./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V --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 de3da06dbfc8734cb93dce42b312357899e8d9cc914b94ba94740650fa2d8258 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 01:56:54,510 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 01:56:54,513 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 01:56:54,572 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 01:56:54,572 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 01:56:54,576 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 01:56:54,578 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 01:56:54,582 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 01:56:54,586 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 01:56:54,592 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 01:56:54,593 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 01:56:54,595 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 01:56:54,596 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 01:56:54,598 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 01:56:54,600 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 01:56:54,605 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 01:56:54,607 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 01:56:54,608 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 01:56:54,611 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 01:56:54,618 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 01:56:54,620 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 01:56:54,622 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 01:56:54,626 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 01:56:54,627 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 01:56:54,636 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 01:56:54,636 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 01:56:54,637 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 01:56:54,639 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 01:56:54,640 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 01:56:54,641 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 01:56:54,642 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 01:56:54,642 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 01:56:54,644 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 01:56:54,646 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 01:56:54,647 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 01:56:54,647 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 01:56:54,648 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 01:56:54,648 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 01:56:54,649 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 01:56:54,650 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 01:56:54,650 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 01:56:54,652 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-23 01:56:54,696 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 01:56:54,696 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 01:56:54,697 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 01:56:54,697 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 01:56:54,698 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 01:56:54,704 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 01:56:54,704 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 01:56:54,705 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 01:56:54,705 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 01:56:54,705 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 01:56:54,706 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 01:56:54,706 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 01:56:54,707 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 01:56:54,707 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 01:56:54,707 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 01:56:54,707 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 01:56:54,708 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 01:56:54,708 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 01:56:54,709 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 01:56:54,709 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 01:56:54,709 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 01:56:54,709 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 01:56:54,710 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 01:56:54,710 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 01:56:54,710 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 01:56:54,710 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 01:56:54,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 01:56:54,712 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 01:56:54,712 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 01:56:54,713 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:56:54,713 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 01:56:54,713 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 01:56:54,714 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 01:56:54,714 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 01:56:54,714 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 01:56:54,714 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 01:56:54,714 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 01:56:54,715 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 01:56:54,715 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> de3da06dbfc8734cb93dce42b312357899e8d9cc914b94ba94740650fa2d8258 [2021-11-23 01:56:54,996 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 01:56:55,026 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 01:56:55,029 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 01:56:55,030 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 01:56:55,031 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 01:56:55,033 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i [2021-11-23 01:56:55,105 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/data/17d90d816/ca2d9eb7b7c04b6c8a3497cf0bebadd7/FLAG36aa58e0a [2021-11-23 01:56:55,973 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 01:56:55,973 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i [2021-11-23 01:56:56,028 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/data/17d90d816/ca2d9eb7b7c04b6c8a3497cf0bebadd7/FLAG36aa58e0a [2021-11-23 01:56:56,439 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/data/17d90d816/ca2d9eb7b7c04b6c8a3497cf0bebadd7 [2021-11-23 01:56:56,443 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 01:56:56,444 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 01:56:56,446 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 01:56:56,446 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 01:56:56,450 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 01:56:56,450 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:56:56" (1/1) ... [2021-11-23 01:56:56,452 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30eba520 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:56, skipping insertion in model container [2021-11-23 01:56:56,452 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 01:56:56" (1/1) ... [2021-11-23 01:56:56,459 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 01:56:56,585 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 01:56:56,867 WARN L230 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_cb13c797-474c-4365-8904-a2b81bc73010/sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i[4494,4507] [2021-11-23 01:56:56,874 WARN L230 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_cb13c797-474c-4365-8904-a2b81bc73010/sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i[4554,4567] [2021-11-23 01:56:57,911 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,912 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,912 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,913 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,915 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,934 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,939 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,942 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:57,943 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,330 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-23 01:56:58,332 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-23 01:56:58,333 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-23 01:56:58,335 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-23 01:56:58,336 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-23 01:56:58,337 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-23 01:56:58,338 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-23 01:56:58,339 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-23 01:56:58,340 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-23 01:56:58,340 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-23 01:56:58,525 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-23 01:56:58,550 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,550 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,662 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,671 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,741 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:56:58,788 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 01:56:58,816 WARN L230 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_cb13c797-474c-4365-8904-a2b81bc73010/sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i[4494,4507] [2021-11-23 01:56:58,817 WARN L230 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_cb13c797-474c-4365-8904-a2b81bc73010/sv-benchmarks/c/aws-c-common/aws_byte_buf_reserve_harness.i[4554,4567] [2021-11-23 01:56:58,876 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,877 