2022-12-14 12:51:58,166 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 [2022-12-14 12:51:58,170 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 [2022-12-14 12:51:58,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,261 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 [2022-12-14 12:51:58,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,270 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 [2022-12-14 12:51:58,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,334 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,334 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 [2022-12-14 12:51:58,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,343 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 [2022-12-14 12:51:58,441 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 517 treesize of output 461 [2022-12-14 12:51:58,451 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 [2022-12-14 12:51:58,458 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 445 treesize of output 389 [2022-12-14 12:51:58,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,575 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 [2022-12-14 12:51:58,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:51:58,585 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 [2022-12-14 12:51:58,608 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:51:58,719 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:51:58,732 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:51:58,825 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:51:59,070 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 [2022-12-14 12:51:59,074 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 [2022-12-14 12:51:59,078 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 [2022-12-14 12:51:59,083 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 [2022-12-14 12:51:59,091 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:52:05,305 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4033#(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 [2022-12-14 12:52:05,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:52:05,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-12-14 12:52:05,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16] total 26 [2022-12-14 12:52:05,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424144681] [2022-12-14 12:52:05,305 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-12-14 12:52:05,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 12:52:05,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:52:05,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 12:52:05,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1780, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 12:52:05,306 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) [2022-12-14 12:52:06,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:52:06,496 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2022-12-14 12:52:06,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 12:52:06,496 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 [2022-12-14 12:52:06,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:52:06,497 INFO L225 Difference]: With dead ends: 101 [2022-12-14 12:52:06,497 INFO L226 Difference]: Without dead ends: 60 [2022-12-14 12:52:06,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=171, Invalid=2799, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 12:52:06,498 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 9 mSDsluCounter, 342 mSDsCounter, 0 mSdLazyCounter, 509 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 12:52:06,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 366 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 509 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 12:52:06,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-12-14 12:52:06,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-12-14 12:52:06,509 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) [2022-12-14 12:52:06,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 77 transitions. [2022-12-14 12:52:06,509 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 77 transitions. Word has length 43 [2022-12-14 12:52:06,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:52:06,510 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 77 transitions. [2022-12-14 12:52:06,510 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) [2022-12-14 12:52:06,510 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 77 transitions. [2022-12-14 12:52:06,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 12:52:06,510 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:52:06,510 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] [2022-12-14 12:52:06,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 12:52:06,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:52:06,711 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:52:06,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:52:06,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1538816419, now seen corresponding path program 9 times [2022-12-14 12:52:06,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:52:06,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083955787] [2022-12-14 12:52:06,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:52:06,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:52:06,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:52:07,110 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 12:52:07,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:52:07,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083955787] [2022-12-14 12:52:07,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083955787] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:52:07,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710844204] [2022-12-14 12:52:07,111 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 12:52:07,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:52:07,111 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:52:07,112 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:52:07,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 12:52:07,450 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 12:52:07,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 12:52:07,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 99 conjunts are in the unsatisfiable core [2022-12-14 12:52:07,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:52:07,462 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 [2022-12-14 12:52:07,479 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 [2022-12-14 12:52:07,510 INFO L321 Elim1Store]: treesize reduction 34, result has 33.3 percent of original size [2022-12-14 12:52:07,511 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 [2022-12-14 12:52:07,540 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,540 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 [2022-12-14 12:52:07,572 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,572 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 [2022-12-14 12:52:07,606 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,607 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 [2022-12-14 12:52:07,654 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,654 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 [2022-12-14 12:52:07,725 INFO L321 Elim1Store]: treesize reduction 124, result has 33.3 percent of original size [2022-12-14 12:52:07,725 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 [2022-12-14 12:52:07,774 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,775 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 [2022-12-14 12:52:07,832 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:07,832 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 [2022-12-14 12:52:09,663 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:52:09,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:52:17,389 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 [2022-12-14 12:52:17,399 