./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7 --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 76206b4f7fb4016a4087a30dbd51e90ef533ed916c2eae20331e23ac9a9e91be --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 17:48:13,673 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 17:48:13,676 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 17:48:13,734 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 17:48:13,735 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 17:48:13,739 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 17:48:13,741 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 17:48:13,746 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 17:48:13,749 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 17:48:13,755 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 17:48:13,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 17:48:13,758 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 17:48:13,759 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 17:48:13,761 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 17:48:13,764 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 17:48:13,769 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 17:48:13,771 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 17:48:13,772 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 17:48:13,774 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 17:48:13,783 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 17:48:13,785 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 17:48:13,786 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 17:48:13,790 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 17:48:13,791 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 17:48:13,800 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 17:48:13,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 17:48:13,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 17:48:13,803 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 17:48:13,804 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 17:48:13,806 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 17:48:13,806 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 17:48:13,807 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 17:48:13,810 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 17:48:13,811 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 17:48:13,813 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 17:48:13,813 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 17:48:13,814 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 17:48:13,815 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 17:48:13,815 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 17:48:13,816 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 17:48:13,817 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 17:48:13,818 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-25 17:48:13,848 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 17:48:13,848 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 17:48:13,849 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 17:48:13,849 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 17:48:13,850 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 17:48:13,850 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 17:48:13,851 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 17:48:13,851 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 17:48:13,851 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 17:48:13,852 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 17:48:13,853 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 17:48:13,853 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 17:48:13,853 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 17:48:13,854 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 17:48:13,854 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 17:48:13,854 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 17:48:13,854 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 17:48:13,855 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 17:48:13,855 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 17:48:13,856 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 17:48:13,856 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 17:48:13,856 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 17:48:13,857 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 17:48:13,857 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 17:48:13,857 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 17:48:13,857 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 17:48:13,859 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 17:48:13,859 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 17:48:13,859 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 17:48:13,859 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:48:13,859 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 17:48:13,860 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 17:48:13,861 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_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 76206b4f7fb4016a4087a30dbd51e90ef533ed916c2eae20331e23ac9a9e91be [2021-11-25 17:48:14,205 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 17:48:14,231 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 17:48:14,234 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 17:48:14,236 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 17:48:14,237 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 17:48:14,238 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i [2021-11-25 17:48:14,319 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/data/f9acc51c1/31cb8679ff7b43d58cfaffd9a36664c8/FLAG30058f0a5 [2021-11-25 17:48:15,257 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 17:48:15,260 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i [2021-11-25 17:48:15,312 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/data/f9acc51c1/31cb8679ff7b43d58cfaffd9a36664c8/FLAG30058f0a5 [2021-11-25 17:48:15,736 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/data/f9acc51c1/31cb8679ff7b43d58cfaffd9a36664c8 [2021-11-25 17:48:15,739 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 17:48:15,749 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 17:48:15,768 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 17:48:15,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 17:48:15,772 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 17:48:15,773 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:48:15" (1/1) ... [2021-11-25 17:48:15,774 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a22bec5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:15, skipping insertion in model container [2021-11-25 17:48:15,774 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 05:48:15" (1/1) ... [2021-11-25 17:48:15,782 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 17:48:15,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 17:48:16,252 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_7138095b-064c-4003-bde5-3485d9a7efa1/sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i[4494,4507] [2021-11-25 17:48:16,260 