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,877 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,877 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,879 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,898 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,898 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,900 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,900 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:58,955 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-23 01:56:58,956 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-23 01:56:58,957 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-23 01:56:58,958 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-23 01:56:58,959 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-23 01:56:58,959 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-23 01:56:58,960 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-23 01:56:58,967 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-23 01:56:58,969 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-23 01:56:58,971 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-23 01:56:59,001 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-23 01:56:59,019 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:59,020 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:59,077 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:59,078 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-23 01:56:59,157 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 01:56:59,415 INFO L208 MainTranslator]: Completed translation [2021-11-23 01:56:59,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59 WrapperNode [2021-11-23 01:56:59,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 01:56:59,437 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 01:56:59,449 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 01:56:59,450 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 01:56:59,457 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,602 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,720 INFO L137 Inliner]: procedures = 692, calls = 2621, calls flagged for inlining = 60, calls inlined = 10, statements flattened = 957 [2021-11-23 01:56:59,720 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 01:56:59,721 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 01:56:59,721 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 01:56:59,721 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 01:56:59,730 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,730 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,747 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,748 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,810 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,828 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,837 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,865 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 01:56:59,867 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 01:56:59,867 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 01:56:59,867 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 01:56:59,868 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (1/1) ... [2021-11-23 01:56:59,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 01:56:59,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:56:59,899 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 01:56:59,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 01:56:59,947 INFO L130 BoogieDeclarations]: Found specification of procedure aws_byte_buf_is_valid [2021-11-23 01:56:59,947 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_byte_buf_is_valid [2021-11-23 01:56:59,948 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 01:56:59,948 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_bool [2021-11-23 01:56:59,949 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_bool [2021-11-23 01:56:59,949 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 01:56:59,949 INFO L130 BoogieDeclarations]: Found specification of procedure aws_raise_error [2021-11-23 01:56:59,949 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_raise_error [2021-11-23 01:56:59,950 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 01:56:59,950 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 01:56:59,950 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 01:56:59,950 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 01:56:59,950 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 01:56:59,950 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 01:56:59,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 01:56:59,951 INFO L130 BoogieDeclarations]: Found specification of procedure bounded_malloc [2021-11-23 01:56:59,951 INFO L138 BoogieDeclarations]: Found implementation of procedure bounded_malloc [2021-11-23 01:56:59,951 INFO L130 BoogieDeclarations]: Found specification of procedure can_fail_realloc [2021-11-23 01:56:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure can_fail_realloc [2021-11-23 01:56:59,952 INFO L130 BoogieDeclarations]: Found specification of procedure aws_byte_buf_reserve [2021-11-23 01:56:59,953 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_byte_buf_reserve [2021-11-23 01:56:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure aws_mem_release [2021-11-23 01:56:59,953 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_mem_release [2021-11-23 01:56:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-23 01:56:59,953 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-23 01:56:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 01:56:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 01:56:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-23 01:56:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure can_fail_allocator [2021-11-23 01:56:59,955 INFO L138 BoogieDeclarations]: Found implementation of procedure can_fail_allocator [2021-11-23 01:56:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2021-11-23 01:56:59,955 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2021-11-23 01:56:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 01:56:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 01:57:00,240 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 01:57:00,242 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 01:57:01,460 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 01:57:01,663 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 01:57:01,664 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-23 01:57:01,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:01 BoogieIcfgContainer [2021-11-23 01:57:01,667 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 01:57:01,669 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 01:57:01,669 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 01:57:01,673 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 01:57:01,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 01:56:56" (1/3) ... [2021-11-23 01:57:01,676 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe5481a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:01, skipping insertion in model container [2021-11-23 01:57:01,676 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 01:56:59" (2/3) ... [2021-11-23 01:57:01,677 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fe5481a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 01:57:01, skipping insertion in model container [2021-11-23 01:57:01,677 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 01:57:01" (3/3) ... [2021-11-23 01:57:01,679 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_byte_buf_reserve_harness.i [2021-11-23 01:57:01,692 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 01:57:01,693 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 01:57:01,769 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 01:57:01,784 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 01:57:01,786 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 01:57:01,812 INFO L276 IsEmpty]: Start isEmpty. Operand has 116 states, 67 states have (on average 1.2537313432835822) internal successors, (84), 67 states have internal predecessors, (84), 37 states have call successors, (37), 11 states have call predecessors, (37), 11 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2021-11-23 01:57:01,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-23 01:57:01,819 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:01,820 INFO L514 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:01,820 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:01,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:01,827 INFO L85 PathProgramCache]: Analyzing trace with hash -355170412, now seen corresponding path program 1 times [2021-11-23 01:57:01,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:01,839 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464928623] [2021-11-23 01:57:01,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:01,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:02,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:02,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:02,477 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:02,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464928623] [2021-11-23 01:57:02,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464928623] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:02,484 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:02,484 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 01:57:02,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184434093] [2021-11-23 01:57:02,486 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:02,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 01:57:02,491 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:02,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 