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:52:17,399 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 [2022-12-14 12:52:18,197 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 97 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:52:18,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710844204] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 12:52:18,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1900773064] [2022-12-14 12:52:18,198 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2022-12-14 12:52:18,198 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 12:52:18,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 12:52:18,198 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 12:52:18,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 12:52:18,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,235 INFO L321 Elim1Store]: treesize reduction 30, result has 48.3 percent of original size [2022-12-14 12:52:18,235 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 [2022-12-14 12:52:18,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,273 INFO L321 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2022-12-14 12:52:18,273 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 [2022-12-14 12:52:18,290 INFO L197 IcfgInterpreter]: Interpreting procedure aws_linked_list_node_reset with input of size 113 for LOIs [2022-12-14 12:52:18,387 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 [2022-12-14 12:52:18,391 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 [2022-12-14 12:52:18,397 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 [2022-12-14 12:52:18,400 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 [2022-12-14 12:52:18,407 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 [2022-12-14 12:52:18,411 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 [2022-12-14 12:52:18,415 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 [2022-12-14 12:52:18,419 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 [2022-12-14 12:52:18,429 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 [2022-12-14 12:52:18,432 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 [2022-12-14 12:52:18,435 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 [2022-12-14 12:52:18,438 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 [2022-12-14 12:52:18,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,542 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 44 treesize of output 16 [2022-12-14 12:52:18,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,549 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 [2022-12-14 12:52:18,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,616 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 [2022-12-14 12:52:18,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,625 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 [2022-12-14 12:52:18,733 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 [2022-12-14 12:52:18,744 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 [2022-12-14 12:52:18,753 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 [2022-12-14 12:52:18,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,901 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 [2022-12-14 12:52:18,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,908 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 12:52:18,909 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 [2022-12-14 12:52:18,934 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 123 for LOIs [2022-12-14 12:52:19,050 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 109 for LOIs [2022-12-14 12:52:19,066 INFO L197 IcfgInterpreter]: Interpreting procedure aws_is_mem_zeroed with input of size 70 for LOIs [2022-12-14 12:52:19,162 INFO L197 IcfgInterpreter]: Interpreting procedure #Ultimate.C_memset with input of size 127 for LOIs [2022-12-14 12:52:19,422 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 [2022-12-14 12:52:19,427 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 [2022-12-14 12:52:19,432 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 [2022-12-14 12:52:19,436 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 [2022-12-14 12:52:19,440 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 12:52:34,173 WARN L233 SmtUtils]: Spent 14.47s 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) [2022-12-14 12:52:45,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4629#(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 [2022-12-14 12:52:45,440 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 12:52:45,440 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 12:52:45,440 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 25, 24] total 58 [2022-12-14 12:52:45,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080503830] [2022-12-14 12:52:45,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 12:52:45,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 12:52:45,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:52:45,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 12:52:45,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=5224, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 12:52:45,442 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) [2022-12-14 12:52:47,920 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.29s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:49,301 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:50,491 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:51,990 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.42s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:53,443 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:54,899 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:56,727 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.78s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:58,231 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:52:59,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.43s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Real, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 12:53:01,912 WARN L539 Checker$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] [2022-12-14 12:53:05,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:53:05,597 INFO L93 Difference]: Finished difference Result 126 states and 168 transitions. [2022-12-14 12:53:05,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 12:53:05,597 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 [2022-12-14 12:53:05,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:53:05,598 INFO L225 Difference]: With dead ends: 126 [2022-12-14 12:53:05,598 INFO L226 Difference]: Without dead ends: 85 [2022-12-14 12:53:05,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=387, Invalid=5775, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 12:53:05,599 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 75 mSDsluCounter, 744 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 9 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 1712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1702 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2022-12-14 12:53:05,599 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 776 Invalid, 1712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1702 Invalid, 1 Unknown, 0 Unchecked, 19.3s Time] [2022-12-14 12:53:05,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-12-14 12:53:05,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 63. [2022-12-14 12:53:05,613 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) [2022-12-14 12:53:05,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 82 transitions. [2022-12-14 12:53:05,614 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 82 transitions. Word has length 44 [2022-12-14 12:53:05,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:53:05,614 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 82 transitions. [2022-12-14 12:53:05,614 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) [2022-12-14 12:53:05,614 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 82 transitions. [2022-12-14 