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_7138095b-064c-4003-bde5-3485d9a7efa1/sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i[4554,4567] [2021-11-25 17:48:17,445 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,446 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,446 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,447 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,449 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,465 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,465 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,468 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,468 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,471 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,472 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,473 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:17,473 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,157 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:48:18,159 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:48:18,163 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:48:18,171 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:48:18,172 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:48:18,173 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:48:18,174 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:48:18,175 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:48:18,183 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:48:18,184 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:48:18,403 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-25 17:48:18,854 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,855 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,924 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,940 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,949 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,950 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,983 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,985 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,986 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,986 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,987 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:18,987 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,003 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,082 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:48:19,119 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 17:48:19,134 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_7138095b-064c-4003-bde5-3485d9a7efa1/sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i[4494,4507] [2021-11-25 17:48:19,135 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_7138095b-064c-4003-bde5-3485d9a7efa1/sv-benchmarks/c/aws-c-common/aws_hash_table_clear_harness.i[4554,4567] [2021-11-25 17:48:19,174 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,175 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,176 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,176 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,177 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,184 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,184 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,186 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,187 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,188 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,189 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,189 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,224 WARN L610 FunctionHandler]: implicit declaration of function __atomic_load_n [2021-11-25 17:48:19,225 WARN L610 FunctionHandler]: implicit declaration of function __atomic_store_n [2021-11-25 17:48:19,226 WARN L610 FunctionHandler]: implicit declaration of function __atomic_exchange_n [2021-11-25 17:48:19,227 WARN L610 FunctionHandler]: implicit declaration of function __atomic_compare_exchange_n [2021-11-25 17:48:19,228 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_add [2021-11-25 17:48:19,229 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_sub [2021-11-25 17:48:19,230 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_or [2021-11-25 17:48:19,230 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_and [2021-11-25 17:48:19,231 WARN L610 FunctionHandler]: implicit declaration of function __atomic_fetch_xor [2021-11-25 17:48:19,231 WARN L610 FunctionHandler]: implicit declaration of function __atomic_thread_fence [2021-11-25 17:48:19,252 WARN L610 FunctionHandler]: implicit declaration of function __builtin_va_copy [2021-11-25 17:48:19,378 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,379 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,389 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,390 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,393 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,394 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,410 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,411 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,412 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,412 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,413 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,414 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,414 WARN L1533 CHandler]: Possible shadowing of function index [2021-11-25 17:48:19,441 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 17:48:19,809 INFO L208 MainTranslator]: Completed translation [2021-11-25 17:48:19,809 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19 WrapperNode [2021-11-25 17:48:19,810 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 17:48:19,811 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 17:48:19,811 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 17:48:19,811 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 17:48:19,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,028 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,179 INFO L137 Inliner]: procedures = 775, calls = 2440, calls flagged for inlining = 68, calls inlined = 13, statements flattened = 620 [2021-11-25 17:48:20,180 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 17:48:20,181 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 17:48:20,182 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 17:48:20,182 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 17:48:20,192 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,192 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,233 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,317 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,339 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,350 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 17:48:20,362 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 17:48:20,362 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 17:48:20,362 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 17:48:20,363 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (1/1) ... [2021-11-25 17:48:20,372 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 17:48:20,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:20,401 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 17:48:20,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 17:48:20,453 INFO L130 BoogieDeclarations]: Found specification of procedure memset_override_0_impl [2021-11-25 17:48:20,454 INFO L138 BoogieDeclarations]: Found implementation of procedure memset_override_0_impl [2021-11-25 17:48:20,454 INFO L130 BoogieDeclarations]: Found specification of procedure read~real [2021-11-25 17:48:20,454 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_bool [2021-11-25 17:48:20,454 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_bool [2021-11-25 17:48:20,454 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 17:48:20,455 INFO L130 BoogieDeclarations]: Found specification of procedure aws_raise_error [2021-11-25 17:48:20,455 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_raise_error [2021-11-25 17:48:20,455 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-25 17:48:20,456 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-25 17:48:20,456 INFO L130 BoogieDeclarations]: Found specification of procedure hash_table_state_is_valid [2021-11-25 17:48:20,456 INFO L138 BoogieDeclarations]: Found implementation of procedure hash_table_state_is_valid [2021-11-25 17:48:20,457 INFO L130 BoogieDeclarations]: Found specification of procedure aws_hash_table_clear [2021-11-25 17:48:20,457 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_hash_table_clear [2021-11-25 17:48:20,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-25 17:48:20,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 17:48:20,458 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-25 17:48:20,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 17:48:20,458 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 17:48:20,459 INFO L130 BoogieDeclarations]: Found specification of procedure bounded_malloc [2021-11-25 17:48:20,459 INFO L138 BoogieDeclarations]: Found implementation of procedure bounded_malloc [2021-11-25 17:48:20,459 INFO L130 BoogieDeclarations]: Found specification of procedure aws_mul_size_checked [2021-11-25 17:48:20,460 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_mul_size_checked [2021-11-25 17:48:20,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 17:48:20,460 INFO L130 BoogieDeclarations]: Found specification of procedure __CPROVER_overflow_plus [2021-11-25 17:48:20,460 INFO L138 BoogieDeclarations]: Found implementation of procedure __CPROVER_overflow_plus [2021-11-25 17:48:20,460 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-25 17:48:20,460 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_uint64_t [2021-11-25 17:48:20,461 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_uint64_t [2021-11-25 17:48:20,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 17:48:20,461 INFO L130 BoogieDeclarations]: Found specification of procedure my_memset [2021-11-25 17:48:20,462 INFO L138 BoogieDeclarations]: Found implementation of procedure my_memset [2021-11-25 17:48:20,462 INFO L130 BoogieDeclarations]: Found specification of procedure aws_is_power_of_two [2021-11-25 17:48:20,462 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_is_power_of_two [2021-11-25 17:48:20,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 17:48:20,463 INFO L130 BoogieDeclarations]: Found specification of procedure hash_table_state_required_bytes [2021-11-25 17:48:20,466 INFO L138 BoogieDeclarations]: Found implementation of procedure hash_table_state_required_bytes [2021-11-25 17:48:20,466 INFO L130 BoogieDeclarations]: Found specification of procedure ##fun~$Pointer$~TO~VOID [2021-11-25 17:48:20,467 INFO L138 BoogieDeclarations]: Found implementation of procedure ##fun~$Pointer$~TO~VOID [2021-11-25 17:48:20,467 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-25 17:48:20,467 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-25 17:48:20,468 INFO L130 BoogieDeclarations]: Found specification of procedure aws_hash_table_is_valid [2021-11-25 17:48:20,468 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_hash_table_is_valid [2021-11-25 17:48:20,468 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-25 17:48:20,468 INFO L130 BoogieDeclarations]: Found specification of procedure __CPROVER_overflow_mult [2021-11-25 17:48:20,476 INFO L138 BoogieDeclarations]: Found implementation of procedure __CPROVER_overflow_mult [2021-11-25 17:48:20,476 INFO L130 BoogieDeclarations]: Found specification of procedure aws_add_size_checked [2021-11-25 17:48:20,476 INFO L138 BoogieDeclarations]: Found implementation of procedure aws_add_size_checked [2021-11-25 17:48:20,476 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 17:48:20,897 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 17:48:20,900 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 17:48:22,159 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 17:48:22,282 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 17:48:22,282 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 17:48:22,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:48:22 BoogieIcfgContainer [2021-11-25 17:48:22,286 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 17:48:22,288 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 17:48:22,288 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 17:48:22,292 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 17:48:22,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 05:48:15" (1/3) ... [2021-11-25 17:48:22,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@362bb8d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:48:22, skipping insertion in model container [2021-11-25 17:48:22,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 05:48:19" (2/3) ... [2021-11-25 17:48:22,294 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@362bb8d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 05:48:22, skipping insertion in model container [2021-11-25 17:48:22,294 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 05:48:22" (3/3) ... [2021-11-25 17:48:22,295 INFO L111 eAbstractionObserver]: Analyzing ICFG aws_hash_table_clear_harness.i [2021-11-25 17:48:22,302 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 17:48:22,302 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 17:48:22,363 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 17:48:22,377 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 [2021-11-25 17:48:22,378 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 17:48:22,406 INFO L276 IsEmpty]: Start isEmpty. Operand has 136 states, 75 states have (on average 1.2) internal successors, (90), 76 states have internal predecessors, (90), 41 states have call successors, (41), 18 states have call predecessors, (41), 18 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) [2021-11-25 17:48:22,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-25 17:48:22,420 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:22,421 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:22,421 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:22,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:22,427 INFO L85 PathProgramCache]: Analyzing trace with hash 937148507, now seen corresponding path program 1 times [2021-11-25 17:48:22,437 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:22,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859298670] [2021-11-25 17:48:22,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:22,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:22,860 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:22,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [567748400] [2021-11-25 17:48:22,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:22,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:22,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:22,867 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:22,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 17:48:23,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:23,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 2329 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 17:48:23,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:23,850 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 34 proven. 