01:57:02,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 01:57:02,520 INFO L87 Difference]: Start difference. First operand has 116 states, 67 states have (on average 1.2537313432835822) internal successors, (84), 67 states have internal predecessors, (84), 37 states have call successors, (37), 11 states have call predecessors, (37), 11 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) Second operand has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 01:57:02,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:02,672 INFO L93 Difference]: Finished difference Result 215 states and 303 transitions. [2021-11-23 01:57:02,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 01:57:02,676 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 34 [2021-11-23 01:57:02,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:02,690 INFO L225 Difference]: With dead ends: 215 [2021-11-23 01:57:02,690 INFO L226 Difference]: Without dead ends: 112 [2021-11-23 01:57:02,696 INFO L932 BasicCegarLoop]: 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 [2021-11-23 01:57:02,706 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:02,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 138 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:02,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-23 01:57:02,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2021-11-23 01:57:02,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 64 states have internal predecessors, (74), 37 states have call successors, (37), 11 states have call predecessors, (37), 11 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-23 01:57:02,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 147 transitions. [2021-11-23 01:57:02,789 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 147 transitions. Word has length 34 [2021-11-23 01:57:02,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:02,791 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 147 transitions. [2021-11-23 01:57:02,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 9.0) internal successors, (18), 2 states have internal predecessors, (18), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2021-11-23 01:57:02,791 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 147 transitions. [2021-11-23 01:57:02,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 01:57:02,795 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:02,796 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:02,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 01:57:02,797 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:02,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:02,798 INFO L85 PathProgramCache]: Analyzing trace with hash -424375952, now seen corresponding path program 1 times [2021-11-23 01:57:02,798 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:02,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544019635] [2021-11-23 01:57:02,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:02,799 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:02,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:03,105 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:57:03,106 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:03,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544019635] [2021-11-23 01:57:03,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544019635] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:03,106 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:03,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 01:57:03,107 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336388147] [2021-11-23 01:57:03,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:03,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:57:03,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:03,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:57:03,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:03,110 INFO L87 Difference]: Start difference. First operand 112 states and 147 transitions. Second operand has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 01:57:03,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:03,282 INFO L93 Difference]: Finished difference Result 151 states and 192 transitions. [2021-11-23 01:57:03,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:57:03,283 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) Word has length 37 [2021-11-23 01:57:03,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:03,285 INFO L225 Difference]: With dead ends: 151 [2021-11-23 01:57:03,285 INFO L226 Difference]: Without dead ends: 116 [2021-11-23 01:57:03,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:03,287 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 0 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:03,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 644 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:03,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-11-23 01:57:03,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116. [2021-11-23 01:57:03,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 67 states have internal predecessors, (77), 37 states have call successors, (37), 11 states have call predecessors, (37), 12 states have return successors, (37), 37 states have call predecessors, (37), 36 states have call successors, (37) [2021-11-23 01:57:03,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 151 transitions. [2021-11-23 01:57:03,302 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 151 transitions. Word has length 37 [2021-11-23 01:57:03,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:03,303 INFO L470 AbstractCegarLoop]: Abstraction has 116 states and 151 transitions. [2021-11-23 01:57:03,303 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (7), 3 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-23 01:57:03,303 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 151 transitions. [2021-11-23 01:57:03,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 01:57:03,305 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:03,305 INFO L514 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:03,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 01:57:03,306 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:03,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:03,306 INFO L85 PathProgramCache]: Analyzing trace with hash -1641044390, now seen corresponding path program 1 times [2021-11-23 01:57:03,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:03,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790428987] [2021-11-23 01:57:03,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:03,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:05,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:06,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 01:57:06,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:06,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790428987] [2021-11-23 01:57:06,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790428987] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:06,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083773009] [2021-11-23 01:57:06,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:06,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:06,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:06,459 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:06,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 01:57:06,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:06,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 2422 conjuncts, 59 conjunts are in the unsatisfiable core [2021-11-23 01:57:07,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:07,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 01:57:07,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 01:57:15,468 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 01:57:15,468 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 01:57:15,468 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083773009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:15,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 01:57:15,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [15] total 26 [2021-11-23 01:57:15,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490742507] [2021-11-23 01:57:15,469 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:15,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 01:57:15,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:15,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 01:57:15,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=570, Unknown=0, NotChecked=0, Total=650 [2021-11-23 01:57:15,474 INFO L87 Difference]: Start difference. First operand 116 states and 151 transitions. Second operand has 17 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 01:57:16,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:16,410 INFO L93 Difference]: Finished difference Result 156 states and 198 transitions. [2021-11-23 01:57:16,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-23 01:57:16,411 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 40 [2021-11-23 01:57:16,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:16,413 INFO L225 Difference]: With dead ends: 156 [2021-11-23 01:57:16,414 INFO L226 Difference]: Without dead ends: 154 [2021-11-23 01:57:16,414 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=119, Invalid=937, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 01:57:16,416 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 63 mSDsluCounter, 998 mSDsCounter, 0 mSdLazyCounter, 672 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1073 SdHoareTripleChecker+Invalid, 1213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 672 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 496 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:16,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 1073 Invalid, 