12:53:05,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 12:53:05,615 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:53:05,615 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] [2022-12-14 12:53:05,621 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 12:53:05,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:53:05,816 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:53:05,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:53:05,817 INFO L85 PathProgramCache]: Analyzing trace with hash -668358389, now seen corresponding path program 1 times [2022-12-14 12:53:05,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:53:05,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591258098] [2022-12-14 12:53:05,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:53:05,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:53:05,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:53:05,968 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2022-12-14 12:53:05,968 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:53:05,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591258098] [2022-12-14 12:53:05,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591258098] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 12:53:05,968 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 12:53:05,968 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 12:53:05,968 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429672430] [2022-12-14 12:53:05,969 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 12:53:05,969 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 12:53:05,969 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 12:53:05,969 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 12:53:05,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-12-14 12:53:05,970 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) [2022-12-14 12:53:06,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 12:53:06,021 INFO L93 Difference]: Finished difference Result 72 states and 90 transitions. [2022-12-14 12:53:06,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 12:53:06,022 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 [2022-12-14 12:53:06,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 12:53:06,023 INFO L225 Difference]: With dead ends: 72 [2022-12-14 12:53:06,023 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 12:53:06,023 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 [2022-12-14 12:53:06,023 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 [2022-12-14 12:53:06,024 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] [2022-12-14 12:53:06,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 12:53:06,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-12-14 12:53:06,043 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) [2022-12-14 12:53:06,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 79 transitions. [2022-12-14 12:53:06,043 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 79 transitions. Word has length 48 [2022-12-14 12:53:06,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 12:53:06,043 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 79 transitions. [2022-12-14 12:53:06,043 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) [2022-12-14 12:53:06,044 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 79 transitions. [2022-12-14 12:53:06,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 12:53:06,044 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 12:53:06,044 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] [2022-12-14 12:53:06,044 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-12-14 12:53:06,044 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 12:53:06,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 12:53:06,046 INFO L85 PathProgramCache]: Analyzing trace with hash 1751523209, now seen corresponding path program 10 times [2022-12-14 12:53:06,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 12:53:06,046 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054275481] [2022-12-14 12:53:06,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 12:53:06,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 12:53:06,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:53:06,435 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-12-14 12:53:06,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 12:53:06,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054275481] [2022-12-14 12:53:06,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1054275481] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 12:53:06,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934724277] [2022-12-14 12:53:06,436 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 12:53:06,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 12:53:06,436 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 12:53:06,437 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 12:53:06,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a93fb18f-b29f-4f6a-a184-07d35df4af4b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 12:53:06,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 12:53:06,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 99 conjunts are in the unsatisfiable core [2022-12-14 12:53:06,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 12:53:06,884 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 [2022-12-14 12:53:06,901 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 [2022-12-14 12:53:06,925 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:53:06,925 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 [2022-12-14 12:53:06,963 INFO L321 Elim1Store]: treesize reduction 52, result has 33.3 percent of original size [2022-12-14 12:53:06,964 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 [2022-12-14 12:53:06,997 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:53:06,997 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 [2022-12-14 12:53:07,057 INFO L321 Elim1Store]: treesize reduction 88, result has 33.3 percent of original size [2022-12-14 12:53:07,057 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 [2022-12-14 12:53:07,126 INFO L321 Elim1Store]: treesize reduction 128, result has 25.6 percent of original size [2022-12-14 12:53:07,126 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 [2022-12-14 12:53:07,176 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:53:07,176 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 [2022-12-14 12:53:07,284 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-12-14 12:53:07,284 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 [2022-12-14 12:53:07,391 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-12-14 12:53:07,391 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 [2022-12-14 12:53:07,497 INFO L321 Elim1Store]: treesize reduction 142, result has 33.3 percent of original size [2022-12-14 12:53:07,497 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 [2022-12-14 12:53:09,370 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 3 proven. 119 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 12:53:09,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 12:54:35,486 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 [2022-12-14 12:54:35,537 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 12:54:35,539 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 [2022-12-14 12:54:43,941 WARN L233 SmtUtils]: Spent 8.40s 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) [2022-12-14 12:55:25,866 WARN L233 SmtUtils]: Spent 15.82s 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) [2022-12-14 12:55:50,777 WARN L233 SmtUtils]: Spent 12.09s 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) [2022-12-14 12:56:14,620 WARN L233 SmtUtils]: Spent 17.18s 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) [2022-12-14 13:00:07,318 WARN L233 SmtUtils]: Spent 9.86s 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) [2022-12-14 13:00:26,566 WARN L233 SmtUtils]: Spent 14.73s 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)