0 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-25 17:48:23,850 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:48:23,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:23,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859298670] [2021-11-25 17:48:23,851 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 17:48:23,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [567748400] [2021-11-25 17:48:23,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [567748400] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:23,852 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:48:23,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-25 17:48:23,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136289767] [2021-11-25 17:48:23,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:23,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 17:48:23,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:23,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 17:48:23,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 17:48:23,892 INFO L87 Difference]: Start difference. First operand has 136 states, 75 states have (on average 1.2) internal successors, (90), 76 states have internal predecessors, (90), 41 states have call successors, (41), 18 states have call predecessors, (41), 18 states have return successors, (41), 41 states have call predecessors, (41), 41 states have call successors, (41) Second operand has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 17:48:24,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:24,478 INFO L93 Difference]: Finished difference Result 242 states and 315 transitions. [2021-11-25 17:48:24,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 17:48:24,481 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) Word has length 99 [2021-11-25 17:48:24,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:24,494 INFO L225 Difference]: With dead ends: 242 [2021-11-25 17:48:24,495 INFO L226 Difference]: Without dead ends: 137 [2021-11-25 17:48:24,500 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:48:24,511 INFO L933 BasicCegarLoop]: 143 mSDtfsCounter, 1 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:24,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 568 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:48:24,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-25 17:48:24,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2021-11-25 17:48:24,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 76 states have (on average 1.1578947368421053) internal successors, (88), 77 states have internal predecessors, (88), 41 states have call successors, (41), 18 states have call predecessors, (41), 19 states have return successors, (41), 41 states have call predecessors, (41), 40 states have call successors, (41) [2021-11-25 17:48:24,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 170 transitions. [2021-11-25 17:48:24,600 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 170 transitions. Word has length 99 [2021-11-25 17:48:24,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:24,602 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 170 transitions. [2021-11-25 17:48:24,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 10.25) internal successors, (41), 5 states have internal predecessors, (41), 2 states have call successors, (25), 2 states have call predecessors, (25), 3 states have return successors, (21), 3 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 17:48:24,602 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 170 transitions. [2021-11-25 17:48:24,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 17:48:24,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:24,615 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:24,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:24,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 17:48:24,831 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:24,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:24,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1808873, now seen corresponding path program 1 times [2021-11-25 17:48:24,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:24,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152648205] [2021-11-25 17:48:24,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:24,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:25,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:25,574 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-25 17:48:25,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:25,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152648205] [2021-11-25 17:48:25,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152648205] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:25,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:48:25,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-25 17:48:25,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175257271] [2021-11-25 17:48:25,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:25,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 17:48:25,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:25,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 17:48:25,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:48:25,581 INFO L87 Difference]: Start difference. First operand 137 states and 170 transitions. Second operand has 8 states, 6 states have (on average 6.833333333333333) internal successors, (41), 5 states have internal predecessors, (41), 3 states have call successors, (26), 4 states have call predecessors, (26), 1 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 17:48:26,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:26,230 INFO L93 Difference]: Finished difference Result 143 states and 175 transitions. [2021-11-25 17:48:26,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 17:48:26,231 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 6.833333333333333) internal successors, (41), 5 states have internal predecessors, (41), 3 states have call successors, (26), 4 states have call predecessors, (26), 1 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 103 [2021-11-25 17:48:26,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:26,234 INFO L225 Difference]: With dead ends: 143 [2021-11-25 17:48:26,234 INFO L226 Difference]: Without dead ends: 141 [2021-11-25 17:48:26,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-25 17:48:26,236 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 17 mSDsluCounter, 933 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 930 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:26,237 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 930 