1213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 672 Invalid, 0 Unknown, 496 Unchecked, 0.7s Time] [2021-11-23 01:57:16,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-11-23 01:57:16,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-11-23 01:57:16,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 88 states have (on average 1.1590909090909092) internal successors, (102), 90 states have internal predecessors, (102), 45 states have call successors, (45), 15 states have call predecessors, (45), 19 states have return successors, (48), 47 states have call predecessors, (48), 44 states have call successors, (48) [2021-11-23 01:57:16,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 195 transitions. [2021-11-23 01:57:16,435 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 195 transitions. Word has length 40 [2021-11-23 01:57:16,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:16,436 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 195 transitions. [2021-11-23 01:57:16,436 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 10 states have (on average 2.3) internal successors, (23), 11 states have internal predecessors, (23), 7 states have call successors, (9), 5 states have call predecessors, (9), 6 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2021-11-23 01:57:16,436 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 195 transitions. [2021-11-23 01:57:16,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 01:57:16,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:16,438 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:16,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:16,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:16,664 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:16,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:16,665 INFO L85 PathProgramCache]: Analyzing trace with hash -1273911064, now seen corresponding path program 1 times [2021-11-23 01:57:16,665 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:16,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934536181] [2021-11-23 01:57:16,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:16,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:17,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:17,565 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:57:17,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:17,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934536181] [2021-11-23 01:57:17,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934536181] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:17,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:17,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 01:57:17,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783454710] [2021-11-23 01:57:17,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:17,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 01:57:17,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:17,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 01:57:17,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 01:57:17,568 INFO L87 Difference]: Start difference. First operand 153 states and 195 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 01:57:17,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:17,989 INFO L93 Difference]: Finished difference Result 312 states and 402 transitions. [2021-11-23 01:57:17,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 01:57:17,990 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 40 [2021-11-23 01:57:17,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:17,993 INFO L225 Difference]: With dead ends: 312 [2021-11-23 01:57:17,993 INFO L226 Difference]: Without dead ends: 184 [2021-11-23 01:57:17,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 01:57:17,995 INFO L933 BasicCegarLoop]: 133 mSDtfsCounter, 45 mSDsluCounter, 682 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:17,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 752 Invalid, 318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:57:17,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-11-23 01:57:18,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 167. [2021-11-23 01:57:18,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 96 states have (on average 1.1458333333333333) internal successors, (110), 99 states have internal predecessors, (110), 50 states have call successors, (50), 16 states have call predecessors, (50), 20 states have return successors, (53), 51 states have call predecessors, (53), 49 states have call successors, (53) [2021-11-23 01:57:18,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 213 transitions. [2021-11-23 01:57:18,018 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 213 transitions. Word has length 40 [2021-11-23 01:57:18,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:18,019 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 213 transitions. [2021-11-23 01:57:18,019 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 01:57:18,019 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 213 transitions. [2021-11-23 01:57:18,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 01:57:18,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:18,033 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:18,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 01:57:18,033 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:18,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:18,034 INFO L85 PathProgramCache]: Analyzing trace with hash 180781588, now seen corresponding path program 1 times [2021-11-23 01:57:18,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:18,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278835028] [2021-11-23 01:57:18,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:18,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:19,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:20,222 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:20,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:20,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278835028] [2021-11-23 01:57:20,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278835028] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:20,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087194933] [2021-11-23 01:57:20,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:20,223 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:20,224 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:20,243 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:20,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 01:57:20,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:20,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 2425 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-23 01:57:20,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:20,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 01:57:20,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 01:57:28,909 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 01:57:28,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 100 treesize of output 84 [2021-11-23 01:57:28,960 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 01:57:28,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 154 [2021-11-23 01:57:31,857 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 01:57:31,857 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 01:57:31,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087194933] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:31,857 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 01:57:31,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [17] total 29 [2021-11-23 01:57:31,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167446919] [2021-11-23 01:57:31,858 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:31,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 01:57:31,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:31,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 01:57:31,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2021-11-23 01:57:31,859 INFO L87 Difference]: Start difference. First operand 167 states and 213 transitions. Second operand has 17 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 01:57:32,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:32,256 INFO L93 Difference]: Finished difference Result 196 states and 246 transitions. [2021-11-23 01:57:32,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 01:57:32,257 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-23 01:57:32,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:32,259 INFO L225 Difference]: With dead ends: 196 [2021-11-23 01:57:32,260 INFO L226 Difference]: Without dead ends: 194 [2021-11-23 01:57:32,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 28 SyntacticMatches, 5 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=100, Invalid=892, Unknown=0, NotChecked=0, Total=992 [2021-11-23 01:57:32,261 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 37 mSDsluCounter, 989 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 1019 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:32,262 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 1019 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 347 Invalid, 0 Unknown, 79 Unchecked, 0.3s Time] [2021-11-23 01:57:32,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-23 01:57:32,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 175. [2021-11-23 01:57:32,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 104 states have internal predecessors, (115), 50 states have call successors, (50), 19 states have call predecessors, (50), 23 states have return successors, (53), 51 states have call predecessors, (53), 49 states have call successors, (53) [2021-11-23 01:57:32,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 218 transitions. [2021-11-23 01:57:32,283 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 218 transitions. Word has length 44 [2021-11-23 01:57:32,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:32,284 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 218 transitions. [2021-11-23 01:57:32,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (8), 6 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 01:57:32,284 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 218 transitions. [2021-11-23 01:57:32,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 01:57:32,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:32,286 INFO L514 BasicCegarLoop]: 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:32,322 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:32,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:32,500 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:32,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:32,501 INFO L85 PathProgramCache]: Analyzing trace with hash 255889020, now seen corresponding path program 1 times [2021-11-23 01:57:32,501 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:32,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242880133] [2021-11-23 01:57:32,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:32,501 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:32,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:32,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:32,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:32,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242880133] [2021-11-23 01:57:32,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [242880133] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:32,694 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:32,694 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 01:57:32,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931219188] [2021-11-23 01:57:32,695 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:32,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:57:32,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:32,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:57:32,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:32,696 INFO L87 Difference]: Start difference. First operand 175 states and 218 transitions. Second operand has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-23 01:57:32,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:32,822 INFO L93 Difference]: Finished difference Result 222 states and 270 transitions. [2021-11-23 01:57:32,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:57:32,823 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 1 states have call successors, (9) Word has length 46 [2021-11-23 01:57:32,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:32,825 INFO L225 Difference]: With dead ends: 222 [2021-11-23 01:57:32,825 INFO L226 Difference]: Without dead ends: 183 [2021-11-23 01:57:32,826 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:32,826 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 0 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 660 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:32,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 660 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:32,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-23 01:57:32,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 175. [2021-11-23 01:57:32,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 101 states have (on average 1.1386138613861385) internal successors, (115), 104 states have internal predecessors, (115), 50 states have call successors, (50), 19 states have call predecessors, (50), 23 states have return successors, (53), 51 states have call predecessors, (53), 49 states have call successors, (53) [2021-11-23 01:57:32,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 218 transitions. [2021-11-23 01:57:32,844 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 218 transitions. Word has length 46 [2021-11-23 01:57:32,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:32,845 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 218 transitions. [2021-11-23 01:57:32,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.0) internal successors, (25), 5 states have internal predecessors, (25), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (9), 3 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-23 01:57:32,845 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 218 transitions. [2021-11-23 01:57:32,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 01:57:32,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:32,846 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:32,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 01:57:32,847 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:32,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:32,847 INFO L85 PathProgramCache]: Analyzing trace with hash -452361234, now seen corresponding path program 1 times [2021-11-23 01:57:32,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:32,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [759597178] [2021-11-23 01:57:32,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:32,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:33,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:33,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:33,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:33,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [759597178] [2021-11-23 01:57:33,247 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [759597178] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:33,247 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:33,247 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 01:57:33,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915099643] [2021-11-23 01:57:33,248 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:33,248 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:57:33,248 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:33,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:57:33,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 01:57:33,249 INFO L87 Difference]: Start difference. First operand 175 states and 218 transitions. Second operand has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 01:57:33,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:33,753 INFO L93 Difference]: Finished difference Result 194 states and 241 transitions. [2021-11-23 01:57:33,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 01:57:33,753 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 46 [2021-11-23 01:57:33,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:33,755 INFO L225 Difference]: With dead ends: 194 [2021-11-23 01:57:33,755 INFO L226 Difference]: Without dead ends: 192 [2021-11-23 01:57:33,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-23 01:57:33,756 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 59 mSDsluCounter, 383 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:33,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 477 Invalid, 468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 01:57:33,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-11-23 01:57:33,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 181. [2021-11-23 01:57:33,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 105 states have (on average 1.1333333333333333) internal successors, (119), 108 states have internal predecessors, (119), 51 states have call successors, (51), 20 states have call predecessors, (51), 24 states have return successors, (54), 52 states have call predecessors, (54), 50 states have call successors, (54) [2021-11-23 01:57:33,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 224 transitions. [2021-11-23 01:57:33,774 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 224 transitions. Word has length 46 [2021-11-23 01:57:33,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:33,774 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 224 transitions. [2021-11-23 01:57:33,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.166666666666667) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 01:57:33,775 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 224 transitions. [2021-11-23 01:57:33,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 01:57:33,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:33,776 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:33,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 01:57:33,777 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:33,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:33,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1055566720, now seen corresponding path program 1 times [2021-11-23 01:57:33,777 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:33,778 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71672228] [2021-11-23 01:57:33,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:33,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:33,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:34,025 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:57:34,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:34,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71672228] [2021-11-23 01:57:34,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71672228] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:34,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:34,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 01:57:34,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95220209] [2021-11-23 01:57:34,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:34,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 01:57:34,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:34,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 01:57:34,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 01:57:34,029 INFO L87 Difference]: Start difference. First