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 207 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 17:48:26,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-11-25 17:48:26,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-11-25 17:48:26,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 79 states have (on average 1.1518987341772151) internal successors, (91), 80 states have internal predecessors, (91), 41 states have call successors, (41), 19 states have call predecessors, (41), 20 states have return successors, (41), 41 states have call predecessors, (41), 40 states have call successors, (41) [2021-11-25 17:48:26,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 173 transitions. [2021-11-25 17:48:26,254 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 173 transitions. Word has length 103 [2021-11-25 17:48:26,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:26,259 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 173 transitions. [2021-11-25 17:48:26,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 6.833333333333333) internal successors, (41), 5 states have internal predecessors, (41), 3 states have call successors, (26), 4 states have call predecessors, (26), 1 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 17:48:26,259 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 173 transitions. [2021-11-25 17:48:26,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-25 17:48:26,261 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:26,262 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:26,262 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 17:48:26,262 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:26,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:26,267 INFO L85 PathProgramCache]: Analyzing trace with hash 2042394318, now seen corresponding path program 1 times [2021-11-25 17:48:26,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:26,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493671564] [2021-11-25 17:48:26,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:26,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:26,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:26,770 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-25 17:48:26,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:26,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493671564] [2021-11-25 17:48:26,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493671564] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:26,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081151837] [2021-11-25 17:48:26,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:26,772 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:26,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:26,773 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:26,798 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 17:48:27,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:27,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 2343 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-25 17:48:27,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:27,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:48:28,381 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:48:28,381 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:48:28,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2081151837] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:28,382 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:48:28,382 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 14 [2021-11-25 17:48:28,382 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599379009] [2021-11-25 17:48:28,382 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:28,383 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 17:48:28,383 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:28,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 17:48:28,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-11-25 17:48:28,384 INFO L87 Difference]: Start difference. First operand 141 states and 173 transitions. Second operand has 9 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 4 states have call successors, (27), 3 states have call predecessors, (27), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-25 17:48:28,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:28,790 INFO L93 Difference]: Finished difference Result 236 states and 290 transitions. [2021-11-25 17:48:28,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 17:48:28,791 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 4 states have call successors, (27), 3 states have call predecessors, (27), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) Word has length 109 [2021-11-25 17:48:28,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:28,793 INFO L225 Difference]: With dead ends: 236 [2021-11-25 17:48:28,793 INFO L226 Difference]: Without dead ends: 143 [2021-11-25 17:48:28,795 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-11-25 17:48:28,796 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 11 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:28,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 752 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 108 Invalid, 0 Unknown, 42 Unchecked, 0.4s Time] [2021-11-25 17:48:28,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-25 17:48:28,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-11-25 17:48:28,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 81 states have (on average 1.1481481481481481) internal successors, (93), 81 states have internal predecessors, (93), 41 states have call successors, (41), 20 states have call predecessors, (41), 20 states have return successors, (41), 41 states have call predecessors, (41), 40 states have call successors, (41) [2021-11-25 17:48:28,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 175 transitions. [2021-11-25 17:48:28,824 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 175 transitions. Word has length 109 [2021-11-25 17:48:28,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:28,824 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 175 transitions. [2021-11-25 17:48:28,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 7.0) internal successors, (49), 7 states have internal predecessors, (49), 4 states have call successors, (27), 3 states have call predecessors, (27), 4 states have return successors, (23), 4 states have call predecessors, (23), 4 states have call successors, (23) [2021-11-25 17:48:28,825 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 175 transitions. [2021-11-25 17:48:28,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-11-25 17:48:28,831 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:28,832 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:28,870 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:29,053 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:29,053 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:29,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:29,054 INFO L85 PathProgramCache]: Analyzing trace with hash 50914174, now seen corresponding path program 1 times [2021-11-25 17:48:29,054 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:29,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125016920] [2021-11-25 17:48:29,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:29,055 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:29,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-25 17:48:29,437 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:29,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125016920] [2021-11-25 17:48:29,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125016920] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:29,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106075036] [2021-11-25 17:48:29,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:29,438 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:29,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:29,439 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:29,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 17:48:29,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:29,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 2367 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-25 17:48:29,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:30,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-11-25 17:48:30,862 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-25 17:48:30,863 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:48:30,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106075036] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:30,863 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:48:30,863 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [11] total 20 [2021-11-25 17:48:30,864 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199828579] [2021-11-25 17:48:30,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:30,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-25 17:48:30,865 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:30,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-25 17:48:30,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:48:30,866 INFO L87 Difference]: Start difference. First operand 143 states and 175 transitions. Second operand has 12 states, 9 states have (on average 5.888888888888889) internal successors, (53), 10 states have internal predecessors, (53), 5 states have call successors, (28), 3 states have call predecessors, (28), 5 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2021-11-25 17:48:31,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:31,254 INFO L93 Difference]: Finished difference Result 242 states and 297 transitions. [2021-11-25 17:48:31,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 17:48:31,255 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 5.888888888888889) internal successors, (53), 10 states have internal predecessors, (53), 5 states have call successors, (28), 3 states have call predecessors, (28), 5 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) Word has length 115 [2021-11-25 17:48:31,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:31,258 INFO L225 Difference]: With dead ends: 242 [2021-11-25 17:48:31,259 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 17:48:31,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2021-11-25 17:48:31,261 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 14 mSDsluCounter, 861 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 155 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:31,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 900 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 155 Unchecked, 0.3s Time] [2021-11-25 17:48:31,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 17:48:31,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2021-11-25 17:48:31,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 states have internal predecessors, (95), 42 states have call successors, (42), 21 states have call predecessors, (42), 20 states have return successors, (42), 41 states have call predecessors, (42), 41 states have call successors, (42) [2021-11-25 17:48:31,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 179 transitions. [2021-11-25 17:48:31,298 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 179 transitions. Word has length 115 [2021-11-25 17:48:31,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:31,299 INFO L470 AbstractCegarLoop]: Abstraction has 146 states and 179 transitions. [2021-11-25 17:48:31,299 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 5.888888888888889) internal successors, (53), 10 states have internal predecessors, (53), 5 states have call successors, (28), 3 states have call predecessors, (28), 5 states have return successors, (24), 5 states have call predecessors, (24), 5 states have call successors, (24) [2021-11-25 17:48:31,299 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 179 transitions. [2021-11-25 17:48:31,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-25 17:48:31,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:31,302 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:31,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:31,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:31,519 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:31,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:31,520 INFO L85 PathProgramCache]: Analyzing trace with hash -996685457, now seen corresponding path program 1 times [2021-11-25 17:48:31,520 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:31,520 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096399179] [2021-11-25 17:48:31,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:31,520 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:31,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:32,752 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-11-25 17:48:32,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:32,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096399179] [2021-11-25 17:48:32,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096399179] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:32,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:48:32,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2021-11-25 17:48:32,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208888454] [2021-11-25 17:48:32,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:32,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-25 17:48:32,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:32,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-25 17:48:32,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=330, Unknown=0, NotChecked=0, Total=380 [2021-11-25 17:48:32,755 INFO L87 Difference]: Start difference. First operand 146 states and 179 transitions. Second operand has 20 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 18 states have internal predecessors, (53), 13 states have call successors, (29), 4 states have call predecessors, (29), 5 states have return successors, (25), 13 states have call predecessors, (25), 13 states have call successors, (25) [2021-11-25 17:48:34,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:34,851 INFO L93 Difference]: Finished difference Result 220 states and 269 transitions. [2021-11-25 17:48:34,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-25 17:48:34,852 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 18 states have internal predecessors, (53), 13 states have call successors, (29), 4 states have call predecessors, (29), 5 states