operand 181 states and 224 transitions. Second operand has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 01:57:34,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:34,577 INFO L93 Difference]: Finished difference Result 198 states and 244 transitions. [2021-11-23 01:57:34,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 01:57:34,578 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 52 [2021-11-23 01:57:34,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:34,580 INFO L225 Difference]: With dead ends: 198 [2021-11-23 01:57:34,580 INFO L226 Difference]: Without dead ends: 196 [2021-11-23 01:57:34,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-11-23 01:57:34,581 INFO L933 BasicCegarLoop]: 109 mSDtfsCounter, 58 mSDsluCounter, 372 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:34,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 467 Invalid, 478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 01:57:34,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-23 01:57:34,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 187. [2021-11-23 01:57:34,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 109 states have (on average 1.128440366972477) internal successors, (123), 112 states have internal predecessors, (123), 52 states have call successors, (52), 21 states have call predecessors, (52), 25 states have return successors, (55), 53 states have call predecessors, (55), 51 states have call successors, (55) [2021-11-23 01:57:34,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 230 transitions. [2021-11-23 01:57:34,599 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 230 transitions. Word has length 52 [2021-11-23 01:57:34,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:34,599 INFO L470 AbstractCegarLoop]: Abstraction has 187 states and 230 transitions. [2021-11-23 01:57:34,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 4 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 01:57:34,600 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 230 transitions. [2021-11-23 01:57:34,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 01:57:34,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:34,601 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:34,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 01:57:34,601 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:34,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:34,602 INFO L85 PathProgramCache]: Analyzing trace with hash -501670539, now seen corresponding path program 1 times [2021-11-23 01:57:34,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:34,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783951117] [2021-11-23 01:57:34,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:34,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:36,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:36,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 01:57:36,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:36,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783951117] [2021-11-23 01:57:36,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783951117] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:36,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [39760830] [2021-11-23 01:57:36,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:36,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:36,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:36,936 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:36,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 01:57:37,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:37,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 2445 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-23 01:57:37,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:37,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 01:57:37,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 19 treesize of output 11 [2021-11-23 01:57:37,980 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 01:57:37,980 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 01:57:37,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [39760830] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:37,981 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 01:57:37,981 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [19] total 28 [2021-11-23 01:57:37,981 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354518107] [2021-11-23 01:57:37,981 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:37,983 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 01:57:37,983 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:37,983 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 01:57:37,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=669, Unknown=0, NotChecked=0, Total=756 [2021-11-23 01:57:37,985 INFO L87 Difference]: Start difference. First operand 187 states and 230 transitions. Second operand has 13 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-23 01:57:39,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:39,053 INFO L93 Difference]: Finished difference Result 208 states and 257 transitions. [2021-11-23 01:57:39,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 01:57:39,053 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) Word has length 54 [2021-11-23 01:57:39,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:39,056 INFO L225 Difference]: With dead ends: 208 [2021-11-23 01:57:39,056 INFO L226 Difference]: Without dead ends: 206 [2021-11-23 01:57:39,057 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 48 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 263 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=126, Invalid=996, Unknown=0, NotChecked=0, Total=1122 [2021-11-23 01:57:39,058 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 101 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 1013 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 744 SdHoareTripleChecker+Invalid, 1101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 1013 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:39,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 744 Invalid, 1101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 1013 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 01:57:39,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-23 01:57:39,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 191. [2021-11-23 01:57:39,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 112 states have (on average 1.125) internal successors, (126), 115 states have internal predecessors, (126), 52 states have call successors, (52), 22 states have call predecessors, (52), 26 states have return successors, (55), 53 states have call predecessors, (55), 51 states have call successors, (55) [2021-11-23 01:57:39,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 233 transitions. [2021-11-23 01:57:39,083 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 233 transitions. Word has length 54 [2021-11-23 01:57:39,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:39,084 INFO L470 AbstractCegarLoop]: Abstraction has 191 states and 233 transitions. [2021-11-23 01:57:39,084 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.727272727272727) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2021-11-23 01:57:39,085 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 233 transitions. [2021-11-23 01:57:39,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 01:57:39,087 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:39,087 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:39,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 01:57:39,304 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:39,304 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:39,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:39,305 INFO L85 PathProgramCache]: Analyzing trace with hash -1986068748, now seen corresponding path program 1 times [2021-11-23 01:57:39,305 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:39,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326452610] [2021-11-23 01:57:39,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:39,305 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:39,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:39,805 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-23 01:57:39,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:39,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326452610] [2021-11-23 01:57:39,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326452610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:39,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:39,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-23 01:57:39,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677973581] [2021-11-23 01:57:39,806 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:39,806 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 01:57:39,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:39,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 01:57:39,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 01:57:39,807 INFO L87 Difference]: Start difference. First operand 191 states and 233 transitions. Second operand has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 01:57:40,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:40,478 INFO L93 Difference]: Finished difference Result 206 states and 250 transitions. [2021-11-23 01:57:40,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 01:57:40,478 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 59 [2021-11-23 01:57:40,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:40,480 INFO L225 Difference]: With dead ends: 206 [2021-11-23 01:57:40,480 INFO L226 Difference]: Without dead ends: 204 [2021-11-23 01:57:40,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 01:57:40,481 INFO L933 BasicCegarLoop]: 107 mSDtfsCounter, 