have return successors, (25), 13 states have call predecessors, (25), 13 states have call successors, (25) Word has length 119 [2021-11-25 17:48:34,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:34,854 INFO L225 Difference]: With dead ends: 220 [2021-11-25 17:48:34,854 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 17:48:34,856 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=114, Invalid=756, Unknown=0, NotChecked=0, Total=870 [2021-11-25 17:48:34,856 INFO L933 BasicCegarLoop]: 88 mSDtfsCounter, 176 mSDsluCounter, 352 mSDsCounter, 0 mSdLazyCounter, 1567 mSolverCounterSat, 165 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 1732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 165 IncrementalHoareTripleChecker+Valid, 1567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:34,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [191 Valid, 418 Invalid, 1732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [165 Valid, 1567 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 17:48:34,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 17:48:34,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-11-25 17:48:34,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 84 states have (on average 1.1428571428571428) internal successors, (96), 85 states have internal predecessors, (96), 42 states have call successors, (42), 21 states have call predecessors, (42), 21 states have return successors, (44), 41 states have call predecessors, (44), 41 states have call successors, (44) [2021-11-25 17:48:34,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 182 transitions. [2021-11-25 17:48:34,873 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 182 transitions. Word has length 119 [2021-11-25 17:48:34,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:34,874 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 182 transitions. [2021-11-25 17:48:34,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 3.1176470588235294) internal successors, (53), 18 states have internal predecessors, (53), 13 states have call successors, (29), 4 states have call predecessors, (29), 5 states have return successors, (25), 13 states have call predecessors, (25), 13 states have call successors, (25) [2021-11-25 17:48:34,875 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 182 transitions. [2021-11-25 17:48:34,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 17:48:34,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:34,877 INFO L514 BasicCegarLoop]: trace histogram [10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:34,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 17:48:34,877 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:34,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:34,878 INFO L85 PathProgramCache]: Analyzing trace with hash -813958849, now seen corresponding path program 1 times [2021-11-25 17:48:34,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:34,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007755138] [2021-11-25 17:48:34,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:34,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:35,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:35,145 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2021-11-25 17:48:35,145 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:35,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007755138] [2021-11-25 17:48:35,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007755138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:35,146 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 17:48:35,146 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 17:48:35,146 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280695299] [2021-11-25 17:48:35,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:35,147 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:48:35,147 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:35,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:48:35,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 17:48:35,148 INFO L87 Difference]: Start difference. First operand 148 states and 182 transitions. Second operand has 6 states, 5 states have (on average 11.4) internal successors, (57), 6 states have internal predecessors, (57), 3 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (26), 2 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-25 17:48:35,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:35,618 INFO L93 Difference]: Finished difference Result 224 states and 276 transitions. [2021-11-25 17:48:35,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 17:48:35,618 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 6 states have internal predecessors, (57), 3 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (26), 2 states have call predecessors, (26), 3 states have call successors, (26) Word has length 125 [2021-11-25 17:48:35,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:35,621 INFO L225 Difference]: With dead ends: 224 [2021-11-25 17:48:35,621 INFO L226 Difference]: Without dead ends: 148 [2021-11-25 17:48:35,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:48:35,622 INFO L933 BasicCegarLoop]: 137 mSDtfsCounter, 7 mSDsluCounter, 613 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 664 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:35,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 664 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-25 17:48:35,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-25 17:48:35,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 145. [2021-11-25 17:48:35,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 82 states have (on average 1.1341463414634145) internal successors, (93), 83 states have internal predecessors, (93), 41 states have call successors, (41), 20 states have call predecessors, (41), 21 states have return successors, (43), 41 states have call predecessors, (43), 40 states have call successors, (43) [2021-11-25 17:48:35,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 177 transitions. [2021-11-25 17:48:35,638 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 177 transitions. Word has length 125 [2021-11-25 17:48:35,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:35,639 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 177 transitions. [2021-11-25 17:48:35,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 6 states have internal predecessors, (57), 3 states have call successors, (30), 2 states have call predecessors, (30), 3 states have return successors, (26), 2 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-25 17:48:35,639 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 177 transitions. [2021-11-25 17:48:35,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-25 17:48:35,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:35,641 INFO L514 BasicCegarLoop]: trace histogram [10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:35,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-25 17:48:35,642 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:35,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:35,642 INFO L85 PathProgramCache]: Analyzing trace with hash -1334174738, now seen corresponding path program 1 times [2021-11-25 17:48:35,643 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:35,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092035919] [2021-11-25 17:48:35,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:35,643 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:36,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:36,279 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 4 proven. 7 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2021-11-25 17:48:36,280 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 17:48:36,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092035919] [2021-11-25 17:48:36,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092035919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 17:48:36,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8735225] [2021-11-25 17:48:36,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:36,281 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:36,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:36,282 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:36,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 17:48:36,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:36,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 2449 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-25 17:48:36,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:37,166 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 50 proven. 0 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-25 17:48:37,167 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 17:48:37,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8735225] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 17:48:37,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 17:48:37,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5] total 8 [2021-11-25 17:48:37,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289082527] [2021-11-25 17:48:37,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 17:48:37,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 17:48:37,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 17:48:37,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 17:48:37,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:48:37,170 INFO L87 Difference]: Start difference. First operand 145 states and 177 transitions. Second operand has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 4 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (25), 4 states have call predecessors, (25), 4 states have call successors, (25) [2021-11-25 17:48:37,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 17:48:37,667 INFO L93 Difference]: Finished difference Result 252 states and 308 transitions. [2021-11-25 17:48:37,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 17:48:37,668 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 4 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (25), 4 states have call predecessors, (25), 4 states have call successors, (25) Word has length 129 [2021-11-25 17:48:37,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 17:48:37,670 INFO L225 Difference]: With dead ends: 252 [2021-11-25 17:48:37,670 INFO L226 Difference]: Without dead ends: 145 [2021-11-25 17:48:37,671 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-11-25 17:48:37,672 INFO L933 BasicCegarLoop]: 127 mSDtfsCounter, 15 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 483 SdHoareTripleChecker+Invalid, 175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 17:48:37,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 483 Invalid, 175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 17:48:37,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2021-11-25 17:48:37,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2021-11-25 17:48:37,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 79 states have (on average 1.1265822784810127) internal successors, (89), 80 states have internal predecessors, (89), 41 states have call successors, (41), 20 states have call predecessors, (41), 20 states have return successors, (42), 40 states have call predecessors, (42), 40 states have call successors, (42) [2021-11-25 17:48:37,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2021-11-25 17:48:37,688 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 129 [2021-11-25 17:48:37,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 17:48:37,689 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2021-11-25 17:48:37,689 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.6) internal successors, (53), 6 states have internal predecessors, (53), 4 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (25), 4 states have call predecessors, (25), 4 states have call successors, (25) [2021-11-25 17:48:37,689 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2021-11-25 17:48:37,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-11-25 17:48:37,691 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 17:48:37,692 INFO L514 BasicCegarLoop]: trace histogram [10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 17:48:37,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 17:48:37,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 17:48:37,907 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 17:48:37,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 17:48:37,908 INFO L85 PathProgramCache]: Analyzing trace with hash -1228088085, now seen corresponding path program 1 times [2021-11-25 17:48:37,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 17:48:37,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624673097] [2021-11-25 17:48:37,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:37,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 17:48:38,038 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 17:48:38,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [376019549] [2021-11-25 17:48:38,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 17:48:38,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 17:48:38,041 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 17:48:38,042 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 17:48:38,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7138095b-064c-4003-bde5-3485d9a7efa1/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 17:48:57,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 17:48:57,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 2549 conjuncts, 129 conjunts are in the unsatisfiable core [2021-11-25 17:48:57,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 17:48:57,506 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 13 treesize of output 9 [2021-11-25 17:48:57,588 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 17 treesize of output 9 [2021-11-25 17:48:57,684 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 13 treesize of output 9 [2021-11-25 17:48:58,222 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 32 treesize of output 20 [2021-11-25 17:48:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 59 proven. 3 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-25 17:48:58,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 17:49:00,679 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 34 treesize of output 30 [2021-11-25 17:49:00,980 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 34 treesize of output 30 [2021-11-25 17:49:01,625 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 38 treesize of output 34