62 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:40,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 499 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 01:57:40,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-11-23 01:57:40,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 198. [2021-11-23 01:57:40,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 117 states have (on average 1.1196581196581197) internal successors, (131), 120 states have internal predecessors, (131), 53 states have call successors, (53), 23 states have call predecessors, (53), 27 states have return successors, (56), 54 states have call predecessors, (56), 52 states have call successors, (56) [2021-11-23 01:57:40,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 240 transitions. [2021-11-23 01:57:40,499 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 240 transitions. Word has length 59 [2021-11-23 01:57:40,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:40,499 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 240 transitions. [2021-11-23 01:57:40,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 4.0) internal successors, (28), 7 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 01:57:40,500 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 240 transitions. [2021-11-23 01:57:40,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 01:57:40,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:40,501 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:40,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 01:57:40,501 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:40,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:40,502 INFO L85 PathProgramCache]: Analyzing trace with hash 322424277, now seen corresponding path program 1 times [2021-11-23 01:57:40,502 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:40,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765394456] [2021-11-23 01:57:40,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:40,503 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:41,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:41,991 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-23 01:57:41,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:41,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765394456] [2021-11-23 01:57:41,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765394456] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:41,992 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:41,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-11-23 01:57:41,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824054308] [2021-11-23 01:57:41,992 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:41,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 01:57:41,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:41,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 01:57:41,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-23 01:57:41,994 INFO L87 Difference]: Start difference. First operand 198 states and 240 transitions. Second operand has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-23 01:57:43,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:43,009 INFO L93 Difference]: Finished difference Result 221 states and 269 transitions. [2021-11-23 01:57:43,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 01:57:43,009 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) Word has length 64 [2021-11-23 01:57:43,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:43,011 INFO L225 Difference]: With dead ends: 221 [2021-11-23 01:57:43,011 INFO L226 Difference]: Without dead ends: 219 [2021-11-23 01:57:43,011 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-23 01:57:43,012 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 85 mSDsluCounter, 992 mSDsCounter, 0 mSdLazyCounter, 1047 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 124 SdHoareTripleChecker+Valid, 1102 SdHoareTripleChecker+Invalid, 1110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:43,013 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [124 Valid, 1102 Invalid, 1110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1047 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 01:57:43,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-11-23 01:57:43,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 202. [2021-11-23 01:57:43,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 120 states have (on average 1.1166666666666667) internal successors, (134), 123 states have internal predecessors, (134), 53 states have call successors, (53), 24 states have call predecessors, (53), 28 states have return successors, (56), 54 states have call predecessors, (56), 52 states have call successors, (56) [2021-11-23 01:57:43,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 243 transitions. [2021-11-23 01:57:43,031 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 243 transitions. Word has length 64 [2021-11-23 01:57:43,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:43,031 INFO L470 AbstractCegarLoop]: Abstraction has 202 states and 243 transitions. [2021-11-23 01:57:43,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 7 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 7 states have call predecessors, (12), 6 states have call successors, (12) [2021-11-23 01:57:43,032 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 243 transitions. [2021-11-23 01:57:43,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 01:57:43,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:43,033 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:43,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 01:57:43,034 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:43,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:43,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1272784373, now seen corresponding path program 1 times [2021-11-23 01:57:43,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:43,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509511880] [2021-11-23 01:57:43,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:43,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:43,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:43,185 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 01:57:43,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:43,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509511880] [2021-11-23 01:57:43,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509511880] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:43,186 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:43,186 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 01:57:43,187 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407233776] [2021-11-23 01:57:43,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:43,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 01:57:43,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:43,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 01:57:43,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:57:43,188 INFO L87 Difference]: Start difference. First operand 202 states and 243 transitions. Second operand has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-23 01:57:43,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:43,308 INFO L93 Difference]: Finished difference Result 271 states and 329 transitions. [2021-11-23 01:57:43,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 01:57:43,309 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) Word has length 66 [2021-11-23 01:57:43,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:43,312 INFO L225 Difference]: With dead ends: 271 [2021-11-23 01:57:43,312 INFO L226 Difference]: Without dead ends: 220 [2021-11-23 01:57:43,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 01:57:43,313 INFO L933 BasicCegarLoop]: 146 mSDtfsCounter, 8 mSDsluCounter, 462 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:43,314 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 568 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:43,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-23 01:57:43,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 206. [2021-11-23 01:57:43,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 123 states have (on average 1.113821138211382) internal successors, (137), 126 states have internal predecessors, (137), 53 states have call successors, (53), 24 states have call predecessors, (53), 29 states have return successors, (57), 55 states have call predecessors, (57), 52 states have call successors, (57) [2021-11-23 01:57:43,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 247 transitions. [2021-11-23 01:57:43,335 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 247 transitions. Word has length 66 [2021-11-23 01:57:43,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:43,339 INFO L470 AbstractCegarLoop]: Abstraction has 206 states and 247 transitions. [2021-11-23 01:57:43,339 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.8) internal successors, (34), 4 states have internal predecessors, (34), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 3 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-23 01:57:43,339 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 247 transitions. [2021-11-23 01:57:43,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-23 01:57:43,347 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:43,348 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:43,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 01:57:43,348 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:43,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:43,349 INFO L85 PathProgramCache]: Analyzing trace with hash -1331017075, now seen corresponding path program 1 times [2021-11-23 01:57:43,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:43,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560441248] [2021-11-23 01:57:43,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:43,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:43,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:43,654 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-23 01:57:43,654 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:43,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560441248] [2021-11-23 01:57:43,655 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560441248] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:43,655 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:43,655 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 01:57:43,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802840661] [2021-11-23 01:57:43,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:43,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 01:57:43,659 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:43,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 01:57:43,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:57:43,659 INFO L87 Difference]: Start difference. First operand 206 states and 247 transitions. Second operand has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 3 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 01:57:43,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:43,772 INFO L93 Difference]: Finished difference Result 259 states and 311 transitions. [2021-11-23 01:57:43,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 01:57:43,773 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 3 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 71 [2021-11-23 01:57:43,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:43,775 INFO L225 Difference]: With dead ends: 259 [2021-11-23 01:57:43,775 INFO L226 Difference]: Without dead ends: 200 [2021-11-23 01:57:43,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 01:57:43,778 INFO L933 BasicCegarLoop]: 123 mSDtfsCounter, 11 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:43,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 223 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:43,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-23 01:57:43,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 198. [2021-11-23 01:57:43,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 119 states have (on average 1.1092436974789917) internal successors, (132), 122 states have internal predecessors, (132), 50 states have call successors, (50), 23 states have call predecessors, (50), 28 states have return successors, (54), 52 states have call predecessors, (54), 49 states have call successors, (54) [2021-11-23 01:57:43,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 236 transitions. [2021-11-23 01:57:43,797 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 236 transitions. Word has length 71 [2021-11-23 01:57:43,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:43,798 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 236 transitions. [2021-11-23 01:57:43,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.0) internal successors, (33), 3 states have internal predecessors, (33), 3 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-23 01:57:43,799 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 236 transitions. [2021-11-23 01:57:43,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 01:57:43,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:43,800 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:43,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 01:57:43,801 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:43,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:43,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1772650051, now seen corresponding path program 1 times [2021-11-23 01:57:43,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:43,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968139954] [2021-11-23 01:57:43,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:43,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:43,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:43,951 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 01:57:43,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:43,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968139954] [2021-11-23 01:57:43,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968139954] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 01:57:43,952 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 01:57:43,952 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 01:57:43,952 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803100910] [2021-11-23 01:57:43,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 01:57:43,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 01:57:43,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 01:57:43,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 01:57:43,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 01:57:43,954 INFO L87 Difference]: Start difference. First operand 198 states and 236 transitions. Second operand has 6 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 01:57:44,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 01:57:44,084 INFO L93 Difference]: Finished difference Result 249 states and 298 transitions. [2021-11-23 01:57:44,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 01:57:44,085 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 2 states have call successors, (13) Word has length 70 [2021-11-23 01:57:44,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 01:57:44,087 INFO L225 Difference]: With dead ends: 249 [2021-11-23 01:57:44,088 INFO L226 Difference]: Without dead ends: 207 [2021-11-23 01:57:44,088 INFO L932 BasicCegarLoop]: 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 [2021-11-23 01:57:44,089 INFO L933 BasicCegarLoop]: 129 mSDtfsCounter, 3 mSDsluCounter, 555 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 633 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 01:57:44,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 633 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 01:57:44,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-11-23 01:57:44,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 200. [2021-11-23 01:57:44,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 121 states have (on average 1.0991735537190082) internal successors, (133), 124 states have internal predecessors, (133), 50 states have call successors, (50), 23 states have call predecessors, (50), 28 states have return successors, (54), 52 states have call predecessors, (54), 49 states have call successors, (54) [2021-11-23 01:57:44,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 237 transitions. [2021-11-23 01:57:44,110 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 237 transitions. Word has length 70 [2021-11-23 01:57:44,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 01:57:44,110 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 237 transitions. [2021-11-23 01:57:44,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 2 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 3 states have call predecessors, (13), 2 states have call successors, (13) [2021-11-23 01:57:44,111 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 237 transitions. [2021-11-23 01:57:44,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 01:57:44,112 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 01:57:44,112 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 01:57:44,112 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 01:57:44,112 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 01:57:44,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 01:57:44,113 INFO L85 PathProgramCache]: Analyzing trace with hash -162484669, now seen corresponding path program 1 times [2021-11-23 01:57:44,113 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 01:57:44,114 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456092821] [2021-11-23 01:57:44,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:44,114 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 01:57:45,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:46,874 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-23 01:57:46,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 01:57:46,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456092821] [2021-11-23 01:57:46,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456092821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 01:57:46,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409438589] [2021-11-23 01:57:46,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 01:57:46,876 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 01:57:46,876 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 01:57:46,877 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 01:57:46,878 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb13c797-474c-4365-8904-a2b81bc73010/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 01:57:47,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 01:57:47,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 2564 conjuncts, 105 conjunts are in the unsatisfiable core [2021-11-23 01:57:47,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 01:57:47,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2021-11-23 01:57:47,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-23 01:57:52,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing 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 31 treesize of output 19 [2021-11-23 01:57:56,672 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 01:57:56,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 01:57:58,922 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 76449 disjunctions. This might take some time... [2021-11-23 02:05:12,886 INFO L192 XnfTransformerHelper]: Simplified to conjuction